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5
.gitignore vendored
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@ -8,7 +8,6 @@
*.bbl *.bbl
*.tdo *.tdo
*.blg *.blg
*.lof
TeX/auto/* TeX/auto/*
main-blx.bib main-blx.bib
@ -16,7 +15,6 @@ main-blx.bib
*.tex~ *.tex~
*#*.tex* *#*.tex*
*~ *~
*#*
# no pdfs # no pdfs
*.pdf *.pdf
@ -26,7 +24,6 @@ main-blx.bib
*.png *.png
*.jpg *.jpg
*.xcf *.xcf
*.gif
# no slurm logs # no slurm logs
*slurm*.out *slurm*.out
@ -34,5 +31,3 @@ main-blx.bib
# no plot data # no plot data
*.csv *.csv
*.mean *.mean
*Plots_*

76
TF/Main.scala
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@ -1,76 +0,0 @@
import breeze.stats.distributions.Uniform
import breeze.stats.distributions.Gaussian
import scala.language.postfixOps
object Activation {
def apply(x: Double): Double = math.max(0, x)
def d(x: Double): Double = if (x > 0) 1 else 0
}
class RSNN(val n: Int, val gamma: Double = 0.001) {
val g = Uniform(-10, 10)
val g_1 = Uniform(-5, 5)//scala.math.exp(1))
val g_3 = Gaussian(0, 5)
val xis = g.sample(n)
val vs = g_3.sample(n)
val bs = xis zip vs map {case(xi, v) => xi * v}
//val vs = g_1.sample(n)
//val bs = g.sample(n)
def computeL1(x: Double) = (bs zip vs) map { case (b, v) => Activation(b + v * x) }
def computeL2(l1: Seq[Double], ws: Seq[Double]): Double =
(l1 zip ws) map { case (l, w) => w * l } sum
def output(ws: Seq[Double])(x: Double): Double = computeL2(computeL1(x), ws)
def learn(data: Seq[(Double, Double)], ws: Seq[Double], lambda: Double, gamma: Double): Seq[Double] = {
// data: N \times 2
// ws: n \times 1
lazy val deltas = data.map {
case (x, y) =>
val l1 = computeL1(x) // n
val out = computeL2(l1, ws) // 1
(l1 zip ws) map {case (l1, w) => (l1 * 2 * (out - y) + lambda * 2 * w) * gamma * -1} // n
}
// deltas: N × n
deltas.foldRight(ws)(
(delta, ws) => // delta: n
ws zip (delta) map { case (w, d) => w + d } // n
)// map (w => w - lambda * gamma * 2 * w)
}
def train(data: Seq[(Double, Double)], iter: Int, lambda: Double, gamma: Double = gamma): (Seq[Double], Double => Double)= {
val ws = (1 to iter).foldRight((1 to n).map(_ => 0.0) :Seq[Double])((i, w) => {
println(s"Training iteration $i")
println(w.sum/w.length)
learn(data, w, lambda, gamma / 10)
})
(ws, output(ws))
}
}
object Main {
def main(args: Array[String]): Unit = {
val nn = new RSNN(10, gamma = 0.0001)
val data = (1 to 100) map (_ * 0.01) map (t => (t, math.sin(t)))
val (ws, evaluate) = nn.train(data, iter = 1000, lambda = 0.8)
val results = data.map(_._1).map(evaluate(_))
data zip results foreach {
println(_)
}
}
}
object EqSeq {
def apply(left: Double, right: Double, steps: Int): Seq[Double] =
(0 to steps) map (_ * (right - left) / steps + left)
}

8
TF/cnn.py
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@ -149,8 +149,8 @@ if __name__ == '__main__':
############################ ############################
# in between layers # in between layers
start_ratio_list = [[0.4, 0.5], [0.4, 0.8], [0.4,0.5], [0.4, 0.8], [0.4, 0.5],[0.4,0.8]] start_ratio_list = [[0.4, 0.5], [0.4, 0.8], [0.4,0.8], [0.4, 0.5], [0.4, 0.8],[0.4,0.8]]
end_ratio_list = [[0.4, 0.5], [0.4, 0.8], [0.4,0.5], [0.4, 0.8], [0.4, 0.5],[0.4,0.8]] end_ratio_list = [[0.4, 0.5], [0.4, 0.8], [0.4,0.8], [0.4, 0.5], [0.4, 0.8],[0.4,0.8]]
patch_size_list = [(3, 3), (3, 3), (2, 2), (3,3), (3, 3), (2, 2)] patch_size_list = [(3, 3), (3, 3), (2, 2), (3,3), (3, 3), (2, 2)]
ind_bgn_list = range(len(patch_size_list)) ind_bgn_list = range(len(patch_size_list))
text_list = ['Conv.', 'Conv.', 'Max-pool.', 'Conv.', 'Conv.', 'Max-pool.'] text_list = ['Conv.', 'Conv.', 'Max-pool.', 'Conv.', 'Conv.', 'Max-pool.']
@ -211,7 +211,7 @@ if __name__ == '__main__':
# plt.show() # plt.show()
fig.set_size_inches(8, 2.5) fig.set_size_inches(8, 2.5)
fig_dir = '/home/tobi/Masterarbeit/TeX/Figures/Data/' fig_dir = '/home/tobi/Masterarbeit/TeX/Plots/Data/'
fig_ext = '.pdf' fig_ext = '.pdf'
fig.savefig(os.path.join(fig_dir, 'cnn_fashion_fig1' + fig_ext), fig.savefig(os.path.join(fig_dir, 'cnn_fashion_fig' + fig_ext),
bbox_inches='tight', pad_inches=0) bbox_inches='tight', pad_inches=0)

52
TF/scratch.scala
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@ -1,52 +0,0 @@
import breeze.plot._
import breeze.plot.DomainFunction._
import breeze.linalg._
import breeze.stats.distributions.Gaussian
val nn = new RSNN(5000, 0.0000001)
val g = Gaussian(0, 0.3)
//val data = EqSeq(-math.Pi, math.Pi, 15) map (t => (t, math.sin(t)+ g.sample(1).last))
val (ws, evaluate) = nn.train(data, iter = 100000, lambda = (1.0/20) / 5 * (nn.n * 8) * 1)
val f = Figure()
val p = f.subplot(0)
val x = linspace(-5, 5)
val y = x.map(evaluate)
//print_data(nn, x, y, 3)
p += plot(x, y)
p += scatter(data.map(_._1), data.map(_._2), x => 0.1)
f.saveas("lines.png")
val x_i = data map {case (x,y) => x}
val y_i = data map {case (x,y) => y}
def print_data(nn: RSNN, x: DenseVector[Double], y: DenseVector[Double], tlambda: Double): Unit = {
val n = nn.n
reflect.io.File("C:/Users/tobia/Documents/Studium/Masterarbeit/Outputs/scala_out_d_1.csv").appendAll(s"x_n_$n"+s"_tl_$tlambda;" + x.toArray.mkString(";") + "\n")
reflect.io.File("C:/Users/tobia/Documents/Studium/Masterarbeit/Outputs/scala_out_d_1.csv").appendAll(s"y_n_$n"+s"_tl_$tlambda;" + y.toArray.mkString(";") + "\n")
}
reflect.io.File("C:/Users/tobia/Documents/Studium/Masterarbeit/Outputs/data_sin_d.csv").appendAll(x_i.mkString(";") + "\n")
reflect.io.File("C:/Users/tobia/Documents/Studium/Masterarbeit/Outputs/data_sin_d.csv").appendAll(y_i.mkString(";") + "\n")
reflect.io.File("C:/Users/tobia/Documents/Studium/Masterarbeit/Outputs/vals1.csv").appendAll(x.toArray.mkString(";") + "\n")
reflect.io.File("C:/Users/tobia/Documents/Studium/Masterarbeit/Outputs/vals1.csv").appendAll(y.toArray.mkString(";") + "\n")
for(j <- List(0.1, 1, 3)) {
for (i <- 3 until 4) {
val nn = new RSNN((5 * math.pow(10, i)).asInstanceOf[Int], 0.0000001)
val (ws, evaluate) = nn.train(data, iter = 100000, lambda = (1.0 / 20) / 5 * (nn.n * 8) * j)
val x = linspace(-5, 5)
val y = x.map(evaluate)
print_data(nn, x, y, j)
}
}
val x_i = Seq(-3.141592653589793,-2.722713633111154,-2.303834612632515,-1.8849555921538759,-1.4660765716752369,-1.0471975511965979,-0.6283185307179586,-0.2094395102393194,0.2094395102393194,0.6283185307179586,1.0471975511965974,1.4660765716752362,1.8849555921538759,2.3038346126325155,2.7227136331111543,3.1415926535897922)
val y_i = Seq(0.0802212608585366,-0.3759376368887911,-1.3264180339054117,-0.8971334213504949,-0.7724344034354425,-0.9501497164520739,-0.6224628757084738,-0.35622668982623207,-0.18377660088356823,0.7836770998126841,0.5874762732054489,1.0696991264956026,1.1297065441952743,0.7587275382323738,-0.030547103790458163,0.044327111895927106)
val data = x_i zip y_i

621
TeX/Appendix_code.tex
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@ -1,621 +0,0 @@
\section{Implementations}
In this section the implementations of the models used are given.
The randomized shallow neural network used in Section~\ref{sec:conv} is
implemented in Scala. No pre-existing frameworks were used to ensure
the implementation was according to the definitions used in Theorem~\ref{theo:main1}.
The neural networks used in Section~\ref{sec:cnn} are implemented in Python using
the Keras framework given in TensorFlow. TensorFlow is a library
containing highly efficient GPU implementations of a wide variety of
tensor operations and algorithms
for training neural networks.% (computing derivatives, updating parameters).
\vspace*{-0.5cm}
\begin{lstfloat}
\begin{lstlisting}[language=iPython]
import breeze.stats.distributions.Uniform
import breeze.stats.distributions.Gaussian
import scala.language.postfixOps
object Activation {
def apply(x: Double): Double = math.max(0, x)
def d(x: Double): Double = if (x > 0) 1 else 0
}
class RSNN(val n: Int, val gamma: Double = 0.001) {
val g_unif = Uniform(-10, 10)
val g_gauss = Gaussian(0, 5)
val xis = g_unif.sample(n)
val vs = g_gauss.sample(n)
val bs = xis zip vs map {case(xi, v) => xi * v}
def computeL1(x: Double) = (bs zip vs) map {
case (b, v) => Activation(b + v * x) }
def computeL2(l1: Seq[Double], ws: Seq[Double]): Double =
(l1 zip ws) map { case (l, w) => w * l } sum
def output(ws: Seq[Double])(x: Double): Double =
computeL2(computeL1(x), ws)
def learn(data: Seq[(Double, Double)], ws: Seq[Double],
lamb: Double, gamma: Double): Seq[Double] = {
lazy val deltas = data.map {
case (x, y) =>
val l1 = computeL1(x)
val out = computeL2(l1, ws)
(l1 zip ws) map {case (l1, w) => (l1 * 2 * (out - y) +
lam * 2 * w) * gamma * -1}
}
deltas.foldRight(ws)(
(delta, ws) => ws zip (delta) map { case (w, d) => w + d })
}
def train(data: Seq[(Double, Double)], iter: Int, lam: Double,
gamma: Double = gamma): (Seq[Double], Double => Double) = {
val ws = (1 to iter).foldRight((1 to n).map(
_ => 0.0) :Seq[Double])((i, w) => {
println(s"Training iteration $i")
println(w.sum/w.length)
learn(data, w, lam, gamma / 10)
})
(ws, output(ws))
}
}
\end{lstlisting}
\caption{Scala code used to build and train the ridge penalized
randomized shallow neural network in Section~\ref{sec:rsnn_sim}.}
% The parameter \textit{lam}
% in the train function represents the $\lambda$ parameter in the error
% function. The parameters \textit{n} and \textit{gamma} set the number
% of hidden nodes and the stepsize for training.}
\label{lst:rsnn}
\end{lstfloat}
\clearpage
\begin{lstfloat}
\begin{lstlisting}[language=iPython]
import tensorflow as tf
import numpy as np
from tensorflow.keras.callbacks import CSVLogger
from tensorflow.keras.preprocessing.image import ImageDataGenerator
mnist = tf.keras.datasets.mnist
(x_train, y_train), (x_test, y_test) = mnist.load_data()
x_train = x_train.reshape(x_train.shape[0], 28, 28, 1)
x_train = x_train / 255.0
x_test = x_test.reshape(x_test.shape[0], 28, 28, 1)
x_test = x_test / 255.0
y_train = tf.keras.utils.to_categorical(y_train)
y_test = tf.keras.utils.to_categorical(y_test)
model = tf.keras.models.Sequential()
model.add(tf.keras.layers.Conv2D(24,kernel_size=5,padding='same',
activation='relu',input_shape=(28,28,1)))
model.add(tf.keras.layers.MaxPool2D())
model.add(tf.keras.layers.Conv2D(64,kernel_size=5,padding='same',
activation='relu'))
model.add(tf.keras.layers.MaxPool2D(padding='same'))
model.add(tf.keras.layers.Flatten())
model.add(tf.keras.layers.Dense(256, activation='relu'))
model.add(tf.keras.layers.Dropout(0.2))
model.add(tf.keras.layers.Dense(10, activation='softmax'))
model.compile(optimizer='adam', loss="categorical_crossentropy",
metrics=["accuracy"])
datagen = ImageDataGenerator(
rotation_range = 30,
zoom_range = 0.15,
width_shift_range=2,
height_shift_range=2,
shear_range = 1)
csv_logger = CSVLogger(<Target File>)
history = model.fit(datagen.flow(x_train, y_train, batch_size=50),
validation_data=(x_test, y_test),
epochs=125, callbacks=[csv_logger],
steps_per_epoch = x_train.shape[0]//50)
\end{lstlisting}
\caption{Python code used to build the network modeling the MNIST
handwritten digits data set.}
\label{lst:handwriting}
\end{lstfloat}
\clearpage
\begin{lstfloat}
\begin{lstlisting}[language=iPython]
import tensorflow as tf
import numpy as np
from tensorflow.keras.callbacks import CSVLogger
from tensorflow.keras.preprocessing.image import ImageDataGenerator
mnist = tf.keras.datasets.fashion_mnist
(x_train, y_train), (x_test, y_test) = mnist.load_data()
x_train = x_train.reshape(x_train.shape[0], 28, 28, 1)
x_test = x_test.reshape(x_test.shape[0], 28, 28, 1)
x_train, x_test = x_train / 255.0, x_test / 255.0
y_train = tf.keras.utils.to_categorical(y_train)
y_test = tf.keras.utils.to_categorical(y_test)
model = tf.keras.Sequential()
model.add(tf.keras.layers.Conv2D(filters = 32, kernel_size = (3, 3),
activation='relu', input_shape = (28, 28, 1), padding='same'))
model.add(tf.keras.layers.Conv2D(filters = 32, kernel_size = (2, 2), activation='relu', padding = 'same'))
model.add(tf.keras.layers.MaxPool2D(strides=(2,2)))
model.add(tf.keras.layers.Conv2D(filters = 64, kernel_size = (3, 3), activation='relu', padding='same'))
model.add(tf.keras.layers.Conv2D(filters = 64, kernel_size = (3, 3), activation='relu', padding='same'))
model.add(tf.keras.layers.MaxPool2D(strides=(2,2)))
model.add(tf.keras.layers.Flatten())
model.add(tf.keras.layers.Dense(256, activation='relu'))
model.add(tf.keras.layers.Dropout(0.2))
model.add(tf.keras.layers.Dense(10, activation='softmax'))
model.compile(optimizer=tf.keras.optimizers.Adam(lr = 1e-3), loss="categorical_crossentropy", metrics=["accuracy"])
datagen = ImageDataGenerator(
rotation_range = 6,
zoom_range = 0.15,
width_shift_range=2,
height_shift_range=2,
shear_range = 0.15,
fill_mode = 'constant',
cval = 0)
csv_logger = CSVLogger(<Target File>)
history = model.fit(datagen.flow(x_train, y_train, batch_size=30),
steps_per_epoch=x_train.shape[0]//30,
validation_data=(x_test, y_test),
epochs=125, callbacks=[csv_logger],
shuffle=True)
\end{lstlisting}
\caption[Python Code for fashion MNIST]{Python code
used to build the network modeling the fashion MNIST data set.}
\label{lst:fashion}
\end{lstfloat}
\clearpage
\begin{lstfloat}
\begin{lstlisting}[language=iPython]
def get_random_sample(a, b, number_of_samples=10):
x = []
y = []
for category_number in range(0,10):
# get all samples of a category
train_data_category = a[b==category_number]
# pick a number of random samples from the category
train_data_category = train_data_category[np.random.randint(
train_data_category.shape[0], size=number_of_samples), :]
x.extend(train_data_category)
y.append([category_number]*number_of_samples)
return (np.asarray(x).reshape(-1, 28, 28, 1),
np.asarray(y).reshape(10*number_of_samples,1))
\end{lstlisting}
\caption{Python code used to generate the data sets containing a
certain amount of random data points per class.}
\end{lstfloat}
\section{Additional Comparisons}
\label{app:comp}
In this section, comparisons of cross entropy loss and training
accuracy for the models trained in Section~\ref{sec:smalldata} are given.
\begin{figure}[h]
\centering
\small
\begin{subfigure}[h]{\textwidth}
\begin{tikzpicture}
\begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed,
/pgf/number format/precision=3},tick style = {draw = none}, width = \textwidth,
height = 0.4\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east},
xlabel = {Epoch},ylabel = {Test Loss}, cycle
list/Dark2, every axis plot/.append style={line width
=1.25pt}]
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/adam_1.mean};
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/adam_dropout_02_1.mean};
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/adam_datagen_1.mean};
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/adam_datagen_dropout_02_1.mean};
\addlegendentry{\footnotesize{Default}}
\addlegendentry{\footnotesize{D. 0.2}}
\addlegendentry{\footnotesize{G.}}
\addlegendentry{\footnotesize{G. + D. 0.2}}
\addlegendentry{\footnotesize{D. 0.4}}
\addlegendentry{\footnotesize{Default}}
\end{axis}
\end{tikzpicture}
\caption{1 Sample per Class}
\vspace{0.25cm}
\end{subfigure}
\begin{subfigure}[h]{\textwidth}
\begin{tikzpicture}
\begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed,
/pgf/number format/precision=3},tick style = {draw = none}, width = \textwidth,
height = 0.4\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east},
xlabel = {Epoch},ylabel = {Test Loss}, cycle
list/Dark2, every axis plot/.append style={line width
=1.25pt}]
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/adam_dropout_00_10.mean};
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/adam_dropout_02_10.mean};
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/adam_datagen_dropout_00_10.mean};
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/adam_datagen_dropout_02_10.mean};
\addlegendentry{\footnotesize{Default.}}
\addlegendentry{\footnotesize{D. 0.2}}
\addlegendentry{\footnotesize{G.}}
\addlegendentry{\footnotesize{G + D. 0.2}}
\end{axis}
\end{tikzpicture}
\caption{10 Samples per Class}
\end{subfigure}
\begin{subfigure}[h]{\textwidth}
\begin{tikzpicture}
\begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed,
/pgf/number format/precision=3},tick style = {draw = none}, width = 0.9875\textwidth,
height = 0.4\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east},
xlabel = {Epoch}, ylabel = {Test Loss}, cycle
list/Dark2, every axis plot/.append style={line width
=1.25pt}]
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/adam_dropout_00_100.mean};
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/adam_dropout_02_100.mean};
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/adam_datagen_dropout_00_100.mean};
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/adam_datagen_dropout_02_100.mean};
\addlegendentry{\footnotesize{Default.}}
\addlegendentry{\footnotesize{D. 0.2}}
\addlegendentry{\footnotesize{G.}}
\addlegendentry{\footnotesize{G + D. 0.2}}
\end{axis}
\end{tikzpicture}
\caption{100 Samples per Class}
\vspace{.25cm}
\end{subfigure}
\caption[Mean Test Loss for Subsets of MNIST Handwritten
Digits]{Mean test cross entropy loss of the models fitting the
sampled subsets of MNIST
handwritten digits over the 125 epochs of training.}
\end{figure}
\begin{figure}[h]
\centering
\small
\begin{subfigure}[h]{\textwidth}
\begin{tikzpicture}
\begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed,
/pgf/number format/precision=3},tick style =
{draw = none}, width = \textwidth,
height = 0.4\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east},
xlabel = {Epoch},ylabel = {Test Loss}, cycle
list/Dark2, every axis plot/.append style={line width
=1.25pt}]
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/fashion_dropout_0_1.mean};
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/fashion_dropout_2_1.mean};
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/fashion_datagen_dropout_0_1.mean};
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/fashion_datagen_dropout_2_1.mean};
\addlegendentry{\footnotesize{Default}}
\addlegendentry{\footnotesize{D. 0.2}}
\addlegendentry{\footnotesize{G.}}
\addlegendentry{\footnotesize{G. + D. 0.2}}
\addlegendentry{\footnotesize{D. 0.4}}
\end{axis}
\end{tikzpicture}
\caption{1 Sample per Class}
\vspace{0.25cm}
\end{subfigure}
\begin{subfigure}[h]{\textwidth}
\begin{tikzpicture}
\begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed,
/pgf/number format/precision=3},tick style = {draw = none}, width = \textwidth,
height = 0.4\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east},
xlabel = {Epoch},ylabel = {Test Loss}, cycle
list/Dark2, every axis plot/.append style={line width
=1.25pt}, ymin = {0.62}]
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/fashion_dropout_0_10.mean};
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/fashion_dropout_2_10.mean};
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/fashion_datagen_dropout_0_10.mean};
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/fashion_datagen_dropout_2_10.mean};
\addlegendentry{\footnotesize{Default.}}
\addlegendentry{\footnotesize{D. 0.2}}
\addlegendentry{\footnotesize{G.}}
\addlegendentry{\footnotesize{G + D. 0.2}}
\end{axis}
\end{tikzpicture}
\caption{10 Samples per Class}
\end{subfigure}
\begin{subfigure}[h]{\textwidth}
\begin{tikzpicture}
\begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed,
/pgf/number format/precision=3},tick style = {draw = none}, width = 0.9875\textwidth,
height = 0.4\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east},
xlabel = {Epoch}, ylabel = {Test Loss}, cycle
list/Dark2, every axis plot/.append style={line width
=1.25pt}]
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/fashion_dropout_0_100.mean};
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/fashion_dropout_2_100.mean};
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/fashion_datagen_dropout_0_100.mean};
\addplot table
[x=epoch, y=val_loss, col sep=comma, mark = none]
{Figures/Data/fashion_datagen_dropout_2_100.mean};
\addlegendentry{\footnotesize{Default.}}
\addlegendentry{\footnotesize{D. 0.2}}
\addlegendentry{\footnotesize{G.}}
\addlegendentry{\footnotesize{G + D. 0.2}}
\end{axis}
\end{tikzpicture}
\caption{100 Samples per Class}
\vspace{.25cm}
\end{subfigure}
\caption[Mean Test Accuracies for Subsets of Fashion MNIST]{Mean
test cross entropy loss of the models fitting the sampled subsets
of fashion MNIST
over the 125 epochs of training.}
\end{figure}
\begin{figure}[h]
\centering
\small
\begin{subfigure}[h]{\textwidth}
\begin{tikzpicture}
\begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed,
/pgf/number format/precision=3},tick style = {draw = none}, width = \textwidth,
height = 0.4\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east},
xlabel = {Epoch},ylabel = {Training Accuracy}, cycle
list/Dark2, every axis plot/.append style={line width
=1.25pt}]
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/adam_1.mean};
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/adam_dropout_02_1.mean};
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/adam_datagen_1.mean};
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/adam_datagen_dropout_02_1.mean};
\addlegendentry{\footnotesize{Default}}
\addlegendentry{\footnotesize{D. 0.2}}
\addlegendentry{\footnotesize{G.}}
\addlegendentry{\footnotesize{G. + D. 0.2}}
\addlegendentry{\footnotesize{D. 0.4}}
\addlegendentry{\footnotesize{Default}}
\end{axis}
\end{tikzpicture}
\caption{1 Sample per Class}
\vspace{0.25cm}
\end{subfigure}
\begin{subfigure}[h]{\textwidth}
\begin{tikzpicture}
\begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed,
/pgf/number format/precision=3},tick style = {draw = none}, width = \textwidth,
height = 0.4\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east},
xlabel = {Epoch},ylabel = {Test Accuracy}, cycle
list/Dark2, every axis plot/.append style={line width
=1.25pt}]
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/adam_dropout_00_10.mean};
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/adam_dropout_02_10.mean};
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/adam_datagen_dropout_00_10.mean};
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/adam_datagen_dropout_02_10.mean};
\addlegendentry{\footnotesize{Default.}}
\addlegendentry{\footnotesize{D. 0.2}}
\addlegendentry{\footnotesize{G.}}
\addlegendentry{\footnotesize{G + D. 0.2}}
\end{axis}
\end{tikzpicture}
\caption{10 Samples per Class}
\end{subfigure}
\begin{subfigure}[h]{\textwidth}
\begin{tikzpicture}
\begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed,
/pgf/number format/precision=3},tick style = {draw = none}, width = 0.9875\textwidth,
height = 0.4\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east},
xlabel = {Epoch}, ylabel = {Training Accuracy}, cycle
list/Dark2, every axis plot/.append style={line width
=1.25pt}, ymin = {0.92}]
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/adam_dropout_00_100.mean};
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/adam_dropout_02_100.mean};
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/adam_datagen_dropout_00_100.mean};
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/adam_datagen_dropout_02_100.mean};
\addlegendentry{\footnotesize{Default.}}
\addlegendentry{\footnotesize{D. 0.2}}
\addlegendentry{\footnotesize{G.}}
\addlegendentry{\footnotesize{G + D. 0.2}}
\end{axis}
\end{tikzpicture}
\caption{100 Samples per Class}
\vspace{.25cm}
\end{subfigure}
\caption[Mean Training Accuracies for Subsets of MNIST Handwritten
Digits]{Mean training accuracies of the models fitting the sampled
subsets of MNIST
handwritten digits over the 125 epochs of training.}
\end{figure}
\begin{figure}[h]
\centering
\small
\begin{subfigure}[h]{\textwidth}
\begin{tikzpicture}
\begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed,
/pgf/number format/precision=3},tick style =
{draw = none}, width = \textwidth,
height = 0.4\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east},
xlabel = {Epoch},ylabel = {Training Accuracy}, cycle
list/Dark2, every axis plot/.append style={line width
=1.25pt}]
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/fashion_dropout_0_1.mean};
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/fashion_dropout_2_1.mean};
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/fashion_datagen_dropout_0_1.mean};
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/fashion_datagen_dropout_2_1.mean};
\addlegendentry{\footnotesize{Default}}
\addlegendentry{\footnotesize{D. 0.2}}
\addlegendentry{\footnotesize{G.}}
\addlegendentry{\footnotesize{G. + D. 0.2}}
\addlegendentry{\footnotesize{D. 0.4}}
\end{axis}
\end{tikzpicture}
\caption{1 Sample per Class}
\vspace{0.25cm}
\end{subfigure}
\begin{subfigure}[h]{\textwidth}
\begin{tikzpicture}
\begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed,
/pgf/number format/precision=3},tick style = {draw = none}, width = \textwidth,
height = 0.4\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east},
xlabel = {Epoch},ylabel = {Training Accuracy}, cycle
list/Dark2, every axis plot/.append style={line width
=1.25pt}, ymin = {0.62}]
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/fashion_dropout_0_10.mean};
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/fashion_dropout_2_10.mean};
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/fashion_datagen_dropout_0_10.mean};
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/fashion_datagen_dropout_2_10.mean};
\addlegendentry{\footnotesize{Default.}}
\addlegendentry{\footnotesize{D. 0.2}}
\addlegendentry{\footnotesize{G.}}
\addlegendentry{\footnotesize{G + D. 0.2}}
\end{axis}
\end{tikzpicture}
\caption{10 Samples per Class}
\end{subfigure}
\begin{subfigure}[h]{\textwidth}
\begin{tikzpicture}
\begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed,
/pgf/number format/precision=3},tick style = {draw = none}, width = 0.9875\textwidth,
height = 0.4\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east},
xlabel = {Epoch}, ylabel = {Training Accuracy}, cycle
list/Dark2, every axis plot/.append style={line width
=1.25pt}]
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/fashion_dropout_0_100.mean};
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/fashion_dropout_2_100.mean};
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/fashion_datagen_dropout_0_100.mean};
\addplot table
[x=epoch, y=accuracy, col sep=comma, mark = none]
{Figures/Data/fashion_datagen_dropout_2_100.mean};
\addlegendentry{\footnotesize{Default.}}
\addlegendentry{\footnotesize{D. 0.2}}
\addlegendentry{\footnotesize{G.}}
\addlegendentry{\footnotesize{G + D. 0.2}}
\end{axis}
\end{tikzpicture}
\caption{100 Samples per Class}
\vspace{.25cm}
\end{subfigure}
\caption[Mean Training Accuracies for Subsets of Fashion MNIST]{Mean
training accuracies of the models fitting the sampled subsets of fashion MNIST
over the 125 epochs of training.}
\end{figure}
%%% Local Variables:
%%% mode: latex
%%% TeX-master: "main"
%%% End:

27
TeX/Figures/RN_vs_RS.tex
View File

@ -10,14 +10,13 @@ plot coordinates {
} }
} }
\begin{figure} \begin{figure}
\begin{subfigure}[b]{0.48\textwidth} \begin{subfigure}[b]{0.5\textwidth}
\begin{subfigure}[b]{\textwidth} \begin{subfigure}[b]{\textwidth}
\begin{adjustbox}{width=\textwidth, height=0.25\textheight} \begin{adjustbox}{width=\textwidth, height=0.25\textheight}
\begin{tikzpicture} \begin{tikzpicture}
\begin{axis}[ \begin{axis}[
ytick = {-1, 0, 1, 2}, ytick = {-1, 0, 1, 2},
yticklabels = {$-1$, $\phantom{-0.}0$, $1$, $2$}, yticklabels = {$-1$, $\phantom{-0.}0$, $1$, $2$},]
restrict x to domain=-4:4, enlarge x limits = {0.1}]
\addplot table [x=x, y=y, col sep=comma, only marks, \addplot table [x=x, y=y, col sep=comma, only marks,
forget plot] {Figures/Data/sin_6.csv}; forget plot] {Figures/Data/sin_6.csv};
\addplot [black, line width=2pt] table [x=x, y=y, col \addplot [black, line width=2pt] table [x=x, y=y, col
@ -34,7 +33,7 @@ plot coordinates {
\begin{subfigure}[b]{\textwidth} \begin{subfigure}[b]{\textwidth}
\begin{adjustbox}{width=\textwidth, height=0.25\textheight} \begin{adjustbox}{width=\textwidth, height=0.25\textheight}
\begin{tikzpicture} \begin{tikzpicture}
\begin{axis}[restrict x to domain=-4:4, enlarge x limits = {0.1}] \begin{axis}
\addplot table [x=x, y=y, col sep=comma, only marks, \addplot table [x=x, y=y, col sep=comma, only marks,
forget plot] {Figures/Data/sin_6.csv}; forget plot] {Figures/Data/sin_6.csv};
\addplot [black, line width=2pt] table [x=x, y=y, col sep=comma, mark=none] {Figures/Data/matlab_1.csv}; \addplot [black, line width=2pt] table [x=x, y=y, col sep=comma, mark=none] {Figures/Data/matlab_1.csv};
@ -50,7 +49,7 @@ plot coordinates {
\begin{subfigure}[b]{\textwidth} \begin{subfigure}[b]{\textwidth}
\begin{adjustbox}{width=\textwidth, height=0.25\textheight} \begin{adjustbox}{width=\textwidth, height=0.25\textheight}
\begin{tikzpicture} \begin{tikzpicture}
\begin{axis}[restrict x to domain=-4:4, enlarge x limits = {0.1}] \begin{axis}
\addplot table [x=x, y=y, col sep=comma, only marks, \addplot table [x=x, y=y, col sep=comma, only marks,
forget plot] {Figures/Data/sin_6.csv}; forget plot] {Figures/Data/sin_6.csv};
\addplot [black, line width=2pt] table [x=x, y=y, col sep=comma, mark=none] {Figures/Data/matlab_3.csv}; \addplot [black, line width=2pt] table [x=x, y=y, col sep=comma, mark=none] {Figures/Data/matlab_3.csv};
@ -64,14 +63,13 @@ plot coordinates {
\caption{$\lambda = 3.0$} \caption{$\lambda = 3.0$}
\end{subfigure} \end{subfigure}
\end{subfigure} \end{subfigure}
\begin{subfigure}[b]{0.48\textwidth} \begin{subfigure}[b]{0.5\textwidth}
\begin{subfigure}[b]{\textwidth} \begin{subfigure}[b]{\textwidth}
\begin{adjustbox}{width=\textwidth, height=0.245\textheight} \begin{adjustbox}{width=\textwidth, height=0.245\textheight}
\begin{tikzpicture} \begin{tikzpicture}
\begin{axis}[ \begin{axis}[
ytick = {-2,-1, 0, 1, 2}, ytick = {-2,-1, 0, 1, 2},
yticklabels = {$-2$,$-1$, $\phantom{-0.}0$, $1$, $2$}, yticklabels = {$-2$,$-1$, $\phantom{-0.}0$, $1$, $2$},]
restrict x to domain=-4:4, enlarge x limits = {0.1}]
\addplot table [x=x, y=y, col sep=comma, only marks, \addplot table [x=x, y=y, col sep=comma, only marks,
forget plot] {Figures/Data/data_sin_d_t.csv}; forget plot] {Figures/Data/data_sin_d_t.csv};
\addplot [black, line width=2pt] table [x=x, y=y, col sep=comma, mark=none] {Figures/Data/matlab_sin_d_01.csv}; \addplot [black, line width=2pt] table [x=x, y=y, col sep=comma, mark=none] {Figures/Data/matlab_sin_d_01.csv};
@ -87,7 +85,7 @@ plot coordinates {
\begin{subfigure}[b]{\textwidth} \begin{subfigure}[b]{\textwidth}
\begin{adjustbox}{width=\textwidth, height=0.25\textheight} \begin{adjustbox}{width=\textwidth, height=0.25\textheight}
\begin{tikzpicture} \begin{tikzpicture}
\begin{axis}[restrict x to domain=-4:4, enlarge x limits = {0.1}] \begin{axis}
\addplot table [x=x, y=y, col sep=comma, only marks, \addplot table [x=x, y=y, col sep=comma, only marks,
forget plot] {Figures/Data/data_sin_d_t.csv}; forget plot] {Figures/Data/data_sin_d_t.csv};
\addplot [black, line width=2pt] table [x=x, y=y, col sep=comma, mark=none] {Figures/Data/matlab_sin_d_1.csv}; \addplot [black, line width=2pt] table [x=x, y=y, col sep=comma, mark=none] {Figures/Data/matlab_sin_d_1.csv};
@ -103,7 +101,7 @@ plot coordinates {
\begin{subfigure}[b]{\textwidth} \begin{subfigure}[b]{\textwidth}
\begin{adjustbox}{width=\textwidth, height=0.25\textheight} \begin{adjustbox}{width=\textwidth, height=0.25\textheight}
\begin{tikzpicture} \begin{tikzpicture}
\begin{axis}[restrict x to domain=-4:4, enlarge x limits = {0.1}] \begin{axis}
\addplot table [x=x, y=y, col sep=comma, only marks, \addplot table [x=x, y=y, col sep=comma, only marks,
forget plot] {Figures/Data/data_sin_d_t.csv}; forget plot] {Figures/Data/data_sin_d_t.csv};
\addplot [black, line width=2pt] table [x=x, y=y, col sep=comma, mark=none] {Figures/Data/matlab_sin_d_3.csv}; \addplot [black, line width=2pt] table [x=x, y=y, col sep=comma, mark=none] {Figures/Data/matlab_sin_d_3.csv};
@ -117,8 +115,8 @@ plot coordinates {
\caption{$\lambda = 3.0$} \caption{$\lambda = 3.0$}
\end{subfigure} \end{subfigure}
\end{subfigure} \end{subfigure}
\caption[Comparison of Shallow Neural Networks and Regression \caption[Comparison of shallow neural networks and regression
Splines] {% In these Figures the behaviour stated in ... is splines]{% In these Figures the behaviour stated in ... is
% visualized % visualized
% in two exaples. For $(a), (b), (c)$ six values of sinus equidistantly % in two exaples. For $(a), (b), (c)$ six values of sinus equidistantly
% spaced on $[-\pi, \pi]$ have been used as training data. For % spaced on $[-\pi, \pi]$ have been used as training data. For
@ -133,12 +131,11 @@ plot coordinates {
Ridge Penalized Neural Network compared to Regression Spline, Ridge Penalized Neural Network compared to Regression Spline,
with them being trained on $\text{data}_A$ in a), b), c) and on with them being trained on $\text{data}_A$ in a), b), c) and on
$\text{data}_B$ in d), e), f). $\text{data}_B$ in d), e), f).
The Parameters of each are given above. The implementation of the The Parameters of each are given above.
network in Scala is given in Listing~\ref{lst:rsnn}
} }
\label{fig:rn_vs_rs} \label{fig:rn_vs_rs}
\end{figure} \end{figure}
%%% Local Variables: %%% Local Variables:
%%% mode: latex %%% mode: latex
%%% TeX-master: "main" %%% TeX-master:
%%% End: %%% End:

116
TeX/Figures/SGD_vs_GD.tex
View File

@ -4,32 +4,28 @@ legend image code/.code={
\draw[mark repeat=2,mark phase=2] \draw[mark repeat=2,mark phase=2]
plot coordinates { plot coordinates {
(0cm,0cm) (0cm,0cm)
(0.15cm,0cm) %% default is (0.3cm,0cm) (0.0cm,0cm) %% default is (0.3cm,0cm)
(0.3cm,0cm) %% default is (0.6cm,0cm) (0.0cm,0cm) %% default is (0.6cm,0cm)
};% };%
} }
} }
\begin{figure} \begin{figure}
\begin{subfigure}[h!]{\textwidth} \begin{subfigure}[h!]{\textwidth}
\begin{tikzpicture} \begin{tikzpicture}
\begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed, \begin{axis}[tick style = {draw = none}, width = \textwidth,
/pgf/number format/precision=3},tick style = {draw = none}, width = 0.975\textwidth, height = 0.6\textwidth,
height = 0.6\textwidth, legend
style={at={(0.0125,0.7)},anchor=north west},
xlabel = {Epoch}, ylabel = {Test Accuracy}, cycle
list/Dark2, every axis plot/.append style={line width
=1.25pt, mark = *, mark size=1pt},
xtick = {1, 3, 5,7,9,11,13,15,17,19}, xtick = {1, 3, 5,7,9,11,13,15,17,19},
xticklabels = {$2$, $4$, $6$, $8$, xticklabels = {$2$, $4$, $6$, $8$,
$10$,$12$,$14$,$16$,$18$,$20$}] $10$,$12$,$14$,$16$,$18$,$20$},
xlabel = {training epoch}, ylabel = {classification accuracy}]
\addplot table \addplot table
[x=epoch, y=val_accuracy, col sep=comma] {Figures/Data/GD_01.log}; [x=epoch, y=val_accuracy, col sep=comma] {Figures/Data/GD_01.log};
\addplot table \addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = *] {Figures/Data/GD_05.log}; [x=epoch, y=val_accuracy, col sep=comma] {Figures/Data/GD_05.log};
\addplot table \addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = *] {Figures/Data/GD_1.log}; [x=epoch, y=val_accuracy, col sep=comma] {Figures/Data/GD_1.log};
\addplot table \addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = *] [x=epoch, y=val_accuracy, col sep=comma]
{Figures/Data/SGD_01_b32.log}; {Figures/Data/SGD_01_b32.log};
\addlegendentry{GD$_{0.01}$} \addlegendentry{GD$_{0.01}$}
@ -38,65 +34,59 @@ plot coordinates {
\addlegendentry{SGD$_{0.01}$} \addlegendentry{SGD$_{0.01}$}
\end{axis} \end{axis}
\end{tikzpicture} \end{tikzpicture}
\caption{Test accuracy during training.} %\caption{Classification accuracy}
\end{subfigure} \end{subfigure}
% \begin{subfigure}[b]{\textwidth} \begin{subfigure}[b]{\textwidth}
% \begin{tikzpicture} \begin{tikzpicture}
% \begin{axis}[tick style = {draw = none}, width = \textwidth, \begin{axis}[tick style = {draw = none}, width = \textwidth,
% height = 0.6\textwidth, height = 0.6\textwidth,
% ytick = {0, 1, 2, 3, 4}, ytick = {0, 1, 2, 3, 4},
% yticklabels = {$0$, $1$, $\phantom{0.}2$, $3$, $4$}, yticklabels = {$0$, $1$, $\phantom{0.}2$, $3$, $4$},
% xtick = {1, 3, 5,7,9,11,13,15,17,19}, xtick = {1, 3, 5,7,9,11,13,15,17,19},
% xticklabels = {$2$, $4$, $6$, $8$, xticklabels = {$2$, $4$, $6$, $8$,
% $10$,$12$,$14$,$16$,$18$,$20$}, $10$,$12$,$14$,$16$,$18$,$20$},
% xlabel = {training epoch}, ylabel = {error measure\vphantom{fy}}] xlabel = {training epoch}, ylabel = {error measure\vphantom{fy}}]
% \addplot table \addplot table
% [x=epoch, y=val_loss, col sep=comma] {Figures/Data/GD_01.log}; [x=epoch, y=val_loss, col sep=comma] {Figures/Data/GD_01.log};
% \addplot table \addplot table
% [x=epoch, y=val_loss, col sep=comma] {Figures/Data/GD_05.log}; [x=epoch, y=val_loss, col sep=comma] {Figures/Data/GD_05.log};
% \addplot table \addplot table
% [x=epoch, y=val_loss, col sep=comma] {Figures/Data/GD_1.log}; [x=epoch, y=val_loss, col sep=comma] {Figures/Data/GD_1.log};
% \addplot table \addplot table
% [x=epoch, y=val_loss, col sep=comma] {Figures/Data/SGD_01_b32.log}; [x=epoch, y=val_loss, col sep=comma] {Figures/Data/SGD_01_b32.log};
% \addlegendentry{GD$_{0.01}$} \addlegendentry{GD$_{0.01}$}
% \addlegendentry{GD$_{0.05}$} \addlegendentry{GD$_{0.05}$}
% \addlegendentry{GD$_{0.1}$} \addlegendentry{GD$_{0.1}$}
% \addlegendentry{SGD$_{0.01}$} \addlegendentry{SGD$_{0.01}$}
% \end{axis} \end{axis}
% \end{tikzpicture} \end{tikzpicture}
% \caption{Performance metrics during training} \caption{Performance metrics during training}
% \end{subfigure} \end{subfigure}
% \\~\\ % \\~\\
\caption[Performance comparison of SDG and GD]{The neural network given in ?? trained with different
\begin{subfigure}[b]{1.0\linewidth}
\begin{tabu} to \textwidth {@{} *4{X[c]}c*4{X[c]} @{}}
\multicolumn{4}{c}{Test Accuracy}
&~&\multicolumn{4}{c}{Test Loss}
\\\cline{1-4}\cline{6-9}
GD$_{0.01}$&GD$_{0.05}$&GD$_{0.1}$&SGD$_{0.01}$&&GD$_{0.01}$&GD$_{0.05}$&GD$_{0.1}$&SGD$_{0.01}$
\\\cline{1-4}\cline{6-9}
0.265&0.633&0.203&0.989&&2.267&1.947&3.911&0.032 \\
\multicolumn{4}{c}{Training Accuracy}
&~&\multicolumn{4}{c}{Training Loss}
\\\cline{1-4}\cline{6-9}
GD$_{0.01}$&GD$_{0.05}$&GD$_{0.1}$&SGD$_{0.01}$&&GD$_{0.01}$&GD$_{0.05}$&GD$_{0.1}$&SGD$_{0.01}$
\\\cline{1-4}\cline{6-9}
0.250&0.599&0.685&0.996&&2.271&1.995&1.089&0.012 \\
\end{tabu}
\caption{Performance metrics after 20 training epochs.}
\label{table:sgd_vs_gd}
\end{subfigure}
\caption[Performance Comparison of SDG and GD]{The neural network
given in Figure~\ref{fig:mnist_architecture} trained with different
algorithms on the MNIST handwritten digits data set. For gradient algorithms on the MNIST handwritten digits data set. For gradient
descent the learning rated 0.01, 0.05, and 0.1 are (GD$_{\cdot}$). For descent the learning rated 0.01, 0.05 and 0.1 are (GD$_{\cdot}$). For
stochastic gradient descend a batch size of 32 and learning rate stochastic gradient descend a batch size of 32 and learning rate
of 0.01 is used (SDG$_{0.01}$).} of 0.01 is used (SDG$_{0.01}$).}
\label{fig:sgd_vs_gd} \label{fig:sgd_vs_gd}
\end{figure} \end{figure}
\begin{table}[h]
\begin{tabu} to \textwidth {@{} *4{X[c]}c*4{X[c]} @{}}
\multicolumn{4}{c}{Classification Accuracy}
&~&\multicolumn{4}{c}{Error Measure}
\\\cline{1-4}\cline{6-9}
GD$_{0.01}$&GD$_{0.05}$&GD$_{0.1}$&SGD$_{0.01}$&&GD$_{0.01}$&GD$_{0.05}$&GD$_{0.1}$&SGD$_{0.01}$
\\\cline{1-4}\cline{6-9}
\multicolumn{9}{c}{test}\\
0.265&0.633&0.203&0.989&&2.267&1.947&3.91&0.032
\end{tabu}
\caption{Performance metrics of the networks trained in
Figure~\ref{fig:sgd_vs_gd} after 20 training epochs.}
\label{table:sgd_vs_gd}
\end{table}
%%% Local Variables: %%% Local Variables:
%%% mode: latex %%% mode: latex
%%% TeX-master: "../main" %%% TeX-master: "../main"

4
TeX/Figures/fashion_mnist.tex
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@ -40,11 +40,11 @@
\includegraphics[width=\textwidth]{Figures/Data/fashion_mnist9.pdf} \includegraphics[width=\textwidth]{Figures/Data/fashion_mnist9.pdf}
\caption{Ankle boot} \caption{Ankle boot}
\end{subfigure} \end{subfigure}
\caption[Fashion MNIST Data Set]{The fashtion MNIST data set contains 70.000 images of \caption[Fashion MNIST data set]{The fashtion MNIST data set contains 70.000 images of
preprocessed product images from Zalando, which are categorized as preprocessed product images from Zalando, which are categorized as
T-shirt/top, Trouser, Pullover, Dress, Coat, Sandal, Shirt, T-shirt/top, Trouser, Pullover, Dress, Coat, Sandal, Shirt,
Sneaker, Bag, Ankle boot. Of these images 60.000 are used as training images, while Sneaker, Bag, Ankle boot. Of these images 60.000 are used as training images, while
the rest is used to validate the models trained.} the rest are used to validate the models trained.}
\label{fig:fashionMNIST} \label{fig:fashionMNIST}
\end{figure} \end{figure}
%%% Local Variables: %%% Local Variables:

19
TeX/Figures/gen_dropout.tex
View File

@ -16,7 +16,7 @@ plot coordinates {
\begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed, \begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed,
/pgf/number format/precision=3},tick style = {draw = none}, width = 0.975\textwidth, /pgf/number format/precision=3},tick style = {draw = none}, width = 0.975\textwidth,
height = 0.6\textwidth, ymin = 0.988, legend style={at={(0.9825,0.0175)},anchor=south east}, height = 0.6\textwidth, ymin = 0.988, legend style={at={(0.9825,0.0175)},anchor=south east},
xlabel = {Epoch}, ylabel = {Test Accuracy}, cycle xlabel = {epoch}, ylabel = {Classification Accuracy}, cycle
list/Dark2, every axis plot/.append style={line width =1.25pt}] list/Dark2, every axis plot/.append style={line width =1.25pt}]
\addplot table \addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none] [x=epoch, y=val_accuracy, col sep=comma, mark = none]
@ -45,18 +45,18 @@ plot coordinates {
\addlegendentry{\footnotesize{Default}} \addlegendentry{\footnotesize{Default}}
\end{axis} \end{axis}
\end{tikzpicture} \end{tikzpicture}
\caption{Test Accuracy} \caption{Classification accuracy}
\vspace{.25cm} \vspace{.25cm}
\end{subfigure} \end{subfigure}
\begin{subfigure}[h]{1.0\linewidth} \begin{subfigure}[h]{1.0\linewidth}
\begin{tabu} to \textwidth {@{}lc*5{X[c]}@{}} \begin{tabu} to \textwidth {@{}lc*5{X[c]}@{}}
\Tstrut \Bstrut & Default & D. 0.2 & D. 0.4 & G. &G.+D.\,0.2 & G.+D.\,0.4 \\ \Tstrut \Bstrut & \textsc{\,Adam\,} & D. 0.2 & D. 0.4 & G. &G.+D.\,0.2 & G.+D.\,0.4 \\
\hline \hline
\multicolumn{7}{c}{Test Accuracy}\Bstrut \\ \multicolumn{7}{c}{Test Accuracy}\Bstrut \\
\cline{2-7} \cline{2-7}
mean \Tstrut & 0.9914 & 0.9923 & 0.9930 & 0.9937 & 0.9943 & 0.9944 \\ mean \Tstrut & 0.9914 & 0.9923 & 0.9930 & 0.9937 & 0.9938 & 0.9943 \\
max & 0.9926 & 0.9930 & 0.9934 & 0.9946 & 0.9957 & 0.9956 \\ max & 0.9926 & 0.9930 & 0.9934 & 0.9946 & 0.9955 & 0.9956 \\
min & 0.9887 & 0.9909 & 0.9922 & 0.9929 & 0.9930 & 0.9934 \\ min & 0.9887 & 0.9909 & 0.9922 & 0.9929 & 0.9929 & 0.9934 \\
\hline \hline
\multicolumn{7}{c}{Training Accuracy}\Bstrut \\ \multicolumn{7}{c}{Training Accuracy}\Bstrut \\
\cline{2-7} \cline{2-7}
@ -64,16 +64,15 @@ plot coordinates {
max & 0.9996 & 0.9996 & 0.9992 & 0.9979 & 0.9971 & 0.9937 \\ max & 0.9996 & 0.9996 & 0.9992 & 0.9979 & 0.9971 & 0.9937 \\
min & 0.9992 & 0.9990 & 0.9984 & 0.9947 & 0.9926 & 0.9908 \\ min & 0.9992 & 0.9990 & 0.9984 & 0.9947 & 0.9926 & 0.9908 \\
\end{tabu} \end{tabu}
\caption{Mean, maximum and minimum accuracy after 50 epochs of training.} \caption{Mean and maximum accuracy after 48 epochs of training.}
\label{fig:gen_dropout_b} \label{fig:gen_dropout_b}
\end{subfigure} \end{subfigure}
\caption[Performance Comparison of Overfitting Measures]{Accuracy \caption[Performance comparison of overfitting measures]{Accuracy for the net given in ... with Dropout (D.),
for the net given in Figure~\ref{fig:mnist_architecture} with Dropout (D.),
data generation (G.), a combination, or neither (Default) implemented and trained data generation (G.), a combination, or neither (Default) implemented and trained
with \textsc{Adam}. For each epoch the 60.000 training samples with \textsc{Adam}. For each epoch the 60.000 training samples
were used, or for data generation 10.000 steps with each using were used, or for data generation 10.000 steps with each using
batches of 60 generated data points. For each configuration the batches of 60 generated data points. For each configuration the
model was trained five times and the average accuracies at each epoch model was trained 5 times and the average accuracies at each epoch
are given in (a). Mean, maximum and minimum values of accuracy on are given in (a). Mean, maximum and minimum values of accuracy on
the test and training set are given in (b).} the test and training set are given in (b).}
\label{fig:gen_dropout} \label{fig:gen_dropout}

25
TeX/Figures/mnist.tex
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@ -1,39 +1,38 @@
\begin{figure}[h] \begin{figure}[h]
\centering \centering
\begin{subfigure}{0.19\textwidth} \begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Figures/Data/mnist0.pdf} \includegraphics[width=\textwidth]{Plots/Data/mnist0.pdf}
\end{subfigure} \end{subfigure}
\begin{subfigure}{0.19\textwidth} \begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Figures/Data/mnist1.pdf} \includegraphics[width=\textwidth]{Plots/Data/mnist1.pdf}
\end{subfigure} \end{subfigure}
\begin{subfigure}{0.19\textwidth} \begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Figures/Data/mnist2.pdf} \includegraphics[width=\textwidth]{Plots/Data/mnist2.pdf}
\end{subfigure} \end{subfigure}
\begin{subfigure}{0.19\textwidth} \begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Figures/Data/mnist3.pdf} \includegraphics[width=\textwidth]{Plots/Data/mnist3.pdf}
\end{subfigure} \end{subfigure}
\begin{subfigure}{0.19\textwidth} \begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Figures/Data/mnist4.pdf} \includegraphics[width=\textwidth]{Plots/Data/mnist4.pdf}
\end{subfigure}\\ \end{subfigure}\\
\begin{subfigure}{0.19\textwidth} \begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Figures/Data/mnist5.pdf} \includegraphics[width=\textwidth]{Plots/Data/mnist5.pdf}
\end{subfigure} \end{subfigure}
\begin{subfigure}{0.19\textwidth} \begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Figures/Data/mnist6.pdf} \includegraphics[width=\textwidth]{Plots/Data/mnist6.pdf}
\end{subfigure} \end{subfigure}
\begin{subfigure}{0.19\textwidth} \begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Figures/Data/mnist7.pdf} \includegraphics[width=\textwidth]{Plots/Data/mnist7.pdf}
\end{subfigure} \end{subfigure}
\begin{subfigure}{0.19\textwidth} \begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Figures/Data/mnist8.pdf} \includegraphics[width=\textwidth]{Plots/Data/mnist8.pdf}
\end{subfigure} \end{subfigure}
\begin{subfigure}{0.19\textwidth} \begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Figures/Data/mnist9.pdf} \includegraphics[width=\textwidth]{Plots/Data/mnist9.pdf}
\end{subfigure} \end{subfigure}
\caption[MNIST Database of Handwritten Digits]{The MNIST database of handwritten \caption[MNIST data set]{The MNIST data set contains 70.000 images of preprocessed handwritten
digits contains 70.000 images of preprocessed handwritten
digits. Of these images 60.000 are used as training images, while digits. Of these images 60.000 are used as training images, while
the rest is used to validate the models trained.} the rest are used to validate the models trained.}
\label{fig:MNIST} \label{fig:MNIST}
\end{figure} \end{figure}
%%% Local Variables: %%% Local Variables:

601
TeX/Figures/pfg_test.tex
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@ -8,363 +8,286 @@
\usepackage{showframe} \usepackage{showframe}
\usepackage{graphicx} \usepackage{graphicx}
\usepackage{titlecaps} \usepackage{titlecaps}
\usepackage{amssymb}
\usepackage{mathtools}%add-on and patches to amsmath
\usetikzlibrary{calc, 3d} \usetikzlibrary{calc, 3d}
\usepgfplotslibrary{colorbrewer} \usepgfplotslibrary{colorbrewer}
\newcommand\Tstrut{\rule{0pt}{2.6ex}} % = `top' strut \newcommand\Tstrut{\rule{0pt}{2.6ex}} % = `top' strut
\newcommand\Bstrut{\rule[-0.9ex]{0pt}{0pt}} % = `bottom' strut \newcommand\Bstrut{\rule[-0.9ex]{0pt}{0pt}} % = `bottom' strut
\DeclareMathOperator*{\plim}{\mathbb{P}\text{-}\lim}
\DeclareMathOperator{\supp}{supp}
\DeclareMathOperator*{\argmin}{arg\,min}
\DeclareMathOperator*{\po}{\mathbb{P}\text{-}\mathcal{O}}
\DeclareMathOperator*{\equals}{=}
\begin{document} \begin{document}
\newcommand{\plimn}[0]{\plim\limits_{n \to \infty}} \pgfplotsset{
\newcommand{\norm}[1]{\left\lVert#1\right\rVert} compat=1.11,
% \pgfplotsset{ legend image code/.code={
% compat=1.11, \draw[mark repeat=2,mark phase=2]
% legend image code/.code={ plot coordinates {
% \draw[mark repeat=2,mark phase=2] (0cm,0cm)
% plot coordinates { (0.3cm,0cm) %% default is (0.3cm,0cm)
% (0cm,0cm) (0.6cm,0cm) %% default is (0.6cm,0cm)
% (0.3cm,0cm) %% default is (0.3cm,0cm) };%
% (0.6cm,0cm) %% default is (0.6cm,0cm) }
% };% }
% } \begin{figure}
% } \begin{subfigure}[h]{\textwidth}
% \begin{figure} \begin{tikzpicture}
% \begin{subfigure}[h]{\textwidth} \begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed,
% \begin{tikzpicture} /pgf/number format/precision=3},tick style = {draw = none}, width = \textwidth,
% \begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed, height = 0.35\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east},
% /pgf/number format/precision=3},tick style = {draw = none}, width = \textwidth, ylabel = {Test Accuracy}, cycle
% height = 0.35\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east}, list/Dark2, every axis plot/.append style={line width
% ylabel = {Test Accuracy}, cycle =1.25pt}]
% list/Dark2, every axis plot/.append style={line width % \addplot [dashed] table
% =1.25pt}] % [x=epoch, y=accuracy, col sep=comma, mark = none]
% % \addplot [dashed] table % {Data/adam_datagen_full.log};
% % [x=epoch, y=accuracy, col sep=comma, mark = none] \addplot table
% % {Data/adam_datagen_full.log}; [x=epoch, y=val_accuracy, col sep=comma, mark = none]
% \addplot table {Data/adam_1.mean};
% [x=epoch, y=val_accuracy, col sep=comma, mark = none] % \addplot [dashed] table
% {Data/adam_1.mean}; % [x=epoch, y=accuracy, col sep=comma, mark = none]
% % \addplot [dashed] table % {Data/adam_datagen_dropout_02_full.log};
% % [x=epoch, y=accuracy, col sep=comma, mark = none] \addplot table
% % {Data/adam_datagen_dropout_02_full.log}; [x=epoch, y=val_accuracy, col sep=comma, mark = none]
% \addplot table {Data/adam_datagen_1.mean};
% [x=epoch, y=val_accuracy, col sep=comma, mark = none] \addplot table
% {Data/adam_datagen_1.mean}; [x=epoch, y=val_accuracy, col sep=comma, mark = none]
% \addplot table {Data/adam_datagen_dropout_02_1.mean};
% [x=epoch, y=val_accuracy, col sep=comma, mark = none] \addplot table
% {Data/adam_datagen_dropout_02_1.mean}; [x=epoch, y=val_accuracy, col sep=comma, mark = none]
% \addplot table {Data/adam_dropout_02_1.mean};
% [x=epoch, y=val_accuracy, col sep=comma, mark = none]
% {Data/adam_dropout_02_1.mean};
% \addlegendentry{\footnotesize{G.}} \addlegendentry{\footnotesize{G.}}
% \addlegendentry{\footnotesize{G. + D. 0.2}} \addlegendentry{\footnotesize{G. + D. 0.2}}
% \addlegendentry{\footnotesize{G. + D. 0.4}} \addlegendentry{\footnotesize{G. + D. 0.4}}
% \addlegendentry{\footnotesize{D. 0.2}} \addlegendentry{\footnotesize{D. 0.2}}
% \addlegendentry{\footnotesize{D. 0.4}} \addlegendentry{\footnotesize{D. 0.4}}
% \addlegendentry{\footnotesize{Default}} \addlegendentry{\footnotesize{Default}}
% \end{axis} \end{axis}
% \end{tikzpicture} \end{tikzpicture}
% \caption{1 sample per class} \caption{1 sample per class}
% \vspace{0.25cm} \vspace{0.25cm}
% \end{subfigure} \end{subfigure}
% \begin{subfigure}[h]{\textwidth} \begin{subfigure}[h]{\textwidth}
% \begin{tikzpicture} \begin{tikzpicture}
% \begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed, \begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed,
% /pgf/number format/precision=3},tick style = {draw = none}, width = \textwidth, /pgf/number format/precision=3},tick style = {draw = none}, width = \textwidth,
% height = 0.35\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east}, height = 0.35\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east},
% ylabel = {Test Accuracy}, cycle ylabel = {Test Accuracy}, cycle
% list/Dark2, every axis plot/.append style={line width list/Dark2, every axis plot/.append style={line width
% =1.25pt}] =1.25pt}]
% \addplot table \addplot table
% [x=epoch, y=val_accuracy, col sep=comma, mark = none] [x=epoch, y=val_accuracy, col sep=comma, mark = none]
% {Data/adam_dropout_00_10.mean}; {Data/adam_dropout_00_10.mean};
% \addplot table \addplot table
% [x=epoch, y=val_accuracy, col sep=comma, mark = none] [x=epoch, y=val_accuracy, col sep=comma, mark = none]
% {Data/adam_dropout_02_10.mean}; {Data/adam_dropout_02_10.mean};
% \addplot table \addplot table
% [x=epoch, y=val_accuracy, col sep=comma, mark = none] [x=epoch, y=val_accuracy, col sep=comma, mark = none]
% {Data/adam_datagen_dropout_00_10.mean}; {Data/adam_datagen_dropout_00_10.mean};
% \addplot table \addplot table
% [x=epoch, y=val_accuracy, col sep=comma, mark = none] [x=epoch, y=val_accuracy, col sep=comma, mark = none]
% {Data/adam_datagen_dropout_02_10.mean}; {Data/adam_datagen_dropout_02_10.mean};
% \addlegendentry{\footnotesize{G.}} \addlegendentry{\footnotesize{G.}}
% \addlegendentry{\footnotesize{G. + D. 0.2}} \addlegendentry{\footnotesize{G. + D. 0.2}}
% \addlegendentry{\footnotesize{G. + D. 0.4}} \addlegendentry{\footnotesize{G. + D. 0.4}}
% \addlegendentry{\footnotesize{D. 0.2}} \addlegendentry{\footnotesize{D. 0.2}}
% \addlegendentry{\footnotesize{D. 0.4}} \addlegendentry{\footnotesize{D. 0.4}}
% \addlegendentry{\footnotesize{Default}} \addlegendentry{\footnotesize{Default}}
% \end{axis} \end{axis}
% \end{tikzpicture} \end{tikzpicture}
% \caption{10 samples per class} \caption{10 samples per class}
% \end{subfigure} \end{subfigure}
% \begin{subfigure}[h]{\textwidth} \begin{subfigure}[h]{\textwidth}
% \begin{tikzpicture} \begin{tikzpicture}
% \begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed, \begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed,
% /pgf/number format/precision=3},tick style = {draw = none}, width = 0.9875\textwidth, /pgf/number format/precision=3},tick style = {draw = none}, width = 0.9875\textwidth,
% height = 0.35\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east}, height = 0.35\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east},
% xlabel = {epoch}, ylabel = {Test Accuracy}, cycle xlabel = {epoch}, ylabel = {Test Accuracy}, cycle
% list/Dark2, every axis plot/.append style={line width list/Dark2, every axis plot/.append style={line width
% =1.25pt}, ymin = {0.92}] =1.25pt}, ymin = {0.92}]
% \addplot table \addplot table
% [x=epoch, y=val_accuracy, col sep=comma, mark = none] [x=epoch, y=val_accuracy, col sep=comma, mark = none]
% {Data/adam_dropout_00_100.mean}; {Data/adam_dropout_00_100.mean};
% \addplot table \addplot table
% [x=epoch, y=val_accuracy, col sep=comma, mark = none] [x=epoch, y=val_accuracy, col sep=comma, mark = none]
% {Data/adam_dropout_02_100.mean}; {Data/adam_dropout_02_100.mean};
% \addplot table \addplot table
% [x=epoch, y=val_accuracy, col sep=comma, mark = none] [x=epoch, y=val_accuracy, col sep=comma, mark = none]
% {Data/adam_datagen_dropout_00_100.mean}; {Data/adam_datagen_dropout_00_100.mean};
% \addplot table \addplot table
% [x=epoch, y=val_accuracy, col sep=comma, mark = none] [x=epoch, y=val_accuracy, col sep=comma, mark = none]
% {Data/adam_datagen_dropout_02_100.mean}; {Data/adam_datagen_dropout_02_100.mean};
% \addlegendentry{\footnotesize{G.}} \addlegendentry{\footnotesize{G.}}
% \addlegendentry{\footnotesize{G. + D. 0.2}} \addlegendentry{\footnotesize{G. + D. 0.2}}
% \addlegendentry{\footnotesize{G. + D. 0.4}} \addlegendentry{\footnotesize{G. + D. 0.4}}
% \addlegendentry{\footnotesize{D. 0.2}} \addlegendentry{\footnotesize{D. 0.2}}
% \addlegendentry{\footnotesize{D. 0.4}} \addlegendentry{\footnotesize{D. 0.4}}
% \addlegendentry{\footnotesize{Default}} \addlegendentry{\footnotesize{Default}}
% \end{axis} \end{axis}
% \end{tikzpicture} \end{tikzpicture}
% \caption{100 samples per class} \caption{100 samples per class}
% \vspace{.25cm} \vspace{.25cm}
% \end{subfigure} \end{subfigure}
% \caption{Accuracy for the net given in ... with Dropout (D.), \caption{Accuracy for the net given in ... with Dropout (D.),
% data generation (G.), a combination, or neither (Default) implemented and trained data generation (G.), a combination, or neither (Default) implemented and trained
% with \textsc{Adam}. For each epoch the 60.000 training samples with \textsc{Adam}. For each epoch the 60.000 training samples
% were used, or for data generation 10.000 steps with each using were used, or for data generation 10.000 steps with each using
% batches of 60 generated data points. For each configuration the batches of 60 generated data points. For each configuration the
% model was trained 5 times and the average accuracies at each epoch model was trained 5 times and the average accuracies at each epoch
% are given in (a). Mean, maximum and minimum values of accuracy on are given in (a). Mean, maximum and minimum values of accuracy on
% the test and training set are given in (b).} the test and training set are given in (b).}
% \end{figure} \end{figure}
% \begin{table} \begin{table}
% \centering \centering
% \begin{tabu} to \textwidth {@{}l*4{X[c]}@{}} \begin{tabu} to \textwidth {@{}l*4{X[c]}@{}}
% \Tstrut \Bstrut & \textsc{Adam} & D. 0.2 & Gen & Gen.+D. 0.2 \\ \Tstrut \Bstrut & \textsc{Adam} & D. 0.2 & Gen & Gen.+D. 0.2 \\
% \hline \hline
% & &
% \multicolumn{4}{c}{\titlecap{test accuracy for 1 sample}}\Bstrut \\ \multicolumn{4}{c}{\titlecap{test accuracy for 1 sample}}\Bstrut \\
% \cline{2-5} \cline{2-5}
% max \Tstrut & 0.5633 & 0.5312 & 0.6704 & 0.6604 \\ max \Tstrut & 0.5633 & 0.5312 & 0.6704 & 0.6604 \\
% min & 0.3230 & 0.4224 & 0.4878 & 0.5175 \\ min & 0.3230 & 0.4224 & 0.4878 & 0.5175 \\
% mean & 0.4570 & 0.4714 & 0.5862 & 0.6014 \\ mean & 0.4570 & 0.4714 & 0.5862 & 0.6014 \\
% var & 0.0040 & 0.0012 & 0.0036 & 0.0023 \\ var & 0.0040 & 0.0012 & 0.0036 & 0.0023 \\
% \hline \hline
% & &
% \multicolumn{4}{c}{\titlecap{test accuracy for 10 samples}}\Bstrut \\ \multicolumn{4}{c}{\titlecap{test accuracy for 10 samples}}\Bstrut \\
% \cline{2-5} \cline{2-5}
% max \Tstrut & 0.8585 & 0.9423 & 0.9310 & 0.9441 \\ max \Tstrut & 0.8585 & 0.9423 & 0.9310 & 0.9441 \\
% min & 0.8148 & 0.9081 & 0.9018 & 0.9061 \\ min & 0.8148 & 0.9081 & 0.9018 & 0.9061 \\
% mean & 0.8377 & 0.9270 & 0.9185 & 0.9232 \\ mean & 0.8377 & 0.9270 & 0.9185 & 0.9232 \\
% var & 2.7e-4 & 1.3e-4 & 6e-05 & 1.5e-4 \\ var & 2.7e-4 & 1.3e-4 & 6e-05 & 1.5e-4 \\
% \hline \hline
% & &
% \multicolumn{4}{c}{\titlecap{test accuracy for 100 samples}}\Bstrut \\ \multicolumn{4}{c}{\titlecap{test accuracy for 100 samples}}\Bstrut \\
% \cline{2-5} \cline{2-5}
% max & 0.9637 & 0.9796 & 0.9810 & 0.9805 \\ max & 0.9637 & 0.9796 & 0.9810 & 0.9805 \\
% min & 0.9506 & 0.9719 & 0.9702 & 0.9727 \\ min & 0.9506 & 0.9719 & 0.9702 & 0.9727 \\
% mean & 0.9582 & 0.9770 & 0.9769 & 0.9783 \\ mean & 0.9582 & 0.9770 & 0.9769 & 0.9783 \\
% var & 2e-05 & 1e-05 & 1e-05 & 0 \\ var & 2e-05 & 1e-05 & 1e-05 & 0 \\
% \hline \hline
% \end{tabu} \end{tabu}
% \caption{Values of the test accuracy of the model trained 10 times \caption{Values of the test accuracy of the model trained 10 times
% of random training sets containing 1, 10 and 100 data points per of random training sets containing 1, 10 and 100 data points per
% class.} class.}
% \end{table} \end{table}
% \begin{center} \begin{center}
% \begin{figure}[h] \begin{figure}[h]
% \centering \centering
% \begin{subfigure}{\textwidth} \begin{subfigure}{0.19\textwidth}
% \includegraphics[width=\textwidth]{Data/cnn_fashion_fig.pdf} \includegraphics[width=\textwidth]{Data/mnist0.pdf}
% \caption{original\\image} \caption{original\\image}
% \end{subfigure} \end{subfigure}
% \begin{subfigure}{\textwidth} \begin{subfigure}{0.19\textwidth}
% \includegraphics[width=\textwidth]{Data/cnn_fashion_fig1.pdf} \includegraphics[width=\textwidth]{Data/mnist_gen_zoom.pdf}
% \caption{random\\zoom} \caption{random\\zoom}
% \end{subfigure} \end{subfigure}
% \begin{subfigure}{0.19\textwidth} \begin{subfigure}{0.19\textwidth}
% \includegraphics[width=\textwidth]{Data/mnist_gen_shear.pdf} \includegraphics[width=\textwidth]{Data/mnist_gen_shear.pdf}
% \caption{random\\shear} \caption{random\\shear}
% \end{subfigure} \end{subfigure}
% \begin{subfigure}{0.19\textwidth} \begin{subfigure}{0.19\textwidth}
% \includegraphics[width=\textwidth]{Data/mnist_gen_rotation.pdf} \includegraphics[width=\textwidth]{Data/mnist_gen_rotation.pdf}
% \caption{random\\rotation} \caption{random\\rotation}
% \end{subfigure} \end{subfigure}
% \begin{subfigure}{0.19\textwidth} \begin{subfigure}{0.19\textwidth}
% \includegraphics[width=\textwidth]{Data/mnist_gen_shift.pdf} \includegraphics[width=\textwidth]{Data/mnist_gen_shift.pdf}
% \caption{random\\positional shift} \caption{random\\positional shift}
% \end{subfigure}\\ \end{subfigure}\\
% \begin{subfigure}{0.19\textwidth} \begin{subfigure}{0.19\textwidth}
% \includegraphics[width=\textwidth]{Data/mnist5.pdf} \includegraphics[width=\textwidth]{Data/mnist5.pdf}
% \end{subfigure} \end{subfigure}
% \begin{subfigure}{0.19\textwidth} \begin{subfigure}{0.19\textwidth}
% \includegraphics[width=\textwidth]{Data/mnist6.pdf} \includegraphics[width=\textwidth]{Data/mnist6.pdf}
% \end{subfigure} \end{subfigure}
% \begin{subfigure}{0.19\textwidth} \begin{subfigure}{0.19\textwidth}
% \includegraphics[width=\textwidth]{Data/mnist7.pdf} \includegraphics[width=\textwidth]{Data/mnist7.pdf}
% \end{subfigure} \end{subfigure}
% \begin{subfigure}{0.19\textwidth} \begin{subfigure}{0.19\textwidth}
% \includegraphics[width=\textwidth]{Data/mnist8.pdf} \includegraphics[width=\textwidth]{Data/mnist8.pdf}
% \end{subfigure} \end{subfigure}
% \begin{subfigure}{0.19\textwidth} \begin{subfigure}{0.19\textwidth}
% \includegraphics[width=\textwidth]{Data/mnist9.pdf} \includegraphics[width=\textwidth]{Data/mnist9.pdf}
% \end{subfigure} \end{subfigure}
% \caption{The MNIST data set contains 70.000 images of preprocessed handwritten \caption{The MNIST data set contains 70.000 images of preprocessed handwritten
% digits. Of these images 60.000 are used as training images, while digits. Of these images 60.000 are used as training images, while
% the rest are used to validate the models trained.} the rest are used to validate the models trained.}
% \end{figure} \end{figure}
% \end{center} \end{center}
% \begin{figure} \begin{figure}
% \begin{adjustbox}{width=\textwidth} \begin{adjustbox}{width=\textwidth}
% \begin{tikzpicture} \begin{tikzpicture}
% \begin{scope}[x = (0:1cm), y=(90:1cm), z=(15:-0.5cm)] \begin{scope}[x = (0:1cm), y=(90:1cm), z=(15:-0.5cm)]
% \node[canvas is xy plane at z=0, transform shape] at (0,0) \node[canvas is xy plane at z=0, transform shape] at (0,0)
% {\includegraphics[width=5cm]{Data/klammern_r.jpg}}; {\includegraphics[width=5cm]{Data/klammern_r.jpg}};
% \node[canvas is xy plane at z=2, transform shape] at (0,-0.2) \node[canvas is xy plane at z=2, transform shape] at (0,-0.2)
% {\includegraphics[width=5cm]{Data/klammern_g.jpg}}; {\includegraphics[width=5cm]{Data/klammern_g.jpg}};
% \node[canvas is xy plane at z=4, transform shape] at (0,-0.4) \node[canvas is xy plane at z=4, transform shape] at (0,-0.4)
% {\includegraphics[width=5cm]{Data/klammern_b.jpg}}; {\includegraphics[width=5cm]{Data/klammern_b.jpg}};
% \node[canvas is xy plane at z=4, transform shape] at (-8,-0.2) \node[canvas is xy plane at z=4, transform shape] at (-8,-0.2)
% {\includegraphics[width=5.3cm]{Data/klammern_rgb.jpg}}; {\includegraphics[width=5.3cm]{Data/klammern_rgb.jpg}};
% \end{scope} \end{scope}
% \end{tikzpicture} \end{tikzpicture}
% \end{adjustbox} \end{adjustbox}
% \caption{On the right the red, green and blue chanels of the picture \caption{On the right the red, green and blue chanels of the picture
% are displayed. In order to better visualize the color channes the are displayed. In order to better visualize the color channes the
% black and white picture of each channel has been colored in the black and white picture of each channel has been colored in the
% respective color. Combining the layers results in the image on the respective color. Combining the layers results in the image on the
% left} left}
% \end{figure} \end{figure}
% \begin{figure} \begin{figure}
% \centering \centering
% \begin{subfigure}{\linewidth} \begin{subfigure}{\linewidth}
% \centering \centering
% \includegraphics[width=\textwidth]{Data/convnet_fig.pdf} \includegraphics[width=\textwidth]{Data/convnet_fig.pdf}
% \end{subfigure} \end{subfigure}
% \begin{subfigure}{.45\linewidth} \begin{subfigure}{.45\linewidth}
% \centering \centering
% \begin{tikzpicture} \begin{tikzpicture}
% \begin{axis}[enlargelimits=false, width=\textwidth] \begin{axis}[enlargelimits=false, width=\textwidth]
% \addplot[domain=-5:5, samples=100]{tanh(x)}; \addplot[domain=-5:5, samples=100]{tanh(x)};
% \end{axis} \end{axis}
% \end{tikzpicture} \end{tikzpicture}
% \end{subfigure} \end{subfigure}
% \begin{subfigure}{.45\linewidth} \begin{subfigure}{.45\linewidth}
% \centering \centering
% \begin{tikzpicture} \begin{tikzpicture}
% \begin{axis}[enlargelimits=false, width=\textwidth, \begin{axis}[enlargelimits=false, width=\textwidth,
% ytick={0,2,4},yticklabels={\hphantom{4.}0,2,4}, ymin=-1] ytick={0,2,4},yticklabels={\hphantom{4.}0,2,4}, ymin=-1]
% \addplot[domain=-5:5, samples=100]{max(0,x)}; \addplot[domain=-5:5, samples=100]{max(0,x)};
% \end{axis} \end{axis}
% \end{tikzpicture} \end{tikzpicture}
% \end{subfigure} \end{subfigure}
% \begin{subfigure}{.45\linewidth} \begin{subfigure}{.45\linewidth}
% \centering \centering
% \begin{tikzpicture} \begin{tikzpicture}
% \begin{axis}[enlargelimits=false, width=\textwidth, ymin=-1, \begin{axis}[enlargelimits=false, width=\textwidth, ymin=-1,
% ytick={0,2,4},yticklabels={$\hphantom{-5.}0$,2,4}] ytick={0,2,4},yticklabels={$\hphantom{-5.}0$,2,4}]
% \addplot[domain=-5:5, samples=100]{max(0,x)+ 0.1*min(0,x)}; \addplot[domain=-5:5, samples=100]{max(0,x)+ 0.1*min(0,x)};
% \end{axis} \end{axis}
% \end{tikzpicture} \end{tikzpicture}
% \end{subfigure} \end{subfigure}
% \end{figure} \end{figure}
% \begin{tikzpicture}
% \begin{axis}[enlargelimits=false]
% \addplot [domain=-5:5, samples=101,unbounded coords=jump]{1/(1+exp(-x)};
% \addplot[domain=-5:5, samples=100]{tanh(x)};
% \addplot[domain=-5:5, samples=100]{max(0,x)};
% \end{axis}
% \end{tikzpicture}
% \begin{tikzpicture}
% \begin{axis}[enlargelimits=false]
% \addplot[domain=-2*pi:2*pi, samples=100]{cos(deg(x))};
% \end{axis}
% \end{tikzpicture}
\newcommand{\abs}[1]{\ensuremath{\left\vert#1\right\vert}}
\[
\sum_{k \in \kappa : \xi_k < T} \varphi(\xi_k, v_k)
h_{k,n} = \sum_{\substack{l \in \mathbb{Z} \\ [\delta l, \delta
(l+1)) \in [C_{g_\xi}^l,\min\{C_{g_\xi}^u, T \}]}}
\left(\sum_{\substack{k \in \kappa \\ \xi_k \in
[\delta l , \delta(l+1))}} \varphi(\xi_k, v_k)
h_{k,n}\right) \approx
\]
\[
\approx \sum_{\substack{l \in \mathbb{Z} \\ [\delta l, \delta
(l+1)) \in [C_{g_\xi}^l,\min\{C_{g_\xi}^u, T \}]}}
\left(\sum_{\substack{k \in \kappa \\ \xi_k \in
[\delta l , \delta(l+1))}} \left(\varphi(\delta l, v_k)
\frac{1}{n g_\xi (\delta l)} \pm \frac{\varepsilon}{n}\right)
\frac{\abs{\left\{m \in \kappa : \xi_m \in [\delta l,
\delta(l+1))\right\}}}{\abs{\left\{m \in \kappa : \xi_m
\in [\delta l, \delta(l+1))\right\}}}\right)
\]
\[
\approx \sum_{\substack{l \in \mathbb{Z} \\ [\delta l, \delta
(l+1)) \in [C_{g_\xi}^l,\min\{C_{g_\xi}^u, T \}]}}
\left(\frac{\sum_{\substack{k \in \kappa \\ \xi_k \in
[\delta l , \delta(l+1))}}\varphi(\delta l,
v_k)}{\abs{\left\{m \in \kappa : \xi_m
\in [\delta l, \delta(l+1))\right\}}}
\frac{\abs{\left\{m \in \kappa : \xi_m \in [\delta l,
\delta(l+1))\right\}}}{n g_\xi (\delta l)}\right) \pm \varepsilon
\]
The amount of kinks in a given interval of length $\delta$ follows a
binomial distribution,
\[
\mathbb{E} \left[\abs{\left\{m \in \kappa : \xi_m \in [\delta l,
\delta(l+1))\right\}}\right] = n \int_{\delta
l}^{\delta(l+1)}g_\xi (x) dx \approx n (\delta g_\xi(\delta l)
\pm \delta \tilde{\varepsilon}),
\]
for any $\delta \leq \delta(\varepsilon, \tilde{\varepsilon})$, since $g_\xi$ is uniformly continuous on its
support by Assumption..
As the distribution of $v$ is continuous as well we get
$\mathcal{L}(v_k) = \mathcal{L} v| \xi = \delta l) \forall k \in
\kappa : \xi_k \in [\delta l, \delta(l+1))$ for $delta \leq
\delta(\varepsilon, \tilde{\varepsilon})$. Thus we get with the law of
large numbers
\begin{align*}
&\sum_{k \in \kappa : \xi_k < T} \varphi(\xi_k, v_k)
h_{k,n} \approx\\
&\approx \sum_{\substack{l \in \mathbb{Z} \\ [\delta l, \delta
(l+1)) \in [C_{g_\xi}^l,\min\{C_{g_\xi}^u, T
\}]}}\left(\mathbb{E}[\phi(\xi, v)|\xi=\delta l]
\stackrel{\mathbb{P}}{\pm}\right) \delta \left(1 \pm
\frac{\tilde{\varepsilon}}{g_\xi(\delta l)}\right) \pm \varepsilon
\\
&\approx \left(\sum_{\substack{l \in \mathbb{Z} \\ [\delta
l, \delta
(l+1)) \in [C_{g_\xi}^l,\min\{C_{g_\xi}^u, T
\}]}}\mathbb{E}[\phi(\xi, v)|\xi=\delta l] \delta
\stackrel{\mathbb{P}}{\pm}\tilde{\tilde{\varepsilon}}
\abs{C_{g_\xi}^u - C_{g_\xi}^l}
\right)\\
&\phantom{\approx}\cdot \left(1 \pm
\frac{\tilde{\varepsilon}}{g_\xi(\delta l)}\right) \pm \varepsilon
\end{align*}
\newpage
\begin{tikzpicture}
\begin{axis}[enlargelimits=false]
\addplot [domain=-5:5, samples=101,unbounded coords=jump]{1/(1+exp(-x)};
\addplot[domain=-5:5, samples=100]{tanh(x)};
\addplot[domain=-5:5, samples=100]{max(0,x)};
\end{axis}
\end{tikzpicture}
\begin{tikzpicture}
\begin{axis}[enlargelimits=false]
\addplot[domain=-2*pi:2*pi, samples=100]{cos(deg(x))};
\end{axis}
\end{tikzpicture}
\end{document} \end{document}

77
TeX/Figures/sdg_comparison.tex
View File

@ -4,56 +4,34 @@ legend image code/.code={
\draw[mark repeat=2,mark phase=2] \draw[mark repeat=2,mark phase=2]
plot coordinates { plot coordinates {
(0cm,0cm) (0cm,0cm)
(0.15cm,0cm) %% default is (0.3cm,0cm) (0.0cm,0cm) %% default is (0.3cm,0cm)
(0.3cm,0cm) %% default is (0.6cm,0cm) (0.0cm,0cm) %% default is (0.6cm,0cm)
};% };%
} }
} }
\begin{figure} \begin{figure}
\begin{subfigure}[h]{\textwidth} \begin{subfigure}[h]{\textwidth}
\begin{tikzpicture} \begin{tikzpicture}
\begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed, \begin{axis}[tick style = {draw = none}, width = \textwidth,
/pgf/number format/precision=3},tick style = {draw = none}, width = 0.975\textwidth, height = 0.6\textwidth, ymin = 0.92, legend style={at={(0.9825,0.75)},anchor=north east},
height = 0.6\textwidth, ymin = 0.885, legend style={at={(0.9825,0.0175)},anchor=south east}, xlabel = {epoch}, ylabel = {Classification Accuracy}]
xlabel = {Epoch}, ylabel = {Test Accuracy}, cycle
list/Dark2, every axis plot/.append style={line width
=1.25pt}]
% [tick style = {draw = none}, width = \textwidth,
% height = 0.6\textwidth, ymin = 0.905, legend style={at={(0.9825,0.75)},anchor=north east},
% xlabel = {epoch}, ylabel = {Classification Accuracy}]
% \addplot table
% [x=epoch, y=val_accuracy, col sep=comma, mark = none]
% {Figures/Data/adagrad.log};
% \addplot table
% [x=epoch, y=val_accuracy, col sep=comma, mark = none]
% {Figures/Data/adadelta.log};
% \addplot table
% [x=epoch, y=val_accuracy, col sep=comma, mark = none]
% {Figures/Data/adam.log};
\addplot table \addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none] [x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Figures/Data/Adagrad.mean}; {Figures/Data/adagrad.log};
\addplot table \addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none] [x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Figures/Data/Adadelta.mean}; {Figures/Data/adadelta.log};
\addplot table \addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none] [x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Figures/Data/Adam.mean}; {Figures/Data/adam.log};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Figures/Data/SGD_00.mean};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Figures/Data/SGD_09.mean};
\addlegendentry{\footnotesize{\textsc{AdaGrad}}} \addlegendentry{\footnotesize{ADAGRAD}}
\addlegendentry{\footnotesize{\textsc{Adadelta}}} \addlegendentry{\footnotesize{ADADELTA}}
\addlegendentry{\footnotesize{\textsc{Adam}}} \addlegendentry{\footnotesize{ADAM}}
\addlegendentry{\footnotesize{\textsc{Sgd}}} \addlegendentry{SGD$_{0.01}$}
\addlegendentry{\footnotesize{Momentum}}
\end{axis} \end{axis}
\end{tikzpicture} \end{tikzpicture}
\caption{Test accuracies during training} %\caption{Classification accuracy}
\vspace{.25cm} \vspace{.25cm}
\end{subfigure} \end{subfigure}
% \begin{subfigure}[b]{\textwidth} % \begin{subfigure}[b]{\textwidth}
@ -80,27 +58,18 @@ plot coordinates {
% \vspace{.25cm} % \vspace{.25cm}
% \end{subfigure} % \end{subfigure}
\begin{subfigure}[b]{1.0\linewidth} \begin{subfigure}[b]{1.0\linewidth}
\begin{tabu} to \textwidth {@{}l*5{X[c]}@{}} \begin{tabu} to \textwidth {@{} *3{X[c]}c*3{X[c]} @{}}
\Tstrut \Bstrut &\textsc{AdaGrad}& \textsc{AdaDelta}& \multicolumn{3}{c}{Classification Accuracy}
\textsc{Adam} & \textsc{Sgd} & Momentum \\ &~&\multicolumn{3}{c}{Error Measure}
\hline \\\cline{1-3}\cline{5-7}
\Tstrut Accuracy &0.9870 & 0.9562 & 0.9925 & 0.9866 & 0.9923 \\ ADAGRAD&ADADELTA&ADAM&&ADAGRAD&ADADELTA&ADAM
\Tstrut Loss &0.0404 & 0.1447 & 0.0999 & 0.0403 & 0.0246 \\ \\\cline{1-3}\cline{5-7}
1&1&1&&1&1&1
\end{tabu} \end{tabu}
% \begin{tabu} to \textwidth {@{} *3{X[c]}c*3{X[c]} @{}} \caption{Performace metrics after 20 epochs}
% \multicolumn{3}{c}{Classification Accuracy}
% &~&\multicolumn{3}{c}{Error Measure}
% \\\cline{1-3}\cline{5-7}
% \textsc{AdaGad}&\textsc{AdaDelta}&\textsc{Adam}&&\textsc{AdaGrad}&\textsc{AdaDelta}&\textsc{Adam}
% \\\cline{1-3}\cline{5-7}
% 1&1&1&&1&1&1
% \end{tabu}
\caption{Performace metrics after 50 epochs}
\end{subfigure} \end{subfigure}
\caption[Performance Comparison of Training Algorithms]{ \caption[Performance comparison of training algorithms]{Classification accuracy on the test set and ...Performance metrics of the network given in ... trained
Average performance metrics of the neural network given in with different optimization algorithms}
Figure~\ref{fig:mnist_architecture} trained 5 times for 50 epochs
using different optimization algorithms.}
\label{fig:comp_alg} \label{fig:comp_alg}
\end{figure} \end{figure}
%%% Local Variables: %%% Local Variables:

5
TeX/Figures/sin_conv.tex
View File

@ -14,7 +14,6 @@
\end{adjustbox} \end{adjustbox}
\caption{True position (\textcolor{red}{red}), distorted position data (black)} \caption{True position (\textcolor{red}{red}), distorted position data (black)}
\end{subfigure} \end{subfigure}
\hfill
\begin{subfigure}[b]{0.49\textwidth} \begin{subfigure}[b]{0.49\textwidth}
\centering \centering
\begin{adjustbox}{width=\textwidth, height=0.25\textheight} \begin{adjustbox}{width=\textwidth, height=0.25\textheight}
@ -29,11 +28,11 @@
\end{adjustbox} \end{adjustbox}
\caption{True position (\textcolor{red}{red}), filtered position data (black)} \caption{True position (\textcolor{red}{red}), filtered position data (black)}
\end{subfigure} \end{subfigure}
\caption[Signal Smoothing Using Convolution]{Example for noise reduction using convolution with simulated \caption[Signal smoothing using convolution]{Example for noise reduction using convolution with simulated
positional data. As filter positional data. As filter
$g(i)=\left(\nicefrac{1}{3},\nicefrac{1}{4},\nicefrac{1}{5},\nicefrac{1}{6},\nicefrac{1}{20}\right)_{(i-1)}$ $g(i)=\left(\nicefrac{1}{3},\nicefrac{1}{4},\nicefrac{1}{5},\nicefrac{1}{6},\nicefrac{1}{20}\right)_{(i-1)}$
is chosen and applied to the $x$ and $y$ coordinate is chosen and applied to the $x$ and $y$ coordinate
data separately. The convolution of both signals with $g$ data seperately. The convolution of both signals with $g$
improves the MSE of the positions from 0.196 to 0.170 and improves the MSE of the positions from 0.196 to 0.170 and
visibly smoothes the data. visibly smoothes the data.
} }

445
TeX/Figures/test.tex
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@ -11,306 +11,165 @@
\definecolor{ipython_red}{RGB}{186, 33, 33} \definecolor{ipython_red}{RGB}{186, 33, 33}
\definecolor{ipython_green}{RGB}{0, 128, 0} \definecolor{ipython_green}{RGB}{0, 128, 0}
\definecolor{ipython_cyan}{RGB}{64, 128, 128} \definecolor{ipython_cyan}{RGB}{64, 128, 128}
\definecolor{ipython_purple}{RGB}{110, 64, 130} \definecolor{ipython_purple}{RGB}{170, 34, 255}
\usepackage{listings} \usepackage{listings}
\usepackage{float} \lstset{
breaklines=true,
%
extendedchars=true,
literate=
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{à}{{\`a}}1 {è}{{\`e}}1 {ì}{{\`i}}1 {ò}{{\`o}}1 {ù}{{\`u}}1
{À}{{\`A}}1 {È}{{\'E}}1 {Ì}{{\`I}}1 {Ò}{{\`O}}1 {Ù}{{\`U}}1
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{ç}{{\c c}}1 {Ç}{{\c C}}1 {ø}{{\o}}1 {å}{{\r a}}1 {Å}{{\r A}}1
{€}{{\EUR}}1 {£}{{\pounds}}1
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\usepackage{amsmath,amssymb}
% \newfloat{lstfloat}{htbp}{lop}
% \floatname{lstfloat}{Listing}
% \def\lstfloatautorefname{Listing}
% \lstset{
% breaklines=true,
%% %%
%% Python definition (c) 1998 Michael Weber
%% Additional definitions (2013) Alexis Dimitriadis
%% modified by me (should not have empty lines)
%%
\lstdefinelanguage{iPython}{
morekeywords={access,and,break,class,continue,def,del,elif,else,except,exec,finally,for,from,global,if,import,in,is,lambda,not,or,pass,print,raise,return,try,while},%
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morekeywords=[2]{abs,all,any,basestring,bin,bool,bytearray,callable,chr,classmethod,cmp,compile,complex,delattr,dict,dir,divmod,enumerate,eval,execfile,file,filter,float,format,frozenset,getattr,globals,hasattr,hash,help,hex,id,input,int,isinstance,issubclass,iter,len,list,locals,long,map,max,memoryview,min,next,object,oct,open,ord,pow,property,range,raw_input,reduce,reload,repr,reversed,round,set,setattr,slice,sorted,staticmethod,str,sum,super,tuple,type,unichr,unicode,vars,xrange,zip,apply,buffer,coerce,intern},%
%
sensitive=true,%
morecomment=[l]\#,%
morestring=[b]',%
morestring=[b]",%
%
morestring=[s]{'''}{'''},% used for documentation text (mulitiline strings)
morestring=[s]{"""}{"""},% added by Philipp Matthias Hahn
%
morestring=[s]{r'}{'},% `raw' strings
morestring=[s]{r"}{"},%
morestring=[s]{r'''}{'''},%
morestring=[s]{r"""}{"""},%
morestring=[s]{u'}{'},% unicode strings
morestring=[s]{u"}{"},%
morestring=[s]{u'''}{'''},%
morestring=[s]{u"""}{"""},%
%
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% *{-}{-}{1} will not replace in comments and so on
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% %%
% %% Python definition (c) 1998 Michael Weber
% %% Additional definitions (2013) Alexis Dimitriadis
% %% modified by me (should not have empty lines)
% %%
% \lstdefinelanguage{iPython}{
% morekeywords={access,and,break,class,continue,def,del,elif,else,except,exec,finally,for,from,global,if,import,
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% %
% % Built-ins
% morekeywords=[2]{abs,all,any,basestring,bin,bool,bytearray,callable,chr,classmethod,cmp,compile,complex,delattr,dict,dir,divmod,enumerate,eval,execfile,file,filter,float,format,frozenset,getattr,globals,hasattr,hash,help,hex,id,input,int,isinstance,issubclass,iter,len,list,locals,long,map,max,memoryview,min,next,object,oct,open,ord,pow,property,range,raw_input,reduce,reload,repr,reversed,round,set,setattr,slice,sorted,staticmethod,str,sum,super,tuple,type,unichr,unicode,vars,xrange,zip,apply,buffer,coerce,intern,val},%
% %
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% morestring=[s]{'''}{'''},% used for documentation text (mulitiline strings)
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% %
% morestring=[s]{r'}{'},% `raw' strings
% morestring=[s]{r"}{"},%
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% keywordstyle = [2]{\color{ipython_cyan}\ttfamily},
% }
% \begin{document}
% \begin{lstfloat}
% \begin{lstlisting}[language=iPython]
% import breeze.stats.distributions.Uniform
% import breeze.stats.distributions.Gaussian
% import scala.language.postfixOps
% object Activation {
% def apply(x: Double): Double = math.max(0, x)
% def d(x: Double): Double = if (x > 0) 1 else 0
% }
% class RSNN(val n: Int, val gamma: Double = 0.001) {
% val g_unif = Uniform(-10, 10)
% val g_gauss = Gaussian(0, 5)
% val xis = g_unif.sample(n)
% val vs = g_gauss.sample(n)
% val bs = xis zip vs map {case(xi, v) => xi * v}
% def computeL1(x: Double) = (bs zip vs) map {
% case (b, v) => Activation(b + v * x) }
% def computeL2(l1: Seq[Double], ws: Seq[Double]): Double =
% (l1 zip ws) map { case (l, w) => w * l } sum
% def output(ws: Seq[Double])(x: Double): Double =
% computeL2(computeL1(x), ws)
% def learn(data: Seq[(Double, Double)], ws: Seq[Double],
% lamb: Double, gamma: Double): Seq[Double] = {
% lazy val deltas = data.map {
% case (x, y) =>
% val l1 = computeL1(x) // n
% val out = computeL2(l1, ws) // 1
% (l1 zip ws) map {case (l1, w) => (l1 * 2 * (out - y) +
% lam * 2 * w) * gamma * -1}
% }
% deltas.foldRight(ws)(
% (delta, ws) => ws zip (delta) map { case (w, d) => w + d })
% }
% def train(data: Seq[(Double, Double)], iter: Int, lam: Double,
% gamma: Double = gamma): (Seq[Double], Double => Double)= {
% val ws = (1 to iter).foldRight((1 to n).map(
% _ => 0.0) :Seq[Double])((i, w) => {
% println(s"Training iteration $i")
% println(w.sum/w.length)
% learn(data, w, lam, gamma / 10)
% })
% (ws, output(ws))
% }
% }
% \end{lstlisting}
% \caption{Scala code used to build and train the ridge penalized
% randomized shallow neural network in .... The parameter \textit{lam}
% in the train function represents the $\lambda$ parameter in the error
% function. The parameters \textit{n} and \textit{gamma} set the number
% of hidden nodes and the stepsize for training.}
% \end{lstfloat}
% \clearpage
% \begin{lstlisting}[language=iPython]
% import tensorflow as tf
% import numpy as np
% from tensorflow.keras.callbacks import CSVLogger
% from tensorflow.keras.preprocessing.image import ImageDataGenerator
% mnist = tf.keras.datasets.mnist
% (x_train, y_train), (x_test, y_test) = mnist.load_data()
% x_train = x_train.reshape(x_train.shape[0], 28, 28, 1)
% x_train = x_train / 255.0
% x_test = x_test.reshape(x_test.shape[0], 28, 28, 1)
% x_test = x_test / 255.0
% y_train = tf.keras.utils.to_categorical(y_train)
% y_test = tf.keras.utils.to_categorical(y_test)
% model = tf.keras.models.Sequential()
% model.add(tf.keras.layers.Conv2D(24,kernel_size=5,padding='same',activation='relu',input_shape=(28,28,1)))
% model.add(tf.keras.layers.MaxPool2D())
% model.add(tf.keras.layers.Conv2D(64,kernel_size=5,padding='same',activation='relu'))
% model.add(tf.keras.layers.MaxPool2D(padding='same'))
% model.add(tf.keras.layers.Flatten())
% model.add(tf.keras.layers.Dense(256, activation='relu'))
% model.add(tf.keras.layers.Dropout(0.2))
% model.add(tf.keras.layers.Dense(10, activation='softmax'))
% model.compile(optimizer='adam', loss="categorical_crossentropy",
% metrics=["accuracy"])
% datagen = ImageDataGenerator(
% rotation_range = 30,
% zoom_range = 0.15,
% width_shift_range=2,
% height_shift_range=2,
% shear_range = 1)
% csv_logger = CSVLogger(<Target File>)
% history = model.fit(datagen.flow(x_train, y_train, batch_size=50),
% validation_data=(x_test, y_test),
% epochs=125, callbacks=[csv_logger],
% steps_per_epoch = x_train.shape[0]//50)
% \end{lstlisting}
% \clearpage
% \begin{lstlisting}[language=iPython]
% import tensorflow as tf
% import numpy as np
% from tensorflow.keras.callbacks import CSVLogger
% from tensorflow.keras.preprocessing.image import ImageDataGenerator
% mnist = tf.keras.datasets.fashion_mnist
% (x_train, y_train), (x_test, y_test) = mnist.load_data()
% x_train = x_train.reshape(x_train.shape[0], 28, 28, 1)
% x_test = x_test.reshape(x_test.shape[0], 28, 28, 1)
% x_train, x_test = x_train / 255.0, x_test / 255.0
% y_train = tf.keras.utils.to_categorical(y_train)
% y_test = tf.keras.utils.to_categorical(y_test)
% model = tf.keras.Sequential()
% model.add(tf.keras.layers.Conv2D(filters = 32, kernel_size = (3, 3), activation='relu',
% input_shape = (28, 28, 1), padding='same'))
% model.add(tf.keras.layers.Conv2D(filters = 32, kernel_size = (2, 2), activation='relu', padding = 'same'))
% model.add(tf.keras.layers.MaxPool2D(strides=(2,2)))
% model.add(tf.keras.layers.Conv2D(filters = 64, kernel_size = (3, 3), activation='relu', padding='same'))
% model.add(tf.keras.layers.Conv2D(filters = 64, kernel_size = (3, 3), activation='relu', padding='same'))
% model.add(tf.keras.layers.MaxPool2D(strides=(2,2)))
% model.add(tf.keras.layers.Flatten())
% model.add(tf.keras.layers.Dense(256, activation='relu'))
% model.add(tf.keras.layers.Dropout(0.2))
% model.add(tf.keras.layers.Dense(10, activation='softmax'))
% model.compile(optimizer=tf.keras.optimizers.Adam(lr = 1e-3), loss="categorical_crossentropy", metrics=["accuracy"])
% datagen = ImageDataGenerator(
% rotation_range = 15,
% zoom_range = 0.1,
% width_shift_range=2,
% height_shift_range=2,
% shear_range = 0.5,
% fill_mode = 'constant',
% cval = 0)
% csv_logger = CSVLogger(<Target File>)
% history = model.fit(datagen.flow(x_train, y_train, batch_size=30),
% steps_per_epoch=2000,
% validation_data=(x_test, y_test),
% epochs=125, callbacks=[csv_logger],
% shuffle=True)
% \end{lstlisting}
% \begin{lstlisting}[language=iPython]
% def get_random_sample(a, b, number_of_samples=10):
% x = []
% y = []
% for category_number in range(0,10):
% # get all samples of a category
% train_data_category = a[b==category_number]
% # pick a number of random samples from the category
% train_data_category = train_data_category[np.random.randint(
% train_data_category.shape[0], size=number_of_samples), :]
% x.extend(train_data_category)
% y.append([category_number]*number_of_samples)
% return (np.asarray(x).reshape(-1, 28, 28, 1),
% np.asarray(y).reshape(10*number_of_samples,1))
% \end{lstlisting}
\begin{document} \begin{document}
\begin{lstlisting}[language=iPython]
import tensorflow as tf
import numpy as np
from tensorflow.keras.callbacks import CSVLogger
from tensorflow.keras.preprocessing.image import ImageDataGenerator
\begin{align} mnist = tf.keras.datasets.mnist
\makebox[2cm][c]{$\overset{\text{Lem. A.6}}{\underset{\delta \text{
small enough}}{=}} $}
\end{align}
(x_train, y_train), (x_test, y_test) = mnist.load_data()
x_train = x_train.reshape(x_train.shape[0], 28, 28, 1)
x_train = x_train / 255.0
x_test = x_test.reshape(x_test.shape[0], 28, 28, 1)
x_test = x_test / 255.0
y_train = tf.keras.utils.to_categorical(y_train)
y_test = tf.keras.utils.to_categorical(y_test)
model = tf.keras.models.Sequential()
model.add(tf.keras.layers.Conv2D(24,kernel_size=5,padding='same',activation='relu',input_shape=(28,28,1)))
model.add(tf.keras.layers.MaxPool2D())
model.add(tf.keras.layers.Conv2D(64,kernel_size=5,padding='same',activation='relu'))
model.add(tf.keras.layers.MaxPool2D(padding='same'))
model.add(tf.keras.layers.Flatten())
model.add(tf.keras.layers.Dense(256, activation='relu'))
model.add(tf.keras.layers.Dropout(j))
model.add(tf.keras.layers.Dense(10, activation='softmax'))
model.compile(optimizer='adam', loss="categorical_crossentropy",
metrics=["accuracy"])
datagen = ImageDataGenerator(
rotation_range = 30,
zoom_range = 0.15,
width_shift_range=2,
height_shift_range=2,
shear_range = 1)
csv_logger = CSVLogger(<Target File>)
history = model.fit(datagen.flow(x_train_, y_train_, batch_size=50),
validation_data=(x_test, y_test), epochs=125,
callbacks=[csv_logger],
steps_per_epoch = x_train_.shape[0]//50)
\end{lstlisting}
\begin{lstlisting}[language=iPython]
def get_random_sample(a, b, number_of_samples=10):
x = []
y = []
for category_number in range(0,10):
# get all samples of a category
train_data_category = a[b==category_number]
# pick a number of random samples from the category
train_data_category = train_data_category[np.random.randint(
train_data_category.shape[0], size=number_of_samples), :]
x.extend(train_data_category)
y.append([category_number]*number_of_samples)
return (np.asarray(x).reshape(-1, 28, 28, 1),
np.asarray(y).reshape(10*number_of_samples,1))
\end{lstlisting}
\end{document} \end{document}
%%% Local Variables:
%%% mode: latex
%%% TeX-master: t
%%% End:

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TeX/Plots/Data/min_max.txt Executable file
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datagen_dropout_02_1
test
0.6604& 0.5175& 0.60136& 0.002348447
datagen_dropout_00_1
test
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dropout_02_1
test
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default_1
test
0.5633& 0.3230& 0.45702& 0.004021449
datagen_dropout_02_10
test
0.9441& 0.9061& 0.92322& 0.00015
train
1& 0.97& 0.989& 1e-04
datagen_dropout_00_10
test
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train
1& 0.97& 0.99& 0.00013
dropout_02_10
test
0.9423& 0.9081& 0.92696& 0.00013
train
1& 0.99& 0.992& 2e-05
default_10
test
0.8585& 0.8148& 0.83771& 0.00027
train
1& 1& 1& 0
datagen_dropout_02_100
test
0.9805& 0.9727& 0.97826& 0
train
datagen_dropout_00_100
test
0.981& 0.9702& 0.9769& 1e-05
train
dropout_02_100
test
0.9796& 0.9719& 0.97703& 1e-05
train
default_100
test
0.9637& 0.9506& 0.95823& 2e-05

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TeX/Plots/Data/scala_out_sin.csv Executable file
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7
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64
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59 58 5.7 -0.550685542597638 5.9238064899769 -0.541063721566544 5.59865656961444 -0.627040990301198
60 59 5.8 -0.464602179413757 5.8067999294844 -0.43156566524513 5.68077207716296 -0.552246304884294
61 60 5.9 -0.373876664830236 5.93089453525347 -0.604056792592816 5.80084302534748 -0.550733954237757
62 61 6 -0.279415498198926 6.02965160059402 -0.234452930170458 5.91786841211583 -0.434812265604247
63 62 6.1 -0.182162504272095 5.88697419016579 -0.135764844759742 5.91990685000071 -0.323660336266941
64 63 6.2 -0.0830894028174964 5.91445270773648 -0.0073552500992853 5.92798052258888 -0.205537962618181

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\pgfplotsset{
compat=1.11,
legend image code/.code={
\draw[mark repeat=2,mark phase=2]
plot coordinates {
(0cm,0cm)
(0.075cm,0cm) %% default is (0.3cm,0cm)
(0.15cm,0cm) %% default is (0.6cm,0cm)
};%
}
}
\begin{figure}
\begin{subfigure}[b]{0.5\textwidth}
\begin{subfigure}[b]{\textwidth}
\begin{adjustbox}{width=\textwidth, height=0.25\textheight}
\begin{tikzpicture}
\begin{axis}[
ytick = {-1, 0, 1, 2},
yticklabels = {$-1$, $\phantom{-0.}0$, $1$, $2$},]
\addplot table [x=x, y=y, col sep=comma, only marks,
forget plot] {Plots/Data/sin_6.csv};
\addplot [black, line width=2pt] table [x=x, y=y, col
sep=comma, mark=none] {Plots/Data/matlab_0.csv};
\addplot [red, line width = 1.5pt, dashed] table [x=x_n_5000_tl_0.0,
y=y_n_5000_tl_0.0, col sep=comma, mark=none] {Plots/Data/scala_out_sin.csv};
\addlegendentry{$f_1^{*, 0.1}$};
\addlegendentry{$\mathcal{RN}_w^{\tilde{\lambda}}$};
\end{axis}
\end{tikzpicture}
\end{adjustbox}
\caption{$\lambda = 0.1$}
\end{subfigure}\\
\begin{subfigure}[b]{\textwidth}
\begin{adjustbox}{width=\textwidth, height=0.25\textheight}
\begin{tikzpicture}
\begin{axis}
\addplot table [x=x, y=y, col sep=comma, only marks,
forget plot] {Plots/Data/sin_6.csv};
\addplot [black, line width=2pt] table [x=x, y=y, col sep=comma, mark=none] {Plots/Data/matlab_1.csv};
\addplot [red, line width = 1.5pt, dashed] table [x=x_n_5000_tl_1.0,
y=y_n_5000_tl_1.0, col sep=comma, mark=none] {Plots/Data/scala_out_sin.csv};
\addlegendentry{$f_1^{*, 1.0}$};
\addlegendentry{$\mathcal{RN}_w^{\tilde{\lambda}}$};
\end{axis}
\end{tikzpicture}
\end{adjustbox}
\caption{$\lambda = 1.0$}
\end{subfigure}\\
\begin{subfigure}[b]{\textwidth}
\begin{adjustbox}{width=\textwidth, height=0.25\textheight}
\begin{tikzpicture}
\begin{axis}
\addplot table [x=x, y=y, col sep=comma, only marks,
forget plot] {Plots/Data/sin_6.csv};
\addplot [black, line width=2pt] table [x=x, y=y, col sep=comma, mark=none] {Plots/Data/matlab_3.csv};
\addplot [red, line width = 1.5pt, dashed] table [x=x_n_5000_tl_3.0,
y=y_n_5000_tl_3.0, col sep=comma, mark=none] {Plots/Data/scala_out_sin.csv};
\addlegendentry{$f_1^{*, 3.0}$};
\addlegendentry{$\mathcal{RN}_w^{\tilde{\lambda}}$};
\end{axis}
\end{tikzpicture}
\end{adjustbox}
\caption{$\lambda = 3.0$}
\end{subfigure}
\end{subfigure}
\begin{subfigure}[b]{0.5\textwidth}
\begin{subfigure}[b]{\textwidth}
\begin{adjustbox}{width=\textwidth, height=0.245\textheight}
\begin{tikzpicture}
\begin{axis}[
ytick = {-2,-1, 0, 1, 2},
yticklabels = {$-2$,$-1$, $\phantom{-0.}0$, $1$, $2$},]
\addplot table [x=x, y=y, col sep=comma, only marks,
forget plot] {Plots/Data/data_sin_d_t.csv};
\addplot [black, line width=2pt] table [x=x, y=y, col sep=comma, mark=none] {Plots/Data/matlab_sin_d_01.csv};
\addplot [red, line width = 1.5pt, dashed] table [x=x_n_5000_tl_0.1,
y=y_n_5000_tl_0.1, col sep=comma, mark=none] {Plots/Data/scala_out_d_1_t.csv};
\addlegendentry{$f_1^{*, 0.1}$};
\addlegendentry{$\mathcal{RN}_w^{\tilde{\lambda}}$};
\end{axis}
\end{tikzpicture}
\end{adjustbox}
\caption{$\lambda = 0.1$}
\end{subfigure}\\
\begin{subfigure}[b]{\textwidth}
\begin{adjustbox}{width=\textwidth, height=0.25\textheight}
\begin{tikzpicture}
\begin{axis}
\addplot table [x=x, y=y, col sep=comma, only marks,
forget plot] {Plots/Data/data_sin_d_t.csv};
\addplot [black, line width=2pt] table [x=x, y=y, col sep=comma, mark=none] {Plots/Data/matlab_sin_d_1.csv};
\addplot [red, line width = 1.5pt, dashed] table [x=x_n_5000_tl_1.0,
y=y_n_5000_tl_1.0, col sep=comma, mark=none] {Plots/Data/scala_out_d_1_t.csv};
\addlegendentry{$f_1^{*, 1.0}$};
\addlegendentry{$\mathcal{RN}_w^{\tilde{\lambda},*}$};
\end{axis}
\end{tikzpicture}
\end{adjustbox}
\caption{$\lambda = 1.0$}
\end{subfigure}\\
\begin{subfigure}[b]{\textwidth}
\begin{adjustbox}{width=\textwidth, height=0.25\textheight}
\begin{tikzpicture}
\begin{axis}
\addplot table [x=x, y=y, col sep=comma, only marks,
forget plot] {Plots/Data/data_sin_d_t.csv};
\addplot [black, line width=2pt] table [x=x, y=y, col sep=comma, mark=none] {Plots/Data/matlab_sin_d_3.csv};
\addplot [red, line width = 1.5pt, dashed] table [x=x_n_5000_tl_3.0,
y=y_n_5000_tl_3.0, col sep=comma, mark=none] {Plots/Data/scala_out_d_1_t.csv};
\addlegendentry{$f_1^{*, 3.0}$};
\addlegendentry{$\mathcal{RN}_w^{\tilde{\lambda}}$};
\end{axis}
\end{tikzpicture}
\end{adjustbox}
\caption{$\lambda = 3.0$}
\end{subfigure}
\end{subfigure}
\caption[Comparison of shallow neural networks and regression
splines]{% In these Figures the behaviour stated in ... is
% visualized
% in two exaples. For $(a), (b), (c)$ six values of sinus equidistantly
% spaced on $[-\pi, \pi]$ have been used as training data. For
% $(d),(e),(f)$ 15 equidistand values have been used, where
% $y_i^{train} = \sin(x_i^{train}) + \varepsilon_i$ and
% $\varepsilon_i \sim \mathcal{N}(0, 0.3)$. For
% $\mathcal{RN}_w^{\tilde{\lambda, *}}$ the random weights are
% distributed as follows
% \begin{align*}
% \xi_k &\sim
% \end{align*}
Ridge Penalized Neural Network compared to Regression Spline,
with them being trained on $\text{data}_A$ in a), b), c) and on
$\text{data}_B$ in d), e), f).
The Parameters of each are given above.
}
\label{fig:rn_vs_rs}
\end{figure}
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\pgfplotsset{
compat=1.11,
legend image code/.code={
\draw[mark repeat=2,mark phase=2]
plot coordinates {
(0cm,0cm)
(0.0cm,0cm) %% default is (0.3cm,0cm)
(0.0cm,0cm) %% default is (0.6cm,0cm)
};%
}
}
\begin{figure}
\begin{subfigure}[h!]{\textwidth}
\begin{tikzpicture}
\begin{axis}[tick style = {draw = none}, width = \textwidth,
height = 0.6\textwidth,
xtick = {1, 3, 5,7,9,11,13,15,17,19},
xticklabels = {$2$, $4$, $6$, $8$,
$10$,$12$,$14$,$16$,$18$,$20$},
xlabel = {training epoch}, ylabel = {classification accuracy}]
\addplot table
[x=epoch, y=val_accuracy, col sep=comma] {Plots/Data/GD_01.log};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma] {Plots/Data/GD_05.log};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma] {Plots/Data/GD_1.log};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma]
{Plots/Data/SGD_01_b32.log};
\addlegendentry{GD$_{0.01}$}
\addlegendentry{GD$_{0.05}$}
\addlegendentry{GD$_{0.1}$}
\addlegendentry{SGD$_{0.01}$}
\end{axis}
\end{tikzpicture}
%\caption{Classification accuracy}
\end{subfigure}
\begin{subfigure}[b]{\textwidth}
\begin{tikzpicture}
\begin{axis}[tick style = {draw = none}, width = \textwidth,
height = 0.6\textwidth,
ytick = {0, 1, 2, 3, 4},
yticklabels = {$0$, $1$, $\phantom{0.}2$, $3$, $4$},
xtick = {1, 3, 5,7,9,11,13,15,17,19},
xticklabels = {$2$, $4$, $6$, $8$,
$10$,$12$,$14$,$16$,$18$,$20$},
xlabel = {training epoch}, ylabel = {error measure\vphantom{fy}}]
\addplot table
[x=epoch, y=val_loss, col sep=comma] {Plots/Data/GD_01.log};
\addplot table
[x=epoch, y=val_loss, col sep=comma] {Plots/Data/GD_05.log};
\addplot table
[x=epoch, y=val_loss, col sep=comma] {Plots/Data/GD_1.log};
\addplot table
[x=epoch, y=val_loss, col sep=comma] {Plots/Data/SGD_01_b32.log};
\addlegendentry{GD$_{0.01}$}
\addlegendentry{GD$_{0.05}$}
\addlegendentry{GD$_{0.1}$}
\addlegendentry{SGD$_{0.01}$}
\end{axis}
\end{tikzpicture}
\caption{Performance metrics during training}
\end{subfigure}
% \\~\\
\caption[Performance comparison of SDG and GD]{The neural network given in ?? trained with different
algorithms on the MNIST handwritten digits data set. For gradient
descent the learning rated 0.01, 0.05 and 0.1 are (GD$_{\cdot}$). For
stochastic gradient descend a batch size of 32 and learning rate
of 0.01 is used (SDG$_{0.01}$).}
\label{fig:sgd_vs_gd}
\end{figure}
\begin{table}[h]
\begin{tabu} to \textwidth {@{} *4{X[c]}c*4{X[c]} @{}}
\multicolumn{4}{c}{Classification Accuracy}
&~&\multicolumn{4}{c}{Error Measure}
\\\cline{1-4}\cline{6-9}
GD$_{0.01}$&GD$_{0.05}$&GD$_{0.1}$&SGD$_{0.01}$&&GD$_{0.01}$&GD$_{0.05}$&GD$_{0.1}$&SGD$_{0.01}$
\\\cline{1-4}\cline{6-9}
\multicolumn{9}{c}{test}\\
0.265&0.633&0.203&0.989&&2.267&1.947&3.91&0.032
\end{tabu}
\caption{Performance metrics of the networks trained in
Figure~\ref{fig:sgd_vs_gd} after 20 training epochs.}
\label{table:sgd_vs_gd}
\end{table}
%%% Local Variables:
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\message{ !name(pfg_test.tex)}\documentclass{article}
\usepackage{pgfplots}
\usepackage{filecontents}
\usepackage{subcaption}
\usepackage{adjustbox}
\usepackage{xcolor}
\usepackage{graphicx}
\usetikzlibrary{calc, 3d}
\begin{document}
\message{ !name(pfg_test.tex) !offset(6) }
\end{axis}
\end{tikzpicture}
\end{adjustbox}
\caption{True position (\textcolor{red}{red}), distorted data (black)}
\end{figure}
\begin{center}
\begin{figure}[h]
\begin{subfigure}{0.49\textwidth}
\includegraphics[width=\textwidth]{Data/klammern.jpg}
\caption{Original Picure}
\end{subfigure}
\begin{subfigure}{0.49\textwidth}
\includegraphics[width=\textwidth]{Data/image_conv4.png}
\caption{test}
\end{subfigure}
\begin{subfigure}{0.49\textwidth}
\includegraphics[width=\textwidth]{Data/image_conv5.png}
\caption{test}
\end{subfigure}
\begin{subfigure}{0.49\textwidth}
\includegraphics[width=\textwidth]{Data/image_conv6.png}
\caption{test}
\end{subfigure}
\end{figure}
\end{center}
\begin{figure}
\begin{adjustbox}{width=\textwidth}
\begin{tikzpicture}
\begin{scope}[x = (0:1cm), y=(90:1cm), z=(15:-0.5cm)]
\node[canvas is xy plane at z=0, transform shape] at (0,0)
{\includegraphics[width=5cm]{Data/klammern_r.jpg}};
\node[canvas is xy plane at z=2, transform shape] at (0,-0.2)
{\includegraphics[width=5cm]{Data/klammern_g.jpg}};
\node[canvas is xy plane at z=4, transform shape] at (0,-0.4)
{\includegraphics[width=5cm]{Data/klammern_b.jpg}};
\node[canvas is xy plane at z=4, transform shape] at (-8,-0.2)
{\includegraphics[width=5.3cm]{Data/klammern_rgb.jpg}};
\end{scope}
\end{tikzpicture}
\end{adjustbox}
\caption{On the right the red, green and blue chanels of the picture
are displayed. In order to better visualize the color channes the
black and white picture of each channel has been colored in the
respective color. Combining the layers results in the image on the
left}
\end{figure}
\message{ !name(pfg_test.tex) !offset(3) }
\end{document}
%%% Local Variables:
%%% mode: latex
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\begin{figure}[h]
\centering
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Plots/Data/fashion_mnist0.pdf}
\caption{T-shirt/top}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Plots/Data/fashion_mnist1.pdf}
\caption{Trousers}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Plots/Data/fashion_mnist2.pdf}
\caption{Pullover}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Plots/Data/fashion_mnist3.pdf}
\caption{Dress}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Plots/Data/fashion_mnist4.pdf}
\caption{Coat}
\end{subfigure}\\
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Plots/Data/fashion_mnist5.pdf}
\caption{Sandal}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Plots/Data/fashion_mnist6.pdf}
\caption{Shirt}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Plots/Data/fashion_mnist7.pdf}
\caption{Sneaker}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Plots/Data/fashion_mnist8.pdf}
\caption{Bag}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Plots/Data/fashion_mnist9.pdf}
\caption{Ankle boot}
\end{subfigure}
\caption[Fashion MNIST data set]{The fashtion MNIST data set contains 70.000 images of
preprocessed product images from Zalando, which are categorized as
T-shirt/top, Trouser, Pullover, Dress, Coat, Sandal, Shirt,
Sneaker, Bag, Ankle boot. Of these images 60.000 are used as training images, while
the rest are used to validate the models trained.}
\label{fig:MNIST}
\end{figure}
%%% Local Variables:
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\pgfplotsset{
compat=1.11,
legend image code/.code={
\draw[mark repeat=2,mark phase=2]
plot coordinates {
(0cm,0cm)
(0.15cm,0cm) %% default is (0.3cm,0cm)
(0.3cm,0cm) %% default is (0.6cm,0cm)
};%
}
}
\begin{figure}
\begin{subfigure}[h]{\textwidth}
\begin{tikzpicture}
\begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed,
/pgf/number format/precision=3},tick style = {draw = none}, width = \textwidth,
height = 0.6\textwidth, ymin = 0.988, legend style={at={(0.9825,0.0175)},anchor=south east},
xlabel = {epoch}, ylabel = {Classification Accuracy}, cycle
list/Dark2, every axis plot/.append style={line width =1.25pt}]
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Plots/Data/adam_datagen_full_mean.log};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Plots/Data/adam_datagen_dropout_02_full_mean.log};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Plots/Data/adam_datagen_dropout_04_full_mean.log};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Plots/Data/adam_dropout_02_full_mean.log};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Plots/Data/adam_dropout_04_full_mean.log};
\addplot [dashed] table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Plots/Data/adam_full_mean.log};
\addlegendentry{\footnotesize{G.}}
\addlegendentry{\footnotesize{G. + D. 0.2}}
\addlegendentry{\footnotesize{G. + D. 0.4}}
\addlegendentry{\footnotesize{D. 0.2}}
\addlegendentry{\footnotesize{D. 0.4}}
\addlegendentry{\footnotesize{Default}}
\end{axis}
\end{tikzpicture}
\caption{Classification accuracy}
\vspace{.25cm}
\end{subfigure}
\begin{subfigure}[h]{1.0\linewidth}
\begin{tabu} to \textwidth {@{}lc*5{X[c]}@{}}
\Tstrut \Bstrut & \textsc{\,Adam\,} & D. 0.2 & D. 0.4 & G. &G.+D.\,0.2 & G.+D.\,0.4 \\
\hline
\multicolumn{7}{c}{Test Accuracy}\Bstrut \\
\cline{2-7}
mean \Tstrut & 0.9914 & 0.9923 & 0.9930 & 0.9937 & 0.9938 & 0.9943 \\
max & 0.9926 & 0.9930 & 0.9934 & 0.9946 & 0.9955 & 0.9956 \\
min & 0.9887 & 0.9909 & 0.9922 & 0.9929 & 0.9929 & 0.9934 \\
\hline
\multicolumn{7}{c}{Training Accuracy}\Bstrut \\
\cline{2-7}
mean \Tstrut & 0.9994 & 0.9991 & 0.9989 & 0.9967 & 0.9954 & 0.9926 \\
max & 0.9996 & 0.9996 & 0.9992 & 0.9979 & 0.9971 & 0.9937 \\
min & 0.9992 & 0.9990 & 0.9984 & 0.9947 & 0.9926 & 0.9908 \\
\end{tabu}
\caption{Mean and maximum accuracy after 48 epochs of training.}
\label{fig:gen_dropout_b}
\end{subfigure}
\caption[Performance comparison of overfitting measures]{Accuracy for the net given in ... with Dropout (D.),
data generation (G.), a combination, or neither (Default) implemented and trained
with \textsc{Adam}. For each epoch the 60.000 training samples
were used, or for data generation 10.000 steps with each using
batches of 60 generated data points. For each configuration the
model was trained 5 times and the average accuracies at each epoch
are given in (a). Mean, maximum and minimum values of accuracy on
the test and training set are given in (b).}
\label{fig:gen_dropout}
\end{figure}
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\begin{figure}[h]
\centering
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Plots/Data/mnist0.pdf}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Plots/Data/mnist1.pdf}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Plots/Data/mnist2.pdf}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Plots/Data/mnist3.pdf}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Plots/Data/mnist4.pdf}
\end{subfigure}\\
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Plots/Data/mnist5.pdf}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Plots/Data/mnist6.pdf}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Plots/Data/mnist7.pdf}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Plots/Data/mnist8.pdf}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Plots/Data/mnist9.pdf}
\end{subfigure}
\caption[MNIST data set]{The MNIST data set contains 70.000 images of preprocessed handwritten
digits. Of these images 60.000 are used as training images, while
the rest are used to validate the models trained.}
\label{fig:MNIST}
\end{figure}
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\documentclass[a4paper, 12pt, draft=true]{article}
\usepackage{pgfplots}
\usepackage{filecontents}
\usepackage{subcaption}
\usepackage{adjustbox}
\usepackage{xcolor}
\usepackage{tabu}
\usepackage{showframe}
\usepackage{graphicx}
\usepackage{titlecaps}
\usetikzlibrary{calc, 3d}
\usepgfplotslibrary{colorbrewer}
\newcommand\Tstrut{\rule{0pt}{2.6ex}} % = `top' strut
\newcommand\Bstrut{\rule[-0.9ex]{0pt}{0pt}} % = `bottom' strut
\begin{document}
\pgfplotsset{
compat=1.11,
legend image code/.code={
\draw[mark repeat=2,mark phase=2]
plot coordinates {
(0cm,0cm)
(0.3cm,0cm) %% default is (0.3cm,0cm)
(0.6cm,0cm) %% default is (0.6cm,0cm)
};%
}
}
\begin{figure}
\begin{subfigure}[h]{\textwidth}
\begin{tikzpicture}
\begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed,
/pgf/number format/precision=3},tick style = {draw = none}, width = \textwidth,
height = 0.35\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east},
ylabel = {Test Accuracy}, cycle
list/Dark2, every axis plot/.append style={line width
=1.25pt}]
% \addplot [dashed] table
% [x=epoch, y=accuracy, col sep=comma, mark = none]
% {Data/adam_datagen_full.log};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Data/adam_1.mean};
% \addplot [dashed] table
% [x=epoch, y=accuracy, col sep=comma, mark = none]
% {Data/adam_datagen_dropout_02_full.log};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Data/adam_datagen_1.mean};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Data/adam_datagen_dropout_02_1.mean};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Data/adam_dropout_02_1.mean};
\addlegendentry{\footnotesize{G.}}
\addlegendentry{\footnotesize{G. + D. 0.2}}
\addlegendentry{\footnotesize{G. + D. 0.4}}
\addlegendentry{\footnotesize{D. 0.2}}
\addlegendentry{\footnotesize{D. 0.4}}
\addlegendentry{\footnotesize{Default}}
\end{axis}
\end{tikzpicture}
\caption{1 sample per class}
\vspace{0.25cm}
\end{subfigure}
\begin{subfigure}[h]{\textwidth}
\begin{tikzpicture}
\begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed,
/pgf/number format/precision=3},tick style = {draw = none}, width = \textwidth,
height = 0.35\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east},
ylabel = {Test Accuracy}, cycle
list/Dark2, every axis plot/.append style={line width
=1.25pt}]
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Data/adam_dropout_00_10.mean};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Data/adam_dropout_02_10.mean};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Data/adam_datagen_dropout_00_10.mean};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Data/adam_datagen_dropout_02_10.mean};
\addlegendentry{\footnotesize{G.}}
\addlegendentry{\footnotesize{G. + D. 0.2}}
\addlegendentry{\footnotesize{G. + D. 0.4}}
\addlegendentry{\footnotesize{D. 0.2}}
\addlegendentry{\footnotesize{D. 0.4}}
\addlegendentry{\footnotesize{Default}}
\end{axis}
\end{tikzpicture}
\caption{10 samples per class}
\end{subfigure}
\begin{subfigure}[h]{\textwidth}
\begin{tikzpicture}
\begin{axis}[legend cell align={left},yticklabel style={/pgf/number format/fixed,
/pgf/number format/precision=3},tick style = {draw = none}, width = 0.9875\textwidth,
height = 0.35\textwidth, legend style={at={(0.9825,0.0175)},anchor=south east},
xlabel = {epoch}, ylabel = {Test Accuracy}, cycle
list/Dark2, every axis plot/.append style={line width
=1.25pt}, ymin = {0.92}]
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Data/adam_dropout_00_100.mean};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Data/adam_dropout_02_100.mean};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Data/adam_datagen_dropout_00_100.mean};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Data/adam_datagen_dropout_02_100.mean};
\addlegendentry{\footnotesize{G.}}
\addlegendentry{\footnotesize{G. + D. 0.2}}
\addlegendentry{\footnotesize{G. + D. 0.4}}
\addlegendentry{\footnotesize{D. 0.2}}
\addlegendentry{\footnotesize{D. 0.4}}
\addlegendentry{\footnotesize{Default}}
\end{axis}
\end{tikzpicture}
\caption{100 samples per class}
\vspace{.25cm}
\end{subfigure}
\caption{Accuracy for the net given in ... with Dropout (D.),
data generation (G.), a combination, or neither (Default) implemented and trained
with \textsc{Adam}. For each epoch the 60.000 training samples
were used, or for data generation 10.000 steps with each using
batches of 60 generated data points. For each configuration the
model was trained 5 times and the average accuracies at each epoch
are given in (a). Mean, maximum and minimum values of accuracy on
the test and training set are given in (b).}
\end{figure}
\begin{table}
\centering
\begin{tabu} to \textwidth {@{}l*4{X[c]}@{}}
\Tstrut \Bstrut & \textsc{Adam} & D. 0.2 & Gen & Gen.+D. 0.2 \\
\hline
&
\multicolumn{4}{c}{\titlecap{test accuracy for 1 sample}}\Bstrut \\
\cline{2-5}
max \Tstrut & 0.5633 & 0.5312 & 0.6704 & 0.6604 \\
min & 0.3230 & 0.4224 & 0.4878 & 0.5175 \\
mean & 0.4570 & 0.4714 & 0.5862 & 0.6014 \\
var & 0.0040 & 0.0012 & 0.0036 & 0.0023 \\
\hline
&
\multicolumn{4}{c}{\titlecap{test accuracy for 10 samples}}\Bstrut \\
\cline{2-5}
max \Tstrut & 0.8585 & 0.9423 & 0.9310 & 0.9441 \\
min & 0.8148 & 0.9081 & 0.9018 & 0.9061 \\
mean & 0.8377 & 0.9270 & 0.9185 & 0.9232 \\
var & 2.7e-4 & 1.3e-4 & 6e-05 & 1.5e-4 \\
\hline
&
\multicolumn{4}{c}{\titlecap{test accuracy for 100 samples}}\Bstrut \\
\cline{2-5}
max & 0.9637 & 0.9796 & 0.9810 & 0.9805 \\
min & 0.9506 & 0.9719 & 0.9702 & 0.9727 \\
mean & 0.9582 & 0.9770 & 0.9769 & 0.9783 \\
var & 2e-05 & 1e-05 & 1e-05 & 0 \\
\hline
\end{tabu}
\caption{Values of the test accuracy of the model trained 10 times
of random training sets containing 1, 10 and 100 data points per
class.}
\end{table}
\begin{center}
\begin{figure}[h]
\centering
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Data/mnist0.pdf}
\caption{original\\image}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Data/mnist_gen_zoom.pdf}
\caption{random\\zoom}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Data/mnist_gen_shear.pdf}
\caption{random\\shear}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Data/mnist_gen_rotation.pdf}
\caption{random\\rotation}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Data/mnist_gen_shift.pdf}
\caption{random\\positional shift}
\end{subfigure}\\
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Data/mnist5.pdf}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Data/mnist6.pdf}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Data/mnist7.pdf}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Data/mnist8.pdf}
\end{subfigure}
\begin{subfigure}{0.19\textwidth}
\includegraphics[width=\textwidth]{Data/mnist9.pdf}
\end{subfigure}
\caption{The MNIST data set contains 70.000 images of preprocessed handwritten
digits. Of these images 60.000 are used as training images, while
the rest are used to validate the models trained.}
\end{figure}
\end{center}
\begin{figure}
\begin{adjustbox}{width=\textwidth}
\begin{tikzpicture}
\begin{scope}[x = (0:1cm), y=(90:1cm), z=(15:-0.5cm)]
\node[canvas is xy plane at z=0, transform shape] at (0,0)
{\includegraphics[width=5cm]{Data/klammern_r.jpg}};
\node[canvas is xy plane at z=2, transform shape] at (0,-0.2)
{\includegraphics[width=5cm]{Data/klammern_g.jpg}};
\node[canvas is xy plane at z=4, transform shape] at (0,-0.4)
{\includegraphics[width=5cm]{Data/klammern_b.jpg}};
\node[canvas is xy plane at z=4, transform shape] at (-8,-0.2)
{\includegraphics[width=5.3cm]{Data/klammern_rgb.jpg}};
\end{scope}
\end{tikzpicture}
\end{adjustbox}
\caption{On the right the red, green and blue chanels of the picture
are displayed. In order to better visualize the color channes the
black and white picture of each channel has been colored in the
respective color. Combining the layers results in the image on the
left}
\end{figure}
\begin{figure}
\centering
\begin{subfigure}{.45\linewidth}
\centering
\begin{tikzpicture}
\begin{axis}[enlargelimits=false, ymin=0, ymax = 1, width=\textwidth]
\addplot [domain=-5:5, samples=101,unbounded coords=jump]{1/(1+exp(-x)};
\end{axis}
\end{tikzpicture}
\end{subfigure}
\begin{subfigure}{.45\linewidth}
\centering
\begin{tikzpicture}
\begin{axis}[enlargelimits=false, width=\textwidth]
\addplot[domain=-5:5, samples=100]{tanh(x)};
\end{axis}
\end{tikzpicture}
\end{subfigure}
\begin{subfigure}{.45\linewidth}
\centering
\begin{tikzpicture}
\begin{axis}[enlargelimits=false, width=\textwidth,
ytick={0,2,4},yticklabels={\hphantom{4.}0,2,4}, ymin=-1]
\addplot[domain=-5:5, samples=100]{max(0,x)};
\end{axis}
\end{tikzpicture}
\end{subfigure}
\begin{subfigure}{.45\linewidth}
\centering
\begin{tikzpicture}
\begin{axis}[enlargelimits=false, width=\textwidth, ymin=-1,
ytick={0,2,4},yticklabels={$\hphantom{-5.}0$,2,4}]
\addplot[domain=-5:5, samples=100]{max(0,x)+ 0.1*min(0,x)};
\end{axis}
\end{tikzpicture}
\end{subfigure}
\end{figure}
\begin{tikzpicture}
\begin{axis}[enlargelimits=false]
\addplot [domain=-5:5, samples=101,unbounded coords=jump]{1/(1+exp(-x)};
\addplot[domain=-5:5, samples=100]{tanh(x)};
\addplot[domain=-5:5, samples=100]{max(0,x)};
\end{axis}
\end{tikzpicture}
\begin{tikzpicture}
\begin{axis}[enlargelimits=false]
\addplot[domain=-2*pi:2*pi, samples=100]{cos(deg(x))};
\end{axis}
\end{tikzpicture}
\end{document}
%%% Local Variables:
%%% mode: latex
%%% TeX-master: t
%%% End:

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@ -0,0 +1,78 @@
\pgfplotsset{
compat=1.11,
legend image code/.code={
\draw[mark repeat=2,mark phase=2]
plot coordinates {
(0cm,0cm)
(0.0cm,0cm) %% default is (0.3cm,0cm)
(0.0cm,0cm) %% default is (0.6cm,0cm)
};%
}
}
\begin{figure}
\begin{subfigure}[h]{\textwidth}
\begin{tikzpicture}
\begin{axis}[tick style = {draw = none}, width = \textwidth,
height = 0.6\textwidth, ymin = 0.92, legend style={at={(0.9825,0.75)},anchor=north east},
xlabel = {epoch}, ylabel = {Classification Accuracy}]
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Plots/Data/adagrad.log};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Plots/Data/adadelta.log};
\addplot table
[x=epoch, y=val_accuracy, col sep=comma, mark = none]
{Plots/Data/adam.log};
\addlegendentry{\footnotesize{ADAGRAD}}
\addlegendentry{\footnotesize{ADADELTA}}
\addlegendentry{\footnotesize{ADAM}}
\addlegendentry{SGD$_{0.01}$}
\end{axis}
\end{tikzpicture}
%\caption{Classification accuracy}
\vspace{.25cm}
\end{subfigure}
% \begin{subfigure}[b]{\textwidth}
% \begin{tikzpicture}
% \begin{axis}[tick style = {draw = none}, width = \textwidth,
% height = 0.6\textwidth, ymax = 0.5,
% xlabel = {epoch}, ylabel = {Error Measure\vphantom{y}},ytick ={0,0.1,0.2,0.3,0.4,0.45,0.5}, yticklabels =
% {0,0.1,0.2,0.3,0.4,\phantom{0.94},0.5}]
% \addplot table
% [x=epoch, y=val_loss, col sep=comma, mark = none] {Plots/Data/adagrad.log};
% \addplot table
% [x=epoch, y=val_loss, col sep=comma, mark = none] {Plots/Data/adadelta.log};
% \addplot table
% [x=epoch, y=val_loss, col sep=comma, mark = none] {Plots/Data/adam.log};
% \addlegendentry{\footnotesize{ADAGRAD}}
% \addlegendentry{\footnotesize{ADADELTA}}
% \addlegendentry{\footnotesize{ADAM}}
% \addlegendentry{SGD$_{0.01}$}
% \end{axis}
% \end{tikzpicture}
% \caption{Performance metrics during training}
% \vspace{.25cm}
% \end{subfigure}
\begin{subfigure}[b]{1.0\linewidth}
\begin{tabu} to \textwidth {@{} *3{X[c]}c*3{X[c]} @{}}
\multicolumn{3}{c}{Classification Accuracy}
&~&\multicolumn{3}{c}{Error Measure}
\\\cline{1-3}\cline{5-7}
ADAGRAD&ADADELTA&ADAM&&ADAGRAD&ADADELTA&ADAM
\\\cline{1-3}\cline{5-7}
1&1&1&&1&1&1
\end{tabu}
\caption{Performace metrics after 20 epochs}
\end{subfigure}
\caption[Performance comparison of training algorithms]{Classification accuracy on the test set and ...Performance metrics of the network given in ... trained
with different optimization algorithms}
\label{fig:comp_alg}
\end{figure}
%%% Local Variables:
%%% mode: latex
%%% TeX-master: "../main"
%%% End:

64
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@ -0,0 +1,64 @@
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1 x_i y_i x_d y_d x y
2 1 0 0 0.0815633019993375 0.095134925029757 0.0815633019993375 0.095134925029757
3 2 0.1 0.0998334166468282 -0.137539012603596 0.503920419784276 -0.137539012603596 0.503920419784276
4 3 0.2 0.198669330795061 0.219868163218743 0.32022289024623 0.219868163218743 0.32022289024623
5 4 0.3 0.29552020666134 0.378332723534869 0.474906286765401 0.378332723534869 0.474906286765401
6 5 0.4 0.389418342308651 0.286034335293811 0.422891394375764 0.215056588291437 0.412478430748051
7 6 0.5 0.479425538604203 -0.109871707385461 0.229661026779107 0.122574532557623 0.353221043330047
8 7 0.6 0.564642473395035 0.91036951450573 0.56079130435097 0.451160317716352 0.452893574072324
9 8 0.7 0.644217687237691 0.899001194675409 0.714355793051917 0.491731451724399 0.514477919331008
10 9 0.8 0.717356090899523 0.733791390723896 0.694085383523086 0.488943974889845 0.530054084580656
11 10 0.9 0.783326909627483 0.893642943873427 0.739792642916928 0.599785378272423 0.575149967162231
12 11 1 0.841470984807897 0.895913227983752 0.658288213778898 0.650886140047209 0.577618711891772
13 12 1.1 0.891207360061435 1.01252219752013 0.808981437684505 0.726263244907525 0.643161394030218
14 13 1.2 0.932039085967226 1.30930912337975 1.04111824066026 0.872590842152803 0.745714536528734
15 14 1.3 0.963558185417193 1.0448292335495 0.741250429230841 0.850147062957694 0.687171673021914
16 15 1.4 0.98544972998846 1.57369086195552 1.17277927321094 1.06520673597544 0.847936751231165
17 16 1.5 0.997494986604054 1.61427415976939 1.3908361301708 1.15616745244604 0.969474391592075
18 17 1.6 0.999573603041505 1.34409615749122 0.976992098566069 1.13543598207093 0.889434319996364
19 18 1.7 0.991664810452469 1.79278028030419 1.02939764179765 1.33272772191879 0.935067381106346
20 19 1.8 0.973847630878195 1.50721559744085 0.903076361857071 1.30862923824728 0.91665506605512
21 20 1.9 0.946300087687414 1.835014641556 0.830477479204284 1.45242210409837 0.889715842048808
22 21 2 0.909297426825682 1.98589997236352 0.887302138185342 1.56569111721857 0.901843632635883
23 22 2.1 0.863209366648874 2.31436634488224 0.890096618924313 1.73810390755555 0.899632162941341
24 23 2.2 0.80849640381959 2.14663445612581 0.697012453130415 1.77071083163663 0.831732978616874
25 24 2.3 0.74570521217672 2.17162372560288 0.614243640399509 1.84774268936257 0.787400621584077
26 25 2.4 0.675463180551151 2.2488591417345 0.447664288915269 1.93366609303299 0.707449056213168
27 26 2.5 0.598472144103957 2.56271588872389 0.553368843490625 2.08922735802261 0.702402440783529
28 27 2.6 0.515501371821464 2.60986205081511 0.503762006272682 2.17548673152621 0.657831176057599
29 28 2.7 0.42737988023383 2.47840649766003 0.215060732402894 2.20251747034638 0.533903400086802
30 29 2.8 0.334988150155905 2.99861119922542 0.28503285049582 2.43015164462239 0.512492561673074
31 30 2.9 0.239249329213982 3.09513467852082 0.245355736487949 2.54679545455398 0.461447717313721
32 31 3 0.141120008059867 2.86247369846558 0.0960140633436418 2.55274767368554 0.371740588261606
33 32 3.1 0.0415806624332905 2.79458017090243 -0.187923650913249 2.59422388058738 0.234694070506915
34 33 3.2 -0.0583741434275801 3.6498183243501 -0.186738431858275 2.9216851043241 0.173308072295566
35 34 3.3 -0.157745694143249 3.19424275971809 -0.221908035274934 2.86681135711315 0.101325637659584
36 35 3.4 -0.255541102026832 3.53166785156005 -0.295496842654793 3.03827050777863 0.0191967841533109
37 36 3.5 -0.35078322768962 3.53250700922714 -0.364585027403596 3.12709094619305 -0.0558446366563474
38 37 3.6 -0.442520443294852 3.52114271616751 -0.363845774016092 3.18702722489489 -0.10585071711408
39 38 3.7 -0.529836140908493 3.72033580551176 -0.386489608468821 3.31200591645168 -0.158195730190865
40 39 3.8 -0.611857890942719 4.0803717995796 -0.64779795182054 3.49862620703954 -0.284999326812438
41 40 3.9 -0.687766159183974 3.88351729419721 -0.604406622894426 3.51908925124143 -0.324791870057922
42 41 4 -0.756802495307928 3.9941257036697 -0.8061112437715 3.62222513609486 -0.438560071688316
43 42 4.1 -0.818277111064411 3.81674488816054 -0.548538951165239 3.63032709398802 -0.41285438330036
44 43 4.2 -0.871575772413588 4.47703348424544 -0.998992385231986 3.88581748102334 -0.592305016590357
45 44 4.3 -0.916165936749455 4.46179199544059 -0.969288921090897 3.96444243944485 -0.643076376622242
46 45 4.4 -0.951602073889516 4.15184730382548 -1.11987501275525 3.93838897981045 -0.743258835859858
47 46 4.5 -0.977530117665097 4.64522916494355 -0.772872365801468 4.15504805602606 -0.691414328153313
48 47 4.6 -0.993691003633465 4.68087925098283 -0.650422764094352 4.24176417425486 -0.675107584174976
49 48 4.7 -0.999923257564101 5.00475403211142 -0.922605880059771 4.41432228408005 -0.770625346502085
50 49 4.8 -0.996164608835841 4.71428836112322 -1.14280193223997 4.41279031790692 -0.861010494025717
51 50 4.9 -0.982452612624332 5.02115518218406 -0.9819618243158 4.57449352886454 -0.843786948015608
52 51 5 -0.958924274663138 4.92057344952522 -0.872931430146499 4.61418118503201 -0.836318916150308
53 52 5.1 -0.925814682327732 5.37277893732831 -0.91444926304078 4.81555148166217 -0.864686555983682
54 53 5.2 -0.883454655720153 5.19524942845082 -1.41169784739596 4.84152902094499 -1.03768305406186
55 54 5.3 -0.832267442223901 5.4432222181271 -0.726481337519931 4.98565483155961 -0.856094353978009
56 55 5.4 -0.772764487555987 4.98285013865449 -0.692803346852181 4.90897053115903 -0.838425020062396
57 56 5.5 -0.705540325570392 5.33298025214155 -0.343702005257262 5.0497327607228 -0.711573964373115
58 57 5.6 -0.631266637872321 5.49935694796791 -0.828968673188174 5.15036520204232 -0.816467931201244
59 58 5.7 -0.550685542597638 5.69204187550805 -0.481580461165225 5.26232964126231 -0.689500817105975
60 59 5.8 -0.464602179413757 5.84391772412888 -0.20453899468884 5.38069867877875 -0.564365367144995
61 60 5.9 -0.373876664830236 5.48166674139637 -0.597796931577294 5.3357436834558 -0.649913835818738
62 61 6 -0.279415498198926 5.77474590863769 -0.280234463056808 5.46956415981143 -0.524503219480344
63 62 6.1 -0.182162504272095 6.36764321572312 -0.0996286988755344 5.7169871104113 -0.422854073705143
64 63 6.2 -0.0830894028174964 6.46175133910451 -0.025702847911482 5.83540227044819 -0.355719019286555

45
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\begin{figure}
\centering
\begin{subfigure}[b]{0.49\textwidth}
\centering
\begin{adjustbox}{width=\textwidth, height=0.25\textheight}
\begin{tikzpicture}
\begin{axis}[tick style = {draw = none}, xticklabel = \empty,
yticklabel=\empty]
\addplot [mark options={scale = 0.7}, mark = o] table
[x=x_d,y=y_d, col sep = comma] {Plots/Data/sin_conv.csv};
\addplot [red, mark=x] table [x=x_i, y=y_i, col sep=comma, color ='black'] {Plots/Data/sin_conv.csv};
\end{axis}
\end{tikzpicture}
\end{adjustbox}
\caption{True position (\textcolor{red}{red}), distorted position data (black)}
\end{subfigure}
\begin{subfigure}[b]{0.49\textwidth}
\centering
\begin{adjustbox}{width=\textwidth, height=0.25\textheight}
\begin{tikzpicture}
\begin{axis}[tick style = {draw = none}, xticklabel = \empty,
yticklabel=\empty]
\addplot [mark options={scale = 0.7}, mark = o] table [x=x,y=y, col
sep = comma] {Plots/Data/sin_conv.csv};
\addplot [red, mark=x] table [x=x_i, y=y_i, col sep=comma, color ='black'] {Plots/Data/sin_conv.csv};
\end{axis}
\end{tikzpicture}
\end{adjustbox}
\caption{True position (\textcolor{red}{red}), filtered position data (black)}
\end{subfigure}
\caption[Signal smoothing using convolution]{Example for noise reduction using convolution with simulated
positional data. As filter
$g(i)=\left(\nicefrac{1}{3},\nicefrac{1}{4},\nicefrac{1}{5},\nicefrac{1}{6},\nicefrac{1}{20}\right)_{(i-1)}$
is chosen and applied to the $x$ and $y$ coordinate
data seperately. The convolution of both signals with $g$
improves the MSE of the positions from 0.196 to 0.170 and
visibly smoothes the data.
}
\label{fig:sin_conv}
\end{figure}
%%% Local Variables:
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335
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\newpage \newpage
\begin{appendices} \begin{appendices}
\counterwithin{lstfloat}{section} \section{Proofs for sone Lemmata in ...}
\section{Notes on Proofs of Lemmata in Section~\ref{sec:conv}} In the following there will be proofs for some important Lemmata in
\label{appendix:proofs} Section~\ref{sec:theo38}. Further proofs not discussed here can be
Contrary to \textcite{heiss2019} we do not make the distinction between $f_+$ and found in \textcite{heiss2019}
$f_-$. \begin{Theorem}[Proof of Lemma~\ref{theo38}]
This results in some alterations in the proofs being necessary. In \end{Theorem}
the following the affected proofs and the required changes are given.
% Because of that slight alterations are needed in the proofs of
% .. auxiliary lemmata.
% Alterations that go beyond substituting $F_{+-}^{}$
% As the proofs are ... for the most part only
% the alterations needed are specified.
\begin{Lemma}[$\frac{w^{*,\tilde{\lambda}}_k}{v_k}\approx\mathcal{O}(\frac{1}{n})$]
For any $\lambda > 0$ and training data $(x_i^{\text{train}},
y_i^{\text{train}}) \in \mathbb{R}^2, \, i \in
% In the following there will be proofs for some important Lemmata in \left\{1,\dots,N\right\}$, we have
% Section~\ref{sec:theo38}. Further proofs not discussed here can be
% found in \textcite{heiss2019}
% The proves in this section are based on \textcite{heiss2019}. Slight
% alterations have been made to accommodate for not splitting $f$ into
% $f_+$ and $f_-$.
% \begin{Theorem}[Proof of Lemma~\ref{theo38}]
% \end{Theorem}
% \begin{Lemma}[$\frac{w^{*,\tilde{\lambda}}_k}{v_k}\approx\mathcal{O}(\frac{1}{n})$]
% For any $\lambda > 0$ and training data $(x_i^{\text{train}},
% y_i^{\text{train}}) \in \mathbb{R}^2, \, i \in
% \left\{1,\dots,N\right\}$, we have
% \[
% \max_{k \in \left\{1,\dots,n\right\}} \frac{w^{*,
% \tilde{\lambda}}_k}{v_k} = \po_{n\to\infty}
% \]
% \end{Lemma}
\begin{Proof}[Heiss, Teichmann, and Wutte (2019, Lemma A.9)]~\\\noindent
\label{proof:lem9}
With $\tilde{\lambda} \coloneqq \lambda n g(0)$ Lemma~\ref{lem:cnvh} follows
analogously when considering $\tilde{w}$, $f_g^{*, \lambda}$, and $h_k$
instead of $\tilde{w}^+$, $f_{g,+}^{*, \lambda}$, and $\bar{h}_k$.
Consider $\kappa = \left\{1, \dots, n \right\}$ for $n$ nodes
instead of $\kappa^+$. With $h_k = \frac{1}{n g_\xi(\xi_n)}$
instead of $\bar{h}_k$
and \[
\mathbb{E} \left[\abs{\left\{m \in \kappa : \xi_m \in [\delta l,
\delta(l+1))\right\}}\right] = n \int_{\delta
l}^{\delta(l+1)}g_\xi (x) dx \approx n (\delta g_\xi(\delta l)
\pm \delta \tilde{\varepsilon}).
\]
% \[
% \sum_{k \in \kappa : \xi_k < T} \varphi(\xi_k, v_k)
% h_{k,n} = \sum_{\substack{l \in \mathbb{Z} \\ [\delta l, \delta
% (l+1)) \in [C_{g_\xi}^l,\min\{C_{g_\xi}^u, T \}]}}
% \left(\sum_{\substack{k \in \kappa \\ \xi_k \in
% [\delta l , \delta(l+1))}} \varphi(\xi_k, v_k)
% h_{k,n}\right) \approx
% \]
% \[
% \approx \sum_{\substack{l \in \mathbb{Z} \\ [\delta l, \delta
% (l+1)) \in [C_{g_\xi}^l,\min\{C_{g_\xi}^u, T \}]}}
% \left(\sum_{\substack{k \in \kappa \\ \xi_k \in
% [\delta l , \delta(l+1))}} \left(\varphi(\delta l, v_k)
% \frac{1}{n g_\xi (\delta l)} \pm \frac{\varepsilon}{n}\right)
% \frac{\abs{\left\{m \in \kappa : \xi_m \in [\delta l,
% \delta(l+1))\right\}}}{\abs{\left\{m \in \kappa : \xi_m
% \in [\delta l, \delta(l+1))\right\}}}\right)
% \]
% \[
% \approx \sum_{\substack{l \in \mathbb{Z} \\ [\delta l, \delta
% (l+1)) \in [C_{g_\xi}^l,\min\{C_{g_\xi}^u, T \}]}}
% \left(\frac{\sum_{\substack{k \in \kappa \\ \xi_k \in
% [\delta l , \delta(l+1))}}\varphi(\delta l,
% v_k)}{\abs{\left\{m \in \kappa : \xi_m
% \in [\delta l, \delta(l+1))\right\}}}
% \frac{\abs{\left\{m \in \kappa : \xi_m \in [\delta l,
% \delta(l+1))\right\}}}{n g_\xi (\delta l)}\right) \pm \varepsilon
% \]
% The amount of kinks in a given interval of length $\delta$ follows a
% binomial distribution,
% \[
% \mathbb{E} \left[\abs{\left\{m \in \kappa : \xi_m \in [\delta l,
% \delta(l+1))\right\}}\right] = n \int_{\delta
% l}^{\delta(l+1)}g_\xi (x) dx \approx n (\delta g_\xi(\delta l)
% \pm \delta \tilde{\varepsilon}),
% \]
% for any $\delta \leq \delta(\varepsilon, \tilde{\varepsilon})$, since $g_\xi$ is uniformly continuous on its
% support by Assumption..
% As the distribution of $v$ is continuous as well we get that
% $\mathcal{L}(v_k) = \mathcal{L} v| \xi = \delta l) \forall k \in
% \kappa : \xi_k \in [\delta l, \delta(l+1))$ for $\delta \leq
% \delta(\varepsilon, \tilde{\varepsilon})$. Thus we get with the law of
% large numbers
% \begin{align*}
% &\sum_{k \in \kappa : \xi_k < T} \varphi(\xi_k, v_k)
% h_{k,n} \approx\\
% &\approx \sum_{\substack{l \in \mathbb{Z} \\ [\delta l, \delta
% (l+1)) \in [C_{g_\xi}^l,\min\{C_{g_\xi}^u, T
% \}]}}\left(\mathbb{E}[\phi(\xi, v)|\xi=\delta l]
% \stackrel{\mathbb{P}}{\pm}\right) \delta \left(1 \pm
% \frac{\tilde{\varepsilon}}{g_\xi(\delta l)}\right) \pm \varepsilon
% \\
% &\approx \left(\sum_{\substack{l \in \mathbb{Z} \\ [\delta
% l, \delta
% (l+1)) \in [C_{g_\xi}^l,\min\{C_{g_\xi}^u, T
% \}]}}\mathbb{E}[\phi(\xi, v)|\xi=\delta l] \delta
% \stackrel{\mathbb{P}}{\pm}\tilde{\tilde{\varepsilon}}
% \abs{C_{g_\xi}^u - C_{g_\xi}^l}
% \right)\\
% &\phantom{\approx}\cdot \left(1 \pm
% \frac{\tilde{\varepsilon}}{g_\xi(\delta l)}\right) \pm \varepsilon
% \end{align*}
\end{Proof}
% \begin{Lemma}[($L(f_n) \to L(f)$), Heiss, Teichmann, and
% Wutte (2019, Lemma A.11)]
% For any data $(x_i^{\text{train}}, y_i^{\text{train}}) \in
% \mathbb{R}^2, i \in \left\{1,\dots,N\right\}$, let $(f_n)_{n \in
% \mathbb{N}}$ be a sequence of functions that converges point-wise
% in probability to a function $f : \mathbb{R}\to\mathbb{R}$, then the
% loss $L$ of $f_n$ converges is probability to $L(f)$ as $n$ tends to
% infinity,
% \[
% \plimn L(f_n) = L(f).
% \]
% \proof Vgl. ...
% \end{Lemma}
\begin{Proof}[Heiss, Teichmann, and Wutte (2019, Lemma A.12)]~\\\noindent
\label{proof:lem12}
With $\tilde{\lambda} \coloneqq \lambda n g(0)$ Lemma~\ref{lem:s2} follows
analogously when considering $\tilde{w}$, $f_g^{*, \lambda}$, and $h_k$
instead of $\tilde{w}^+$, $f_{g,+}^{*, \lambda}$, and $\bar{h}_k$.
% We start by showing that
% \[
% \plimn \tilde{\lambda} \norm{\tilde{w}}_2^2 = \lambda g(0)
% \left(\int \frac{\left(f_g^{*,\lambda''}\right)^2}{g(x)} dx\right)
% \]
% With the definitions of $\tilde{w}$, $\tilde{\lambda}$ and
% $h$ we have
% \begin{align*}
% \tilde{\lambda} \norm{\tilde{w}}_2^2
% &= \tilde{\lambda} \sum_{k \in
% \kappa}\left(f_g^{*,\lambda''}(\xi_k) \frac{h_k
% v_k}{\mathbb{E}v^2|\xi = \xi_k]}\right)^2\\
% &= \tilde{\lambda} \sum_{k \in
% \kappa}\left(\left(f_g^{*,\lambda''}\right)^2(\xi_k) \frac{h_k
% v_k^2}{\mathbb{E}v^2|\xi = \xi_k]}\right) h_k\\
% & = \lambda g(0) \sum_{k \in
% \kappa}\left(\left(f_g^{*,\lambda''}\right)^2(\xi_k)\frac{v_k^2}{g_\xi(\xi_k)\mathbb{E}
% [v^2|\xi=\xi_k]}\right)h_k.
% \end{align*}
% By using Lemma~\ref{lem} with $\phi(x,y) =
% \left(f_g^{*,\lambda''}\right)^2(x)\frac{y^2}{g_\xi(\xi)\mathbb{E}[v^2|\xi=y]}$
% this converges to
% \begin{align*}
% &\plimn \tilde{\lambda}\norm{\tilde{w}}_2^2 = \\
% &=\lambda
% g_\xi(0)\mathbb{E}[v^2|\xi=0]\int_{\supp{g_\xi}}\mathbb{E}\left[
% \left(f_g^{*,\lambda''}\right)^2(\xi)\frac{v^2}{
% g_\xi(\xi)\mathbb{E}[v^2|\xi=x]^2}\Big{|} \xi = x\right]dx\\
% &=\lambda g_\xi(0) \mathbb{E}[v^2|\xi=0] \int_{\supp{g_xi}}
% \frac{\left(f_g^{*,\lambda''}\right)^2 (x)}{g_\xi(x)
% \mathbb{E}[v^2|\xi=x]} dx \\
% &=\lambda g(0) \int_{\supp{g_\xi}} \frac{\left(f_g^{*,\lambda''}\right)^2}{g(x)}dx.
% \end{align*}
\end{Proof}
\begin{Proof}[Heiss, Teichmann, and Wutte (2019, Lemma A.14)]~\\\noindent
\label{proof:lem14}
Substitute $F_{+-}^{\lambda, g}\left(f_{g,+}^{*,\lambda},
f_{g,-}^{*,\lambda}\right)$ with $F^{\lambda,g}\left(f_g^{*,\lambda}\right)$.
\end{Proof}
% \begin{Lemma}[Heiss, Teichmann, and
% Wutte (2019, Lemma A.13)]
% Using the notation of Definition .. and ... the following statement
% holds:
% $\forall \varepsilon \in \mathbb{R}_{>0} : \exists \delta \in
% \mathbb{R}_{>0} : \forall \omega \in \Omega : \forall l, l' \in
% \left\{1,\dots,N\right\} : \forall n \in \mathbb{N}$
% \[
% \left(\abs{\xi_l(\omega) - \xi_{l'}(\omega)} < \delta \wedge
% \text{sign}(v_l(\omega)) = \text{sign}(v_{l'}(\omega))\right)
% \implies \abs{\frac{w_l^{*, \tilde{\lambda}}(\omega)}{v_l(\omega)}
% - \frac{w_{l'}^{*, \tilde{\lambda}}(\omega)}{v_{l'}(\omega)}} <
% \frac{\varepsilon}{n},
% \]
% if we assume that $v_k$ is never zero.
% \proof given in ..
% \end{Lemma}
% \begin{Lemma}[$\frac{w^{*,\tilde{\lambda}}}{v} \approx
% \mathcal{O}(\frac{1}{n})$, Heiss, Teichmann, and
% Wutte (2019, Lemma A.14)]
% For any $\lambda > 0$ and data $(x_i^{\text{train}},
% y_i^{\text{train}}) \in \mathbb{R}^2, i\in
% \left\{1,\dots,\right\}$, we have
% \[
% \forall P \in (0,1) : \exists C \in \mathbb{R}_{>0} : \exists
% n_0 \in \mathbb{N} : \forall n > n_0 : \mathbb{P}
% \left[\max_{k\in \left\{1,\dots,n\right\}}
% \frac{w_k^{*,\tilde{\lambda}}}{v_k} < C
% \frac{1}{n}\right] > P
% % \max_{k\in \left\{1,\dots,n\right\}}
% % \frac{w_k^{*,\tilde{\lambda}}}{v_k} = \plimn
% \]
% \proof
% Let $k^*_+ \in \argmax_{k\in
% \left\{1,\dots,n\right\}}\frac{w^{*,\tilde{\lambda}}}{v_k} : v_k
% > 0$ and $k^*_- \in \argmax_{k\in
% \left\{1,\dots,n\right\}}\frac{w^{*,\tilde{\lambda}}}{v_k} : v_k
% < 0$. W.l.o.g. assume $\frac{w_{k_+^*}^2}{v_{k_+^*}^2} \geq
% \frac{w_{k_-^*}^2}{v_{k_-^*}^2}$
% \begin{align*}
% \frac{F^{\lambda,
% g}\left(f^{*,\lambda}_g\right)}{\tilde{\lambda}}
% \makebox[2cm][c]{$\stackrel{\mathbb{P}}{\geq}$}
% & \frac{1}{2 \tilde{\lambda}}
% F_n^{\tilde{\lambda}}\left(\mathcal{RN}^{*,\tilde{\lambda}}\right)
% = \frac{1}{2 \tilde{\lambda}}\left[\sum ... + \tilde{\lambda} \norm{w}_2^2\right]
% \\
% \makebox[2cm][c]{$\geq$}
% & \frac{1}{2}\left( \sum_{\substack{k: v_k
% > 0 \\\xi_k\in(\xi_{k^*}, \xi_{k^*}
% + \delta)}} \left(w_k^{*,\tilde{\lambda}}\right)^2 +
% \sum_{\substack{k: v_k < 0 \\\xi_k\in(\xi_{k^*}, \xi_{k^*}
% + \delta)}} \left(w_k^{*,\tilde{\lambda}}\right)^2\right) \\
% \makebox[2cm][c]{$\overset{\text{Lem. A.6}}{\underset{\delta \text{
% small enough}}{\geq}} $}
% &
% \frac{1}{4}\left(\left(\frac{w_{k_+^*}^{*,\tilde{\lambda}}}
% {v_{k_+^*}}\right)^2\sum_{\substack{k:
% v_k > 0 \\\xi_k\in(\xi_{k^*}, \xi_{k^*} + \delta)}}v_k^2 +
% \left(\frac{w_{k_-^*}^{*,\tilde{\lambda}}}{v_{k_-^*}}\right)^2
% \sum_{\substack{k:
% v_k < 0 \\\xi_k\in(\xi_{k^*}, \xi_{k^*} +
% \delta)}}v_k^2\right)\\
% \makebox[2cm][c]{$\stackrel{\mathbb{P}}{\geq}$}
% & \frac{1}{8}
% \left(\frac{w_{k_+^*}^{*,\tilde{\lambda}}}{v_{k^*}}\right)^2
% n \delta g_\xi(\xi_{k_+^*}) \mathbb{P}(v_k
% >0)\mathbb{E}[v_k^2|\xi_k = \xi_{k^*_+}]
% \end{align*}
% \end{Lemma}
\begin{Proof}[Heiss, Teichmann, and Wutte (2019, Lemma A.15)]~\\\noindent
\label{proof:lem15}
Consider $\mathcal{RN}^{*,\tilde{\lambda}}$,
$f^{w^{*,\tilde{\lambda}}}$, and $\kappa = \left\{1, \dots, n
\right\}$ instead of $\mathcal{RN}_+^{*,\tilde{\lambda}}$,
$f_+^{w^{*,\tilde{\lambda}}}$, and $\kappa^+$.
Assuming w.l.o.g. $max_{k \in
\kappa^+}\abs{\frac{w_k^{*,\tilde{\lambda}}}{v_k}} \geq max_{k \in
\kappa^-}\abs{\frac{w_k^{*,\tilde{\lambda}}}{v_k}}$
Lemma~ref{lem:s3} follows analogously by multiplying (58b) with two.
\end{Proof}
\begin{Proof}[Heiss, Teichmann, and Wutte (2019, Lemma
A.16)]~\\\noindent
\label{proof:lem16}
As we are considering $F^{\lambda,g}$ instead of
$F^{\lambda,g}_{+-}$ we need to substitute $2\lambda g(0)$ with
$\lambda g(0)$
and thus get
\[ \[
\left(f^{w^{*,\tilde{\lambda}}}\right)''(x) \approx \max_{k \in \left\{1,\dots,n\right\}} \frac{w^{*,
\frac{w_{l_x}^{*,\tilde{\lambda}}}{v_{l_x}} n g_\xi(x) \tilde{\lambda}}_k}{v_k} = \po_{n\to\infty}
\mathbb{E}\left[v_k^2|\xi_k = x\right] \stackrel{\mathbb{P}}{\pm} \varepsilon_3
\] \]
and use this to follow
\[
\lambda g(0)
\int_{\supp(g)}\hspace{-0.15cm}\frac{\left(\left(f^{w^{*,\tilde{\lambda}}}\right)''(x)\right)^2}{g(0)}dx
\approx \tilde{\lambda} n
\int_{\supp(g)}\left(\frac{w_{l_x}^{*,\tilde{\lambda}}}{v_{l_x}}\right)^2 \hspace{-0.1cm}
g_xi(x) \mathbb{E}\left[v_k^2|\xi_k=x\right]dx
\]
Analogous to the proof of \textcite{heiss2019} we get
\begin{align*}
\tilde{\lambda} \sum_{k \in \kappa}
\left(w_k^{*,\tilde{\lambda}}\right)^2
&= \tilde{\lambda} \sum_{k \in \kappa^+}
\left(w_k^{*,\tilde{\lambda}}\right)^2 + \tilde{\lambda} \sum_{k \in \kappa^-}
\left(w_k^{*,\tilde{\lambda}}\right)^2 \\
&\approx \left(\mathbb{P}[v_k <0] + \mathbb{P}[v_k >0]\right)\\
&\phantom{=}
\int_{\supp(g_xi)}
\left(\frac{w_{l_x}^{*,\tilde{\lambda}}}{v_{l_x}}\right)^2
g_\xi(x) \mathbb{E}\left[v_k^2|\xi_k = x\right] dx
\stackrel{\mathbb{P}}{\pm} \varepsilon_9 \\
&= \int_{\supp{g_xi}}
\left(\frac{w_{l_x}^{*,\tilde{\lambda}}}{v_{l_x}}\right)^2
g_\xi(x) \mathbb{E}\left[v_k^2|\xi_k = x\right] dx
\stackrel{\mathbb{P}}{\pm} \varepsilon_9.
\end{align*}
With these transformations Lemma~\ref{lem:s4} follows analogously.
\end{Proof}
\begin{Proof}[Heiss, Teichmann, and Wutte (2019, Lemma A.19)]~\\\noindent
\label{proof:lem19}
The proof works analogously if $F_{+-}^{\lambda,g}$ is substituted
by
\begin{align*}
F_{+-}^{\lambda,g '}(f_+, f_-) =
& \sum_{i =
1}^N \left(f(x_i^{\text{train}}) -
y_i^{\text{train}}\right)^2 \\
& + \lambda g(0) \left(\int_{\supp(g)}\frac{\left(f_+''(x)\right)^2}{g(x)}
dx + \int_{\supp(g)}\frac{\left(f''_-(x)\right)^2}{g(x)}
dx\right).
\end{align*}
As for $f^n = f_+^n + f_-^n$ such that $\supp(f_+^n) \cap \supp(f_-^n) =
\emptyset$ and $h = h_+ + h_-$ such that $\supp(h_+) \cap \supp(h_-) =
\emptyset$ it holds
\[
\plimn F^{\lambda, g}(f^n) = F^{\lambda, g}(h) \implies
\plimn F_{+-}^{\lambda,g '}(f_+,f_-) = F_{+-}^{\lambda,g '}(h_+,h_-),
\]
and all functions can be split in two functions with disjoint support,
Lemma~\ref{lem:s7} follows.
\end{Proof}
\input{Appendix_code.tex}
\end{Lemma}
\end{appendices} \end{appendices}

183
TeX/bibliograpy.bib
View File

@ -2,12 +2,15 @@
series = {arXiv}, series = {arXiv},
author = {Heiss, Jakob and Teichmann, Josef and Wutte, Hanna}, author = {Heiss, Jakob and Teichmann, Josef and Wutte, Hanna},
publisher = {Cornell University}, publisher = {Cornell University},
year = {2019}, copyright = {In Copyright - Non-Commercial Use Permitted}, year = {2019},
language = {en},
copyright = {In Copyright - Non-Commercial Use Permitted},
keywords = {early stopping; implicit regularization; machine learning; neural networks; spline; regression; gradient descent; artificial intelligence}, keywords = {early stopping; implicit regularization; machine learning; neural networks; spline; regression; gradient descent; artificial intelligence},
size = {53 p.}, size = {53 p.},
abstract = {Today, various forms of neural networks are trained to perform approximation tasks in many fields. However, the solutions obtained are not fully understood. Empirical results suggest that typical training algorithms favor regularized solutions.These observations motivate us to analyze properties of the solutions found by gradient descent initialized close to zero, that is frequently employed to perform the training task. As a starting point, we consider one dimensional (shallow) ReLU neural networks in which weights are chosen randomly and only the terminal layer is trained. We show that the resulting solution converges to the smooth spline interpolation of the training data as the number of hidden nodes tends to infinity. Moreover, we derive a correspondence between the early stopped gradient descent and the smoothing spline regression. This might give valuable insight on the properties of the solutions obtained using gradient descent methods in general settings.},
DOI = {10.3929/ethz-b-000402003}, DOI = {10.3929/ethz-b-000402003},
title = {How Implicit Regularization of Neural Networks Affects the Learned Function – Part I}, title = {How Implicit Regularization of Neural Networks Affects the Learned Function – Part I},
PAGES = {1911.02903}, PAGES = {1911.02903}
} }
@article{Dropout, @article{Dropout,
@ -18,7 +21,7 @@
volume = 15, volume = 15,
number = 56, number = 56,
pages = {1929-1958}, pages = {1929-1958},
Comment url = {http://jmlr.org/papers/v15/srivastava14a.html} url = {http://jmlr.org/papers/v15/srivastava14a.html}
} }
@article{ADADELTA, @article{ADADELTA,
@ -27,10 +30,12 @@
journal = {CoRR}, journal = {CoRR},
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Comment url = {http://arxiv.org/abs/1212.5701}, url = {http://arxiv.org/abs/1212.5701},
archivePrefix = {arXiv}, archivePrefix = {arXiv},
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timestamp = {Mon, 13 Aug 2018 16:45:57 +0200}, timestamp = {Mon, 13 Aug 2018 16:45:57 +0200},
biburl = {https://dblp.org/rec/journals/corr/abs-1212-5701.bib},
bibsource = {dblp computer science bibliography, https://dblp.org}
} }
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@ -45,31 +50,45 @@ day={01},
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number={6088}, number={6088},
pages={533-536}, pages={533-536},
abstract={We describe a new learning procedure, back-propagation, for networks of neurone-like units. The procedure repeatedly adjusts the weights of the connections in the network so as to minimize a measure of the difference between the actual output vector of the net and the desired output vector. As a result of the weight adjustments, internal `hidden' units which are not part of the input or output come to represent important features of the task domain, and the regularities in the task are captured by the interactions of these units. The ability to create useful new features distinguishes back-propagation from earlier, simpler methods such as the perceptron-convergence procedure1.},
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@ -98,15 +117,6 @@ numpages = {39}
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journal = {CoRR}, journal = {CoRR},
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year = {2014}, year = {2014},
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archivePrefix = {arXiv}, archivePrefix = {arXiv},
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timestamp = {Mon, 22 Jul 2019 13:15:46 +0200}, timestamp = {Mon, 22 Jul 2019 13:15:46 +0200},
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bibsource = {dblp computer science bibliography, https://dblp.org} bibsource = {dblp computer science bibliography, https://dblp.org}
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@ -135,10 +146,12 @@ journal = {NIPS}
journal = {CoRR}, journal = {CoRR},
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year = {2012}, year = {2012},
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1289
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68
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@ -1,74 +1,6 @@
\section{Introduction} \section{Introduction}
Neural networks have become a widely used model for a plethora of
applications.
They are an attractive choice as they are able to
model complex data with relatively little additional input to the
training data needed.
Additionally, as the price of parallelized computing
power in the form of graphics processing unit has decreased drastically over the last
years, it has become far more accessible to train and use large
neural networks.
Furthermore, highly optimized and parallelized frameworks for tensor
operations have been developed.
With these frameworks, such as TensorFlow and PyTorch, building neural
networks has become a much more straightforward process.
% Furthermore, with the development of highly optimized and
% parallelized implementations of mathematical operations needed for
% neural networks, such as TensorFlow or PyTorch, building neural network
% models has become a much more straightforward process.
% For example the flagship consumer GPU GeForce RTX 3080 of NVIDIA's current
% generation has 5.888 CUDS cores at a ... price of 799 Euro compared
% to the last generations flagship GeForce RTX 2080 Ti with 4352 CUDA
% cores at a ... price of 1259 Euro. These CUDA cores are computing
% cores specialized for tensor operations, which are necessary in
% fitting and using neural networks.
In this thesis we want to get an understanding of the behavior of neural %
networks and
how we can use them for problems with a complex relationship between
in- and output.
In Section 2 we introduce the mathematical construct of neural
networks and how to fit them to training data.
To gain some insight about the learned function,
we examine a simple class of neural networks that contain only one
hidden layer.
In Section~\ref{sec:shallownn} we proof a relation between such networks and
functions that minimize the distance to training data
with respect to its second derivative.
An interesting application of neural networks is the task of
classifying images.
However, for such complex problems the number of parameters in fully
connected neural networks can exceed what is
feasible for training.
In Section~\ref{sec:cnn} we explore the addition of convolution to neural
networks to reduce the number of parameters.
As these large networks are commonly trained using gradient decent
algorithms we compare the performance of different algorithms based on
gradient descent in Section~4.4.
% and
% show that it is beneficial to only use small subsets of the training
% data in each iteration rather than using the whole data set to update
% the parameters.
Most statistical models especially these with large amounts of
trainable parameters can struggle with overfitting the data.
In Section 4.5 we examine the impact of two measures designed to combat
overfitting.
In some applications such as working with medical images the data
available for training can be scarce, which results in the networks
being prone to overfitting.
As these are interesting applications of neural networks we examine
the benefit of the measures to combat overfitting for
scenarios with limited amounts of training data.
% As in some applications such as medical imaging one might be limited
% to very small training data we study the impact of two measures in
% improving the accuracy in such a case by trying to ... the model from
% overfitting the data.

354
TeX/introduction_nn.tex
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@ -1,26 +1,19 @@
\section{Introduction to Neural Networks} \section{Introduction to Neural Networks}
This chapter is based on \textcite[Chapter~6]{Goodfellow} and \textcite{Haykin}. Neural Networks (NN) are a mathematical construct inspired by the
... of brains in mammals. It consists of an array of neurons that
Neural Networks are a mathematical construct inspired by the receive inputs and compute a accumulated output. These neurons are
structure of brains in mammals. They consist of an array of neurons that arranged in layers, with one input and output layer and a arbirtary
receive inputs and compute an accumulated output. These neurons are amount of hidden layer between them.
arranged in layers, with one input and output layer The amount of neurons in the in- and output layers correspond to the
and an arbitrary
amount of hidden layers between them.
The number of neurons in the in- and output layers correspond to the
desired dimensions of in- and outputs of the model. desired dimensions of in- and outputs of the model.
In conventional neural networks the information is passed ... from the
In conventional neural networks, the information is fed forward from the input layer towards the output layer hence they are often called feed
input layer towards the output layer, hence they are often called forward networks. Each neuron in a layer has the outputs of all
feed forward networks. Each neuron in a layer has the outputs of all neurons in the preceding layer as input (fully connected). A
neurons in the preceding layer as input and computes an accumulated illustration of a example neuronal network is given in
value from these (fully connected). Figure~\ref{fig:nn} and one of a neuron in Figure~\ref{fig:neuron}
% An illustration of an example neural network is given in
% Figure~\ref{fig:nn} and one of a neuron in Figure~\ref{fig:neuron}.
Illustrations of a neural network and the structure of a neuron are given
in Figure~\ref{fig:nn} and Figure~\ref{fig:neuron}.
\tikzset{% \tikzset{%
every neuron/.style={ every neuron/.style={
@ -46,16 +39,16 @@ in Figure~\ref{fig:nn} and Figure~\ref{fig:neuron}.
{\arrow[scale=1.5,>=stealth]{>}}},postaction={decorate}}} {\arrow[scale=1.5,>=stealth]{>}}},postaction={decorate}}}
\foreach \m/\l [count=\y] in {1,2,3,missing,4} \foreach \m/\l [count=\y] in {1,2,3,missing,4}
\node [every neuron/.try, neuron \m/.try] (input-\m) at (0,2.55-\y*0.85) {}; \node [every neuron/.try, neuron \m/.try] (input-\m) at (0,2.5-\y) {};
\foreach \m [count=\y] in {1,missing,2} \foreach \m [count=\y] in {1,missing,2}
\node [every neuron/.try, neuron \m/.try ] (hidden1-\m) at (2.5,2.5-\y*1.25) {}; \node [every neuron/.try, neuron \m/.try ] (hidden1-\m) at (2,2-\y*1.25) {};
\foreach \m [count=\y] in {1,missing,2} \foreach \m [count=\y] in {1,missing,2}
\node [every neuron/.try, neuron \m/.try ] (hidden2-\m) at (5,2.5-\y*1.25) {}; \node [every neuron/.try, neuron \m/.try ] (hidden2-\m) at (5,2-\y*1.25) {};
\foreach \m [count=\y] in {1,missing,2} \foreach \m [count=\y] in {1,missing,2}
\node [every neuron/.try, neuron \m/.try ] (output-\m) at (7,1.5-\y*0.75) {}; \node [every neuron/.try, neuron \m/.try ] (output-\m) at (7,1.5-\y) {};
\foreach \l [count=\i] in {1,2,3,d_i} \foreach \l [count=\i] in {1,2,3,d_i}
\draw [myptr] (input-\i)+(-1,0) -- (input-\i) \draw [myptr] (input-\i)+(-1,0) -- (input-\i)
@ -91,7 +84,7 @@ in Figure~\ref{fig:nn} and Figure~\ref{fig:neuron}.
\node[fill=white,scale=1.5,inner xsep=10pt,inner ysep=10mm] at ($(hidden1-1)!.5!(hidden2-2)$) {$\dots$}; \node[fill=white,scale=1.5,inner xsep=10pt,inner ysep=10mm] at ($(hidden1-1)!.5!(hidden2-2)$) {$\dots$};
\end{tikzpicture}}%} \end{tikzpicture}}%}
\caption[Illustration of a Neural Network]{Illustration of a neural network with $d_i$ inputs, $l$ \caption[Illustration of a neural network]{Illustration of a neural network with $d_i$ inputs, $l$
hidden layers with $n_{\cdot}$ nodes in each layer, as well as hidden layers with $n_{\cdot}$ nodes in each layer, as well as
$d_o$ outputs. $d_o$ outputs.
} }
@ -100,62 +93,102 @@ in Figure~\ref{fig:nn} and Figure~\ref{fig:neuron}.
\subsection{Nonlinearity of Neural Networks} \subsection{Nonlinearity of Neural Networks}
The arguably most important feature of neural networks which sets them The arguably most important feature of neural networks that sets them
apart from linear models is the activation function implemented in the apart from linear models is the activation function implemented in the
neurons. As illustrated in Figure~\ref{fig:neuron} on the weighted sum of the neurons. As seen in Figure~\ref{fig:neuron} on the weighted sum of the
inputs an activation function $\sigma$ is applied resulting in the inputs a activation function $\sigma$ is applied in order to obtain
output of the $k$-th neuron in a layer $l$ with $m$ nodes in layer $l-1$ the output resulting in the output of the $k$-th. neuron in a layer
being given by being given by
\begin{align*} \[
o_{l,k} = \sigma\left(b_{l,k} + \sum_{j=1}^{m} w_{l,k,j} o_k = \sigma\left(b_k + \sum_{j=1}^m w_{k,j} i_j\right)
o_{l-1,j}\right), \]
\end{align*} for weights $w_{k,j}$ and biases $b_k$.
for weights $w_{l,k,j}$ and biases $b_{l,k}$. For a network with $L$
hidden layers and inputs $o_{0}$ the final outputs of the network
are thus given by $o_{L+1}$.
The activation function is usually chosen nonlinear (a linear one The activation function is usually chosen nonlinear (a linear one
would result in the entire network collapsing into a linear model) which would result in the entire model collapsing into a linear one\todo{beweis?}) which
allows it to better model data where the relation of in- and output is allows it to better model data where the relation of in- and output is
of nonlinear nature. of nonlinear nature.
There are two types of activation functions, saturating and There are two types of activation functions, saturating and not
non-saturating ones. Popular examples for the former are sigmoid saturating ones. Popular examples for the former are sigmoid
functions where most commonly the standard logistic function or tangens functions where most commonly the standard logisitc function or tangen
hyperbolicus are used hyperbolicus are used
as they have easy to compute derivatives which is desirable for as they have easy to compute derivatives which is desirable for gradient
gradient-based optimization algorithms. The standard logistic function based optimization algorithms. The standard logistic function (often
(often simply referred to as sigmoid function) is given by referred to simply as sigmoid function) is given by
\[ \[
f(x) = \frac{1}{1+e^{-x}} f(x) = \frac{1}{1+e^{-x}}
\] \]
and has a realm of $[0,1]$. The tangens hyperbolicus is given by and has a realm of $[0,1]$. Its usage as an activation function is
motivated by modeling neurons which
are close to deactive until a certain threshold where they grow in
intensity until they are fully
active, which is similar to the behavior of neurons in
brains\todo{besser schreiben}. The tangens hyperbolicus is given by
\[ \[
\tanh(x) = \frac{2}{e^{2x}+1} \tanh(x) = \frac{2}{e^{2x}+1}
\] \]
and has a realm of $[-1,1]$. Both functions result in neurons that are
close to inactive until a certain threshold is reached where they grow
until saturation.
The downside of these saturating activation functions is, that their
derivatives are close to zero on most of their realm, only assuming
larger values in proximity to zero.
This can hinder the progress of gradient-based methods.
The non-saturating activation functions commonly used are the rectified The downside of these saturating activation functions is that given
linear unit (ReLU) or the leaky ReLU. The ReLU is given by their saturating nature their derivatives are close to zero for large or small
\begin{equation} input values which can slow or hinder the progress of gradient based methods.
The nonsaturating activation functions commonly used are the recified
linear using (ReLU) or the leaky RelU. The ReLU is given by
\[
r(x) = \max\left\{0, x\right\}. r(x) = \max\left\{0, x\right\}.
\label{eq:relu} \]
\end{equation}
This has the benefit of having a constant derivative for values larger This has the benefit of having a constant derivative for values larger
than zero. However, the derivative being zero for negative values has than zero. However the derivative being zero has the same downside for
the same downside for fitting the model with gradient based methods. The leaky ReLU is
fitting the model with gradient-based methods. The leaky ReLU is
an attempt to counteract this problem by assigning a small constant an attempt to counteract this problem by assigning a small constant
derivative to all values smaller than zero and for a scalar $\alpha$ is given by derivative to all values smaller than zero and for scalar $\alpha$ is given by
\[ \[
l(x) = \max\left\{0, x\right\} + \alpha \min \left\{0, x\right\}. l(x) = \max\left\{0, x\right\} + \alpha \min \left\{0, x\right\}.
\] \]
In Figure~\ref{fig:activation} visualizations of these functions are given. In order to illustrate these functions plots of them are given in Figure~\ref{fig:activation}.
%In order to illustrate these functions plots of them are given in Figure~\ref{fig:activation}.
\begin{figure}
\centering
\begin{subfigure}{.45\linewidth}
\centering
\begin{tikzpicture}
\begin{axis}[enlargelimits=false, ymin=0, ymax = 1, width=\textwidth]
\addplot [domain=-5:5, samples=101,unbounded coords=jump]{1/(1+exp(-x)};
\end{axis}
\end{tikzpicture}
\caption{\titlecap{standard logistic function}}
\end{subfigure}
\begin{subfigure}{.45\linewidth}
\centering
\begin{tikzpicture}
\begin{axis}[enlargelimits=false, width=\textwidth]
\addplot[domain=-5:5, samples=100]{tanh(x)};
\end{axis}
\end{tikzpicture}
\caption{\titlecap{tangens hyperbolicus}}
\end{subfigure}
\begin{subfigure}{.45\linewidth}
\centering
\begin{tikzpicture}
\begin{axis}[enlargelimits=false, width=\textwidth,
ytick={0,2,4},yticklabels={\hphantom{4.}0,2,4}, ymin=-1]
\addplot[domain=-5:5, samples=100]{max(0,x)};
\end{axis}
\end{tikzpicture}
\caption{ReLU}
\end{subfigure}
\begin{subfigure}{.45\linewidth}
\centering
\begin{tikzpicture}
\begin{axis}[enlargelimits=false, width=\textwidth, ymin=-1,
ytick={0,2,4},yticklabels={$\hphantom{-5.}0$,2,4}]
\addplot[domain=-5:5, samples=100]{max(0,x)+ 0.1*min(0,x)};
\end{axis}
\end{tikzpicture}
\caption{Leaky ReLU, $\alpha = 0.1$}
\end{subfigure}
\caption{Plots of the activation functions}
\label{fig:activation}
\end{figure}
\begin{figure} \begin{figure}
@ -241,62 +274,17 @@ In Figure~\ref{fig:activation} visualizations of these functions are given.
% \draw [->] (hidden-\i) -- (output-\j); % \draw [->] (hidden-\i) -- (output-\j);
\end{tikzpicture} \end{tikzpicture}
\caption[Structure of a Single Neuron]{Structure of a single neuron.} \caption{Structure of a single neuron}
\label{fig:neuron} \label{fig:neuron}
\end{figure} \end{figure}
\begin{figure}
\centering
\begin{subfigure}{.45\linewidth}
\centering
\begin{tikzpicture}
\begin{axis}[enlargelimits=false, ymin=0, ymax = 1, width=\textwidth]
\addplot [domain=-5:5, samples=101,unbounded coords=jump]{1/(1+exp(-x)};
\end{axis}
\end{tikzpicture}
\caption{Standard Logistic Function}
\end{subfigure}
\begin{subfigure}{.45\linewidth}
\centering
\begin{tikzpicture}
\begin{axis}[enlargelimits=false, width=\textwidth]
\addplot[domain=-5:5, samples=100]{tanh(x)};
\end{axis}
\end{tikzpicture}
\caption{Tangens Hyperbolicus}
\end{subfigure}
\begin{subfigure}{.45\linewidth}
\centering
\begin{tikzpicture}
\begin{axis}[enlargelimits=false, width=\textwidth,
ytick={0,2,4},yticklabels={\hphantom{4.}0,2,4}, ymin=-1]
\addplot[domain=-5:5, samples=100]{max(0,x)};
\end{axis}
\end{tikzpicture}
\caption{ReLU}
\end{subfigure}
\begin{subfigure}{.45\linewidth}
\centering
\begin{tikzpicture}
\begin{axis}[enlargelimits=false, width=\textwidth, ymin=-1,
ytick={0,2,4},yticklabels={$\hphantom{-5.}0$,2,4}]
\addplot[domain=-5:5, samples=100]{max(0,x)+ 0.1*min(0,x)};
\end{axis}
\end{tikzpicture}
\caption{Leaky ReLU, $\alpha = 0.1$}
\end{subfigure}
\caption[Plots of the Activation Functions]{Plots of the activation functions.}
\label{fig:activation}
\end{figure}
\clearpage \clearpage
\subsection{Training Neural Networks} \subsection{Training Neural Networks}
As neural networks are parametric models we need to fit the As neural networks are a PARAMETRIC model we need to fit it to input
parameters to the input data in order to get meaningfull OUTPUT from the network in order to
data to get meaningful predictions from the network. In order do this we first need to discuss how we interpret the output of the
to accomplish this we need to discuss how we interpret the output of the neural network.
neural network and assess the quality of predictions.
% After a neural network model is designed, like most statistical models % After a neural network model is designed, like most statistical models
% it has to be fit to the data. In the machine learning context this is % it has to be fit to the data. In the machine learning context this is
@ -314,20 +302,20 @@ neural network and assess the quality of predictions.
% data-point in fitting the model, where usually some distance between % data-point in fitting the model, where usually some distance between
% the model output and the labels is minimized. % the model output and the labels is minimized.
\subsubsection{Nonlinearity in the Last Layer} \subsubsection{\titlecap{nonliniarity in last layer}}
Given the nature of the neural net, the outputs of the last layer are Given the nature of the neural net the output of the last layer are
real numbers. For regression tasks, this is desirable, for real numbers. For regression tasks this is desirable, for
classification problems however some transformations might be classification problems however some transformations might be
necessary. necessary.
As the goal in the latter is to predict a certain class or classes for As the goal in the latter is to predict a certain class or classes for
an object, the output needs to be of a form that allows this an object the output needs to be of a form that allows this
interpretation. interpretation.
Commonly the nodes in the output layer each correspond to a class and Commonly the nodes in the output layer each correspond to a class and
the class chosen as prediction is the one with the highest value at the class chosen as prediction is the one with the highest value at
the corresponding output node. the corresponding output node.
This can be modeled as a transformation of the output This corresponds to a transformation of the output
vector $o \in \mathbb{R}^n$ into a one-hot vector vector $o$ into a one-hot vector
\[ \[
\text{pred}_i = \text{pred}_i =
\begin{cases} \begin{cases}
@ -335,20 +323,19 @@ vector $o \in \mathbb{R}^n$ into a one-hot vector
0,& \text{else}. 0,& \text{else}.
\end{cases} \end{cases}
\] \]
This however makes training the model with gradient-based methods impossible, as the derivative of This however makes training the model with gradient based methods impossible, as the derivative of
the transformation is either zero or undefined. the transformation is either zero or undefined.
An continuous transformation that is close to argmax is given by A continuous transformation that is close to the argmax one is given by
softmax softmax
\begin{equation} \[
\text{softmax}(o)_i = \frac{e^{o_i}}{\sum_j e^{o_j}}. \text{softmax}(o)_i = \frac{e^{o_i}}{\sum_j e^{o_j}}.
\label{eq:softmax} \]
\end{equation}
The softmax function transforms the realm of the output to the interval $[0,1]$ The softmax function transforms the realm of the output to the interval $[0,1]$
and the individual values sum to one, thus the output can be interpreted as and the individual values sum to one, thus the output can be interpreted as
a probability for each class conditioned on the input. a probability for each class given the input.
Additionally, to being differentiable this allows to evaluate the Additionally to being differentiable this allows for evaluataing the
certainty of a prediction, rather than just whether it is accurate. cetainiy of a prediction, rather than just whether it is accurate.
A similar effect is obtained when for a binary or two-class problem the A similar effect is obtained when for a binary or two class problem the
sigmoid function sigmoid function
\[ \[
f(x) = \frac{1}{1 + e^{-x}} f(x) = \frac{1}{1 + e^{-x}}
@ -356,6 +343,7 @@ sigmoid function
is used and the output $f(x)$ is interpreted as the probability for is used and the output $f(x)$ is interpreted as the probability for
the first class and $1-f(x)$ for the second class. the first class and $1-f(x)$ for the second class.
\todo{vielleicht additiv invarianz}
% Another property that makes softmax attractive is the invariance to addition % Another property that makes softmax attractive is the invariance to addition
% \[ % \[
% \text{sofmax}(o) = \text{softmax}(o + c % \text{sofmax}(o) = \text{softmax}(o + c
@ -391,62 +379,57 @@ the first class and $1-f(x)$ for the second class.
% way to circumvent this problem is to normalize the output vector is % way to circumvent this problem is to normalize the output vector is
% such a way that the entries add up to one, this allows for the % such a way that the entries add up to one, this allows for the
% interpretation of probabilities assigned to each class. % interpretation of probabilities assigned to each class.
\clearpage
\subsubsection{Error Measurement} \subsubsection{Error Measurement}
In order to train the network we need to be able to assess the quality In order to make assessment about the quality of a network $\mathcal{NN}$ and train
of predictions using some error measure. it we need to discuss how we measure error. The choice of the error
The choice of the error function is highly dependent on the type of the problem. For
function is highly dependent on the type of problem. For regression problems a commonly used error measure is the mean squared
regression problems, a commonly used error measure is the mean squared
error (MSE) error (MSE)
which for a function $f$ and data $(x_i,y_i), i \in \left\{1,\dots,n\right\}$ is given by which for a function $f$ and data $(x_i,y_i), i=1,\dots,n$ is given by
\[ \[
MSE(f) = \frac{1}{n} \sum_i^n \left(f(x_i) - y_i\right)^2. MSE(f) = \frac{1}{n} \sum_i^n \left(f(x_i) - y_i\right)^2.
\] \]
However, depending on the problem error measures with different However depending on the problem error measures with differnt
properties might be needed. For example in some contexts it is properties might be needed, for example in some contexts it is
required to consider a proportional rather than absolute error. required to consider a proportional rather than absolute error as is
common in time series models. \todo{komisch}
As discussed above the output of a neural network for a classification As discussed above the output of a neural network for a classification
problem can be interpreted as a probability distribution over the classes problem can be interpreted as a probability distribution over the classes
conditioned on the input. In this case, it is desirable to conditioned on the input. In this case it is desirable to
use error functions designed to compare probability distributions. A use error functions designed to compare probability distributions. A
widespread error function for this use case is the categorical cross entropy (\textcite{PRML}), widespread error function for this use case is the cross entropy (\textcite{PRML}),
which for two discrete distributions $p, q$ with the same realm $C$ is given by which for two discrete distributions $p, q$ with the same realm $C$ is given by
\[ \[
H(p, q) = \sum_{c \in C} p(c) \ln\left(\frac{1}{q(c)}\right), H(p, q) = \sum_{c \in C} p(c) \ln\left(\frac{1}{q(c)}\right),
\] \]
comparing $q$ to a target density $p$. which compares a $q$ to a true underlying distribution $p$.
For a data set $(x_i,y_i), i \in \left\{1,\dots,n\right\}$ where each $y_{i,c}$ For a data set $(x_i,y_i), i = 1,\dots,n$ where each $y_{i,c}$
corresponds to the probability of class $c$ given $x_i$ and a predictor corresponds to the probability of class $c$ given $x_i$ and predictor
$f$ we get the loss function $f$ we get the loss function
\begin{equation} \[
CE(f) = \sum_{i=1}^n H(y_i, f(x_i)). Bla = \sum_{i=1}^n H(y_i, f(x_i)).
\label{eq:cross_entropy} \]
\end{equation}
% \todo{Den satz einbauen} -Maximum Likelihood
% -Maximum Likelihood -Ableitung mit softmax pseudo linear -> fast improvemtns possible
% -Ableitung mit softmax pseudo linear -> fast improvemtns possible
\subsubsection{Gradient Descent Algorithm} \subsubsection{Gradient Descent Algorithm}
Trying to find the optimal parameter for fitting the model to the data Trying to find the optimal parameter for fitting the model to the data
can be a hard problem. Given the complex nature of a neural network can be a hard problem. Given the complex nature of a neural network
with many layers and neurons, it is hard to predict the impact of with many layers and neurons it is hard to predict the impact of
single parameters on the accuracy of the output. single parameters on the accuracy of the output.
Thus using numeric optimization algorithms is the only Thus applying numeric optimization algorithms is the only
feasible way to fit the model. feasible way to fit the model. A attractive algorithm for training
neural networks is gradient descent where each parameter $\theta_i$ is
An attractive algorithm for training iterative changed according to the gradient regarding the error
neural networks is gradient descent. Here all parameters are measure and a step size $\gamma$. For this all parameters are
initialized with certain values (often random or close to zero) and initialized (often random or close to zero) and then iteratively
then iteratively updated. The updates are made in the direction of the updated until a certain stopping criterion is hit, mostly either being a fixed
gradient regarding the error with a step size $\gamma$ until a number of iterations or a desired upper limit for the error measure.
specified stopping criterion is hit.
% This mostly either being a fixed
% number of iterations or a desired upper limit for the error measure.
% For a function $f_\theta$ with parameters $\theta \in \mathbb{R}^n$ % For a function $f_\theta$ with parameters $\theta \in \mathbb{R}^n$
% and a error function $L(f_\theta)$ the gradient descent algorithm is % and a error function $L(f_\theta)$ the gradient descent algorithm is
% given in \ref{alg:gd}. % given in \ref{alg:gd}.
@ -469,21 +452,16 @@ specified stopping criterion is hit.
The algorithm for gradient descent is given in The algorithm for gradient descent is given in
Algorithm~\ref{alg:gd}. In the context of fitting a neural network Algorithm~\ref{alg:gd}. In the context of fitting a neural network
$f_\theta$ corresponds to an error measurement of a neural network $f_\theta$ corresponds to the error measurement of the network
$\mathcal{NN}_{\theta}$ where $\theta$ is a vector $L\left(\mathcal{NN}_{\theta}\right)$ where $\theta$ is a vector
containing all the weights and biases of the network. containing all the weights and biases of the network.
As can be seen, this requires computing the derivative of the network As ca be seen this requires computing the derivative of the network
with regard to each variable. With the number of variables getting with regard to each variable. With the number of variables getting
large in networks with multiple layers of high neuron count naively large in networks with multiple layers of high neuron count naively
computing the derivatives can get quite memory and computational computing these can get quite memory and computational expensive. But
expensive. by using the chain rule and exploiting the layered structure we can
By using the chain rule and exploiting the layered structure we can compute the gradient much more efficiently by using backpropagation
compute the parameter update much more efficiently. This practice is introduced by \textcite{backprop}.
called backpropagation and was introduced for use in neural networks by
\textcite{backprop}. The algorithm
for one data point is given in Algorithm~\ref{alg:backprop}, but for all error
functions that are sums of errors for single data points (MSE, cross
entropy) backpropagation works analogously for larger training data.
% \subsubsection{Backpropagation} % \subsubsection{Backpropagation}
@ -497,34 +475,10 @@ entropy) backpropagation works analogously for larger training data.
% for each layer from output layer towards the first layer while only % for each layer from output layer towards the first layer while only
% needing to .... % needing to ....
\begin{algorithm}[H] \[
\SetAlgoLined \frac{\partial L(...)}{}
\KwInput{Inputs $o_0$, neural network \]
with $L$ hidden layers, weights $w$, and biases $b$ for $n_l$ \todo{Backprop richtig aufschreiben}
nodes as well as an activation function $\sigma_l$ in layer $l$
and loss function $\tilde{L}$.}
Forward Propagation:
\For{$l \in \left\{1, \dots, L+1\right\}$}{
Compute values for layer $l$:
$z_{l,k} \leftarrow b_{l,k} + w_{l,k}^{\mathrm{T}} o_{l-1}, k \in \left\{1,\dots,n_l\right\}$\;
$o_{l,k} \leftarrow \sigma_l(z_{l,k}), k \in \left\{1,\dots,n_l\right\}$ \;
}
Calculate derivative for output layer: $\delta_{L+1, k} \leftarrow
\frac{\partial\tilde{L}(o_{L+1})}{\partial o_{L+1,k}} \sigma_{L+1}'(z_{L+1,k})$\;
Back propagate the error:
\For{$l \in \left\{L,\dots,1\right\}$}{
$\delta_{l,k} \leftarrow w_{l+1,k}^{\mathrm{T}} \delta_{l+1}
\sigma_{l}'(z_{l,k}), k=1,\dots,n_k$
}
Calculate gradients:
$\frac{\partial\tilde{L}}{\partial w_{l,k,j}} =
\delta_{l,k}o_{l-1,j}$,
$\frac{\partial\tilde{L}}{\partial b_{l,k}} =
\delta_{l,k}$\;
\caption{Backpropagation for one data point}
\label{alg:backprop}
\end{algorithm}
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\babel@toc {english}{}
\defcounter {refsection}{0}\relax
\contentsline {table}{\numberline {4.1}{\ignorespaces Values of Test Accuracies for Models Trained on Subsets of MNIST Handwritten Digits}}{41}{table.4.1}%
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\BOOKMARK [1][-]{section.1}{Introduction}{}% 1
\BOOKMARK [1][-]{section.2}{Introduction to Neural Networks}{}% 2
\BOOKMARK [2][-]{subsection.2.1}{Nonlinearity of Neural Networks}{section.2}% 3
\BOOKMARK [2][-]{subsection.2.2}{Training Neural Networks}{section.2}% 4
\BOOKMARK [3][-]{subsubsection.2.2.1}{Nonlinearity in the Last Layer}{subsection.2.2}% 5
\BOOKMARK [3][-]{subsubsection.2.2.2}{Error Measurement}{subsection.2.2}% 6
\BOOKMARK [3][-]{subsubsection.2.2.3}{Gradient Descent Algorithm}{subsection.2.2}% 7
\BOOKMARK [1][-]{section.3}{Shallow Neural Networks}{}% 8
\BOOKMARK [2][-]{subsection.3.1}{Convergence Behavior of One-Dimensional Randomized Shallow Neural Networks}{section.3}% 9
\BOOKMARK [2][-]{subsection.3.2}{Simulations}{section.3}% 10
\BOOKMARK [1][-]{section.4}{Application of Neural Networks to Higher Complexity Problems}{}% 11
\BOOKMARK [2][-]{subsection.4.1}{Convolution}{section.4}% 12
\BOOKMARK [2][-]{subsection.4.2}{Convolutional Neural Networks}{section.4}% 13
\BOOKMARK [2][-]{subsection.4.3}{Stochastic Training Algorithms}{section.4}% 14
\BOOKMARK [2][-]{subsection.4.4}{Modified Stochastic Gradient Descent}{section.4}% 15
\BOOKMARK [2][-]{subsection.4.5}{Combating Overfitting}{section.4}% 16
\BOOKMARK [3][-]{subsubsection.4.5.1}{Dropout}{subsection.4.5}% 17
\BOOKMARK [3][-]{subsubsection.4.5.2}{Manipulation of Input Data}{subsection.4.5}% 18
\BOOKMARK [3][-]{subsubsection.4.5.3}{Comparisons}{subsection.4.5}% 19
\BOOKMARK [3][-]{subsubsection.4.5.4}{Effectiveness for Small Training Sets}{subsection.4.5}% 20
\BOOKMARK [1][-]{section.5}{Summary and Outlook}{}% 21
\BOOKMARK [1][-]{section*.27}{Appendices}{}% 22
\BOOKMARK [1][-]{Appendix.1.A}{Notes on Proofs of Lemmata in Section 3.1}{}% 23
\BOOKMARK [1][-]{Appendix.1.B}{Implementations}{}% 24
\BOOKMARK [1][-]{Appendix.1.C}{Additional Comparisons}{}% 25

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@ -1,4 +1,4 @@
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@ -6,7 +6,6 @@
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@ -35,18 +34,10 @@
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\captionsetup[sub]{justification=centering} \captionsetup[sub]{justification=centering}
@ -61,125 +52,9 @@
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@ -198,13 +73,11 @@
\newtheorem{Algorithm}[Theorem]{Algorithm} \newtheorem{Algorithm}[Theorem]{Algorithm}
\newtheorem{Example}[Theorem]{Example} \newtheorem{Example}[Theorem]{Example}
\newtheorem{Assumption}[Theorem]{Assumption} \newtheorem{Assumption}[Theorem]{Assumption}
\newtheorem{Proof}[Theorem]{Proof}
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\begin{document} \begin{document}
@ -230,36 +103,19 @@
%\textbf{Seminar Machine--Learning: Unsupervised %Learning} \newline %\textbf{Seminar Machine--Learning: Unsupervised %Learning} \newline
%Institut für Mathematik der Universität %Augsburg\\ %Institut für Mathematik der Universität %Augsburg\\
%Lehrstuhl für Rechnerorientierte Statistik und %Datenanalyse\\ %Lehrstuhl für Rechnerorientierte Statistik und %Datenanalyse\\
\smallskip\hrule\bigskip
\begin{center} \begin{center}
\huge \textbf{Master Thesis}\\ {\huge{Electricity Price Forecasting based on Regression Tree Models}}
\vspace{1cm}
\Large \textbf{University Augsburg\\Department of Mathematics\\Chair of
Computational Statistics and Data Analysis}
\vspace{1cm}
\end{center} \end{center}
\hrulefill
\begin{figure}[h]
\centering
\includegraphics[scale=1.3]{Figures/Uni_Aug_Siegel_32Grad_schwarz.png}
\end{figure}
\begin{center}
\vspace{1cm}
\huge \textbf{Neural Networks and their Application on Higher Complexity Problems}\\
\vspace{1cm}
\huge \textbf{Tim Tobias Arndt}\\
\vspace{1cm}
\Large \textbf{October 2020}
\end{center}
\pagenumbering{gobble} \pagenumbering{gobble}
\clearpage \newpage
%\setcounter{tocdepth}{4} %\setcounter{tocdepth}{4}
\tableofcontents \tableofcontents
\clearpage \clearpage
\listoffigures \listoffigures
\listoftables \listoftodos
\newpage \newpage
\pagenumbering{arabic} \pagenumbering{arabic}
% Introduction % Introduction
@ -281,7 +137,7 @@
\input{further_applications_of_nn} \input{further_applications_of_nn}
\newpage \newpage
\DeclareNameAlias{sortname}{last-first}
\printbibliography \printbibliography
% Appendix A % Appendix A

514
TeX/theo_3_8.tex
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@ -5,18 +5,17 @@
%%% TeX-master: "main" %%% TeX-master: "main"
%%% End: %%% End:
\section{Shallow Neural Networks} \section{Shallow Neural Networks}
\label{sec:shallownn}
% In order to get a some understanding of the behavior of neural % In order to get a some understanding of the behavior of neural
% networks we study a simplified class of networks called shallow neural % networks we study a simplified class of networks called shallow neural
% networks in this chapter. % networks in this chapter.
% We consider shallow neural networks consist of a single % We consider shallow neural networks consist of a single
% hidden layer and % hidden layer and
To get some understanding of the behavior of neural networks In order to get some understanding of the behavior of neural networks
we examine a simple class of networks in this chapter. We consider we examine a simple class of networks in this chapter. We consider
networks that contain only one hidden layer and have a single output networks that contain only one hidden layer and have a single output
node and call these networks shallow neural networks. node. We call these networks shallow neural networks.
\begin{Definition}[Shallow neural network, Heiss, Teichmann, and \begin{Definition}[Shallow neural network]
Wutte (2019, Definition 1.4)]
For a input dimension $d$ and a Lipschitz continuous activation function $\sigma: For a input dimension $d$ and a Lipschitz continuous activation function $\sigma:
\mathbb{R} \to \mathbb{R}$ we define a shallow neural network with \mathbb{R} \to \mathbb{R}$ we define a shallow neural network with
$n$ hidden nodes as $n$ hidden nodes as
@ -85,8 +84,8 @@ with
% \label{fig:shallowNN} % \label{fig:shallowNN}
% \end{figure} % \end{figure}
As neural networks with a large number of nodes have a large amount of As neural networks with a large amount of nodes have a large amount of
tunable parameters it can often fit data quite well. If parameters that can be tuned it can often fit the data quite well. If
a ReLU activation function a ReLU activation function
\[ \[
\sigma(x) \coloneqq \max{(0, x)} \sigma(x) \coloneqq \max{(0, x)}
@ -106,9 +105,9 @@ on MSE will perfectly fit the data.
minimizing squared error loss. minimizing squared error loss.
\proof \proof
W.l.o.g. all values $x_{ij}^{\text{train}} \in [0,1],~\forall i \in W.l.o.g. all values $x_{ij}^{\text{train}} \in [0,1],~\forall i \in
\left\{1,\dots, t\right\}, j \in \left\{1,\dots,d\right\}$. Now we \left\{1,\dots\right\}, j \in \left\{1,\dots,d\right\}$. Now we
chose $v^*$ such that the vector-product with $x_i^{\text{train}}$ chose $v^*$ in order to calculate a unique value for all
results is distinct values for all $i \in \left\{1,\dots,t\right\}$: $x_i^{\text{train}}$:
\[ \[
v^*_{k,j} = v^*_{j} = 10^{j-1}, ~ \forall k \in \left\{1,\dots,n\right\}. v^*_{k,j} = v^*_{j} = 10^{j-1}, ~ \forall k \in \left\{1,\dots,n\right\}.
\] \]
@ -142,32 +141,30 @@ on MSE will perfectly fit the data.
and $\vartheta^* = (w^*, b^*, v^*, c = 0)$ we get and $\vartheta^* = (w^*, b^*, v^*, c = 0)$ we get
\[ \[
\mathcal{NN}_{\vartheta^*} (x_i^{\text{train}}) = \sum_{k = \mathcal{NN}_{\vartheta^*} (x_i^{\text{train}}) = \sum_{k =
1}^{i-1} w_k\left(b_k^* + \left(v^*\right)^{\mathrm{T}} 1}^{i-1} w_k\left(\left(v^*\right)^{\mathrm{T}}
x_i^{\text{train}}\right) + w_i\left(b_i^* +\left(v^*\right)^{\mathrm{T}} x_i^{\text{train}}\right) + w_i\left(\left(v^*\right)^{\mathrm{T}}
x_i^{\text{train}}\right) = y_i^{\text{train}}. x_i^{\text{train}}\right) = y_i^{\text{train}}.
\] \]
As the squared error of $\mathcal{NN}_{\vartheta^*}$ is zero all As the squared error of $\mathcal{NN}_{\vartheta^*}$ is zero all
squared error loss minimizing shallow networks with at least $t$ hidden squared error loss minimizing shallow networks with at least $t$ hidden
nodes will perfectly fit the data. \qed nodes will perfectly fit the data.
\qed
\label{theo:overfit} \label{theo:overfit}
\end{Theorem} \end{Theorem}
However, this behavior is often not desired as overfit models tend to However this behavior is often not desired as over fit models generally
have bad generalization properties, especially if noise is present in have bad generalization properties especially if noise is present in
the data. This effect is illustrated in the data. This effect is illustrated in
Figure~\ref{fig:overfit}. Figure~\ref{fig:overfit}. Here a shallow neural network that perfectly fits the
training data regarding MSE is \todo{Formulierung}
Here a shallow neural network is constructed according to the proof of Theorem~\ref{theo:overfit} and
constructed according to the proof of Theorem~\ref{theo:overfit} to compared to a regression spline
perfectly fit some data and
compared to a cubic smoothing spline
(Definition~\ref{def:wrs}). While the neural network (Definition~\ref{def:wrs}). While the neural network
fits the data better than the spline, the spline represents the fits the data better than the spline, the spline represents the
underlying mechanism that was used to generate the data more accurately. The better underlying mechanism that was used to generate the data more accurately. The better
generalization of the spline compared to the network is further generalization of the spline compared to the network is further
demonstrated by the better performance on newly generated demonstrated by the better validation error computed on newly generated
test data. test data.
In order to improve the accuracy of the model we want to reduce In order to improve the accuracy of the model we want to reduce
overfitting. A possible way to achieve this is by explicitly overfitting. A possible way to achieve this is by explicitly
regularizing the network through the cost function as done with regularizing the network through the cost function as done with
@ -175,12 +172,13 @@ ridge penalized networks
(Definition~\ref{def:rpnn}) where large weights $w$ are punished. In (Definition~\ref{def:rpnn}) where large weights $w$ are punished. In
Theorem~\ref{theo:main1} we will Theorem~\ref{theo:main1} we will
prove that this will result in the shallow neural network converging to prove that this will result in the shallow neural network converging to
a form of splines as the number of nodes in the hidden layer is regressions splines as the amount of nodes in the hidden layer is
increased. increased.
\vfill
\begin{figure}[h]
\begin{figure}
\pgfplotsset{ \pgfplotsset{
compat=1.11, compat=1.11,
legend image code/.code={ legend image code/.code={
@ -197,26 +195,25 @@ increased.
height = 0.6\textwidth] height = 0.6\textwidth]
\addplot table \addplot table
[x=x, y=y, col sep=comma, only marks,mark options={scale = [x=x, y=y, col sep=comma, only marks,mark options={scale =
0.7}] {Figures/Data/overfit.csv}; 0.7}] {Plots/Data/overfit.csv};
\addplot [red, line width=0.8pt] table [x=x_n, y=s_n, col \addplot [red, line width=0.8pt] table [x=x_n, y=s_n, col
sep=comma] {Figures/Data/overfit.csv}; sep=comma, forget plot] {Plots/Data/overfit.csv};
\addplot [black, line width=0.8pt] table [x=x_n, y=y_n, col \addplot [black, line width=0.8pt] table [x=x_n, y=y_n, col
sep=comma] {Figures/Data/overfit.csv}; sep=comma] {Plots/Data/overfit.csv};
\addplot [black, line width=0.8pt, dashed] table [x=x, y=y, col \addplot [black, line width=0.8pt, dashed] table [x=x, y=y, col
sep=comma] {Figures/Data/overfit_spline.csv}; sep=comma] {Plots/Data/overfit_spline.csv};
\addlegendentry{\footnotesize{Data}}; \addlegendentry{\footnotesize{data}};
\addlegendentry{\footnotesize{Truth}};
\addlegendentry{\footnotesize{$\mathcal{NN}_{\vartheta^*}$}}; \addlegendentry{\footnotesize{$\mathcal{NN}_{\vartheta^*}$}};
\addlegendentry{\footnotesize{Spline}}; \addlegendentry{\footnotesize{spline}};
\end{axis} \end{axis}
\end{tikzpicture} \end{tikzpicture}
\caption[Overfitting of Shallow Neural Networks]{For data of the form $y=\sin(\frac{x+\pi}{2 \pi}) + \caption[Overfitting of shallow neural networks]{For data of the form $y=\sin(\frac{x+\pi}{2 \pi}) +
\varepsilon,~ \varepsilon \sim \mathcal{N}(0,0.4)$ \varepsilon,~ \varepsilon \sim \mathcal{N}(0,0.4)$
(\textcolor{blue}{blue}) the neural network constructed (\textcolor{blue}{blue dots}) the neural network constructed
according to the proof of Theorem~\ref{theo:overfit} (black) and the according to the proof of Theorem~\ref{theo:overfit} (black) and the
underlying signal (\textcolor{red}{red}). While the network has no underlying signal (\textcolor{red}{red}). While the network has no
bias a cubic smoothing spline (black, dashed) fits the data much bias a regression spline (black dashed) fits the data much
better. For a test set of size 20 with uniformly distributed $x$ better. For a test set of size 20 with uniformly distributed $x$
values and responses of the same fashion as the training data the MSE of the neural network is values and responses of the same fashion as the training data the MSE of the neural network is
0.30, while the MSE of the spline is only 0.14 thus generalizing 0.30, while the MSE of the spline is only 0.14 thus generalizing
@ -225,43 +222,31 @@ increased.
\label{fig:overfit} \label{fig:overfit}
\end{figure} \end{figure}
\vfill
\clearpage \clearpage
\subsection{Convergence Behavior of One-Dimensional Randomized Shallow \subsection{Convergence Behaviour of 1-dim. Randomized Shallow Neural
Neural Networks} Networks}
\label{sec:conv}
This section is based on \textcite{heiss2019}.
In this section, we examine the convergence behavior of certain shallow
neural networks.
We consider shallow neural networks with a one dimensional input where the parameters in the
hidden layer are randomized resulting in only the weights is the
output layer being trainable.
Additionally, we assume all neurons use a ReLU as an activation function
and call such networks randomized shallow neural networks.
% We will analyze the This section is based on \textcite{heiss2019}. We will analyze the
% connection between randomized shallow connection between randomized shallow
% Neural Networks with one dimensional input with a ReLU as activation Neural Networks with one dimensional input with a ReLU as activation
% function for all neurons and cubic smoothing splines. function for all neurons and regression splines.
% % \[ % \[
% % \sigma(x) = \max\left\{0,x\right\}. % \sigma(x) = \max\left\{0,x\right\}.
% % \] % \]
% We will see that the punishment of the size of the weights in training We will see that the punishment of the size of the weights in training
% the randomized shallow the randomized shallow
% Neural Network will result in a learned function that minimizes the second Neural Network will result in a learned function that minimizes the second
% derivative as the amount of hidden nodes is grown to infinity. In order derivative as the amount of hidden nodes is grown to infinity. In order
% to properly formulate this relation we will first need to introduce to properly formulate this relation we will first need to introduce
% some definitions, all neural networks introduced in the following will some definitions, all neural networks introduced in the following will
% use a ReLU as activation at all neurons. use a ReLU as activation at all neurons.
% A randomized shallow network is characterized by only the weight A randomized shallow network is characterized by only the weight
% parameter of the output layer being trainable, whereas the other parameter of the output layer being trainable, whereas the other
% parameters are random numbers. parameters are random numbers.
\begin{Definition}[Randomized shallow neural network, Heiss, Teichmann, and \begin{Definition}[Randomized shallow neural network]
Wutte (2019, Definition 2.1)]
For an input dimension $d$, let $n \in \mathbb{N}$ be the number of For an input dimension $d$, let $n \in \mathbb{N}$ be the number of
hidden nodes and $v(\omega) \in \mathbb{R}^{i \times n}, b(\omega) hidden nodes and $v(\omega) \in \mathbb{R}^{i \times n}, b(\omega)
\in \mathbb{R}^n$ randomly drawn weights. Then for a weight vector \in \mathbb{R}^n$ randomly drawn weights. Then for a weight vector
@ -272,27 +257,15 @@ and call such networks randomized shallow neural networks.
\] \]
\label{def:rsnn} \label{def:rsnn}
\end{Definition} \end{Definition}
% We call a one dimensional randomized shallow neural network were the We call a one dimensional randomized shallow neural network were the
% are penalized in the loss $L^2$ norm of the trainable weights $w$ are penalized in the loss
% function ridge penalized neural networks. function ridge penalized neural networks.
We will prove that if we penalize the amount of the trainable weights
when fitting a randomized shallow neural network it will
converge to a function that minimizes the distance to the training
data with respect to its second derivative as the amount of nodes is increased.
We call such a network that is fitted according to MSE and a penalty term for
the $L^2$ norm of the trainable weights $w$ a ridge penalized neural network.
% $\lam$
% We call a randomized shallow neural network trained on MSE and
% punished for the amount of the weights $w$ according to a
% ... $\lambda$ ridge penalized neural networks.
% We call a randomized shallow neural network where the size of the trainable % We call a randomized shallow neural network where the size of the trainable
% weights is punished in the error function a ridge penalized % weights is punished in the error function a ridge penalized
% neural network. For a tuning parameter $\tilde{\lambda}$ .. the extent % neural network. For a tuning parameter $\tilde{\lambda}$ .. the extent
% of penalization we get: % of penalization we get:
\begin{Definition}[Ridge penalized Neural Network, Heiss, Teichmann, and \begin{Definition}[Ridge penalized Neural Network]
Wutte (2019, Definition 3.2)]
\label{def:rpnn} \label{def:rpnn}
Let $\mathcal{RN}_{w, \omega}$ be a randomized shallow neural Let $\mathcal{RN}_{w, \omega}$ be a randomized shallow neural
network, as introduced in Definition~\ref{def:rsnn} and tuning network, as introduced in Definition~\ref{def:rsnn} and tuning
@ -303,7 +276,7 @@ the $L^2$ norm of the trainable weights $w$ a ridge penalized neural network.
\mathcal{RN}^{*, \tilde{\lambda}}_{\omega}(x) \coloneqq \mathcal{RN}^{*, \tilde{\lambda}}_{\omega}(x) \coloneqq
\mathcal{RN}_{w^{*, \tilde{\lambda}}(\omega), \omega} \mathcal{RN}_{w^{*, \tilde{\lambda}}(\omega), \omega}
\] \]
with \ with
\[ \[
w^{*,\tilde{\lambda}}(\omega) :\in \argmin_{w \in w^{*,\tilde{\lambda}}(\omega) :\in \argmin_{w \in
\mathbb{R}^n} \underbrace{ \left\{\overbrace{\sum_{i = 1}^N \left(\mathcal{RN}_{w, \mathbb{R}^n} \underbrace{ \left\{\overbrace{\sum_{i = 1}^N \left(\mathcal{RN}_{w,
@ -319,7 +292,7 @@ having minimal weights, resulting in the \textit{minimum norm
network} $\mathcal{RN}_{w^{\text{min}}, \omega}$. network} $\mathcal{RN}_{w^{\text{min}}, \omega}$.
\[ \[
\mathcal{RN}_{w^{\text{min}}, \omega} \text{ randomized shallow \mathcal{RN}_{w^{\text{min}}, \omega} \text{ randomized shallow
neural network with weights } w^{\text{min}}\colon Neural network with weights } w^{\text{min}}:
\] \]
\[ \[
w^{\text{min}} \in \argmin_{w \in \mathbb{R}^n} \norm{w}, \text{ w^{\text{min}} \in \argmin_{w \in \mathbb{R}^n} \norm{w}, \text{
@ -331,18 +304,18 @@ For $\tilde{\lambda} \to \infty$ the learned
function will resemble the data less and with the weights function will resemble the data less and with the weights
approaching $0$ will converge to the constant $0$ function. approaching $0$ will converge to the constant $0$ function.
To make the notation more convenient, in the following the In order to make the notation more convinient in the following the
$\omega$ used to express the realized random parameters will no longer $\omega$ used to express the realised random parameters will no longer
be explicitly mentioned. be explicitly mentioned.
We call a function that minimizes the cubic distance between training points We call a function that minimizes the cubic distance between training points
and the function with regard to the second and the function with respect\todo{richtiges wort} to the second
derivative of the function a cubic smoothing spline. derivative of the function a regression spline.
\begin{Definition}[Cubic Smoothing Spline] \begin{Definition}[Regression Spline]
Let $x_i^{\text{train}}, y_i^{\text{train}} \in \mathbb{R}, i \in Let $x_i^{\text{train}}, y_i^{\text{train}} \in \mathbb{R}, i \in
\left\{1,\dots,N\right\}$ be training data. for a given $\lambda \in \left\{1,\dots,N\right\}$ be trainig data. for a given $\lambda \in
\mathbb{R}$ the cubic smoothing spline is given by \mathbb{R}$ the regression spline is given by
\[ \[
f^{*,\lambda} :\in \argmin_{f \in f^{*,\lambda} :\in \argmin_{f \in
\mathcal{C}^2}\left\{\sum_{i=1}^N \mathcal{C}^2}\left\{\sum_{i=1}^N
@ -353,10 +326,10 @@ derivative of the function a cubic smoothing spline.
We will show that for specific hyper parameters the ridge penalized We will show that for specific hyper parameters the ridge penalized
shallow neural networks converge to a slightly modified variant of the shallow neural networks converge to a slightly modified variant of the
cubic smoothing spline. We need to incorporate the densities of the regression spline. We will need to incorporate the densities of the
random parameters in the loss function of the spline to ensure random parameters in the loss function of the spline to ensure
convergence. Thus we define convergence. Thus we define
the adapted weighted cubic smoothing spline where the loss for the second the adapted weighted regression spline where the loss for the second
derivative is weighted by a function $g$ and the support of the second derivative is weighted by a function $g$ and the support of the second
derivative of $f$ has to be a subset the support of $g$. The formal derivative of $f$ has to be a subset the support of $g$. The formal
definition is given in Definition~\ref{def:wrs}. definition is given in Definition~\ref{def:wrs}.
@ -367,20 +340,19 @@ definition is given in Definition~\ref{def:wrs}.
% spline that allows for weighting the penalty term for the second % spline that allows for weighting the penalty term for the second
% derivative with a weight function $g$. This is needed to ...the % derivative with a weight function $g$. This is needed to ...the
% distributions of the random parameters ... We call this the adapted % distributions of the random parameters ... We call this the adapted
% weighted cubic smoothing spline. % weighted regression spline.
% Now we take a look at weighted cubic smoothing splines. Later we will prove % Now we take a look at weighted regression splines. Later we will prove
% that the ridge penalized neural network as defined in % that the ridge penalized neural network as defined in
% Definition~\ref{def:rpnn} converges a weighted cubic smoothing spline, as % Definition~\ref{def:rpnn} converges a weighted regression spline, as
% the amount of hidden nodes is grown to inifity. % the amount of hidden nodes is grown to inifity.
\begin{Definition}[Adapted weighted cubic smoothing spline, Heiss, Teichmann, and \begin{Definition}[Adapted Weighted regression spline]
Wutte (2019, Definition 3.5)]
\label{def:wrs} \label{def:wrs}
Let $x_i^{\text{train}}, y_i^{\text{train}} \in \mathbb{R}, i \in Let $x_i^{\text{train}}, y_i^{\text{train}} \in \mathbb{R}, i \in
\left\{1,\dots,N\right\}$ be training data. For a given $\lambda \in \mathbb{R}_{>0}$ \left\{1,\dots,N\right\}$ be trainig data. For a given $\lambda \in \mathbb{R}_{>0}$
and a function $g: \mathbb{R} \to \mathbb{R}_{>0}$ the weighted and a function $g: \mathbb{R} \to \mathbb{R}_{>0}$ the weighted
cubic smoothing spline $f^{*, \lambda}_g$ is given by regression spline $f^{*, \lambda}_g$ is given by
\[ \[
f^{*, \lambda}_g :\in \argmin_{\substack{f \in \mathcal{C}^2(\mathbb{R}) f^{*, \lambda}_g :\in \argmin_{\substack{f \in \mathcal{C}^2(\mathbb{R})
@ -389,41 +361,43 @@ definition is given in Definition~\ref{def:wrs}.
\lambda g(0) \int_{\supp(g)}\frac{\left(f''(x)\right)^2}{g(x)} \lambda g(0) \int_{\supp(g)}\frac{\left(f''(x)\right)^2}{g(x)}
dx\right\}}_{\eqqcolon F^{\lambda, g}(f)}. dx\right\}}_{\eqqcolon F^{\lambda, g}(f)}.
\] \]
% \todo{Anforderung an Ableitung von f, doch nicht?} \todo{Anforderung an Ableitung von f, doch nicht?}
\end{Definition} \end{Definition}
Similarly to ridge weight penalized neural networks the parameter Similarly to ridge weight penalized neural networks the parameter
$\lambda$ controls a trade-off between accuracy on the training data $\lambda$ controls a trade-off between accuracy on the training data
and smoothness or low second derivative. For $g \equiv 1$ and $\lambda \to 0$ the and smoothness or low second dreivative. For $g \equiv 1$ and $\lambda \to 0$ the
resulting function $f^{*, 0+}$ will interpolate the training data while minimizing resulting function $f^{*, 0+}$ will interpolate the training data while minimizing
the second derivative. Such a function is known as cubic spline the second derivative. Such a function is known as cubic spline
interpolation. interpolation.
\vspace{-0.2cm} \todo{cite cubic spline}
\[ \[
f^{*, 0+} \text{ smooth spline interpolation: } f^{*, 0+} \text{ smooth spline interpolation: }
\] \]
\[ \[
f^{*, 0+} \coloneqq \lim_{\lambda \to 0+} f^{*, \lambda}_1 \in f^{*, 0+} \coloneqq \lim_{\lambda \to 0+} f^{*, \lambda}_1 \in
\argmin_{\substack{f \in \mathcal{C}^2(\mathbb{R}), \\ f(x_i^{\text{train}}) = \argmin_{\substack{f \in \mathcal{C}^2\mathbb{R}, \\ f(x_i^{\text{train}}) =
y_i^{\text{train}}}} = \left( \int _{\mathbb{R}} (f''(x))^2dx\right). y_i^{\text{train}}}} = \left( \int _{\mathbb{R}} (f''(x))^2dx\right).
\] \]
For $\lambda \to \infty$ on the other hand $f_g^{*\lambda}$ converges For $\lambda \to \infty$ on the other hand $f_g^{*\lambda}$ converges
to linear regression of the data. to linear regression of the data.
We use two intermediary functions in order to show the convergence of We use two intermediary functions in order to show the convergence of
the ridge penalized shallow neural network to adapted cubic smoothing splines. the ridge penalized shallow neural network to adapted regression splines.
% In order to show that ridge penalized shallow neural networks converge % In order to show that ridge penalized shallow neural networks converge
% to adapted cubic smoothing splines for a growing amount of hidden nodes we % to adapted regression splines for a growing amount of hidden nodes we
% define two intermediary functions. % define two intermediary functions.
One being a smooth approximation of a One being a smooth approximation of
neural network and the other being a randomized shallow neural network designed the neural network, and a randomized shallow neural network designed
to approximate a spline. to approximate a spline.
In order to properly construct these functions, we need to take the points In order to properly BUILD these functions we need to take the points
of the network into consideration where the trajectory of the learned of the network into consideration where the TRAJECTORY changes or
function changes their points of discontinuity
(or their points of discontinuity).
As we use the ReLU activation the function learned by the As we use the ReLU activation the function learned by the
network will possess points of discontinuity where a neuron in the hidden network will possess points of discontinuity where a neuron in the hidden
layer gets activated and their output is no longer zero. We formalize these points layer gets activated (goes from 0 -> x>0). We formalize these points
as kinks in Definition~\ref{def:kink}. as kinks in Definition~\ref{def:kink}.
\begin{Definition} \begin{Definition}
\label{def:kink} \label{def:kink}
@ -441,9 +415,9 @@ as kinks in Definition~\ref{def:kink}.
\item Let $\xi_k \coloneqq -\frac{b_k}{v_k}$ be the k-th kink of $\mathcal{RN}_w$. \item Let $\xi_k \coloneqq -\frac{b_k}{v_k}$ be the k-th kink of $\mathcal{RN}_w$.
\item Let $g_{\xi}(\xi_k)$ be the density of the kinks $\xi_k = \item Let $g_{\xi}(\xi_k)$ be the density of the kinks $\xi_k =
- \frac{b_k}{v_k}$ in accordance to the distributions of $b_k$ and - \frac{b_k}{v_k}$ in accordance to the distributions of $b_k$ and
$v_k$. With $\supp(g_\xi) = \left[C_{g_\xi}^l, C_{g_\xi}^u\right]$. $v_k$.
\item Let $h_{k,n} \coloneqq \frac{1}{n g_{\xi}(\xi_k)}$ be the \item Let $h_{k,n} \coloneqq \frac{1}{n g_{\xi}(\xi_k)}$ be the
average estimated distance from kink $\xi_k$ to the next nearest average estmated distance from kink $\xi_k$ to the next nearest
one. one.
\end{enumerate} \end{enumerate}
\end{Definition} \end{Definition}
@ -459,36 +433,40 @@ network by applying the kernel similar to convolution.
corresponding kink density $g_{\xi}$ as given by corresponding kink density $g_{\xi}$ as given by
Definition~\ref{def:kink}. Definition~\ref{def:kink}.
In order to smooth the RSNN consider following kernel for every $x$: In order to smooth the RSNN consider following kernel for every $x$:
\begin{align*}
\kappa_x(s) &\coloneqq \mathds{1}_{\left\{\abs{s} \leq \frac{1}{2 \sqrt{n} \[
g_{\xi}(x)}\right\}}(s)\sqrt{n} g_{\xi}(x), \, \forall s \in \mathbb{R}\\ \kappa_x(s) \coloneqq \mathds{1}_{\left\{\abs{s} \leq \frac{1}{2 \sqrt{n}
\intertext{Using this kernel we define a smooth approximation of g_{\xi}(x)}\right\}}(s)\sqrt{n} g_{\xi}(x), \, \forall s \in \mathbb{R}
$\mathcal{RN}_w$ by} \]
f^w(x) &\coloneqq \int_{\mathds{R}} \mathcal{RN}_w(x-s)
\kappa_x(s) ds. Using this kernel we define a smooth approximation of
\end{align*} $\mathcal{RN}_w$ by
\[
f^w(x) \coloneqq \int_{\mathds{R}} \mathcal{RN}_w(x-s) \kappa_x(s) ds.
\]
\end{Definition} \end{Definition}
Note that the kernel introduced in Definition~\ref{def:srsnn} Note that the kernel introduced in Definition~\ref{def:srsnn}
satisfies $\int_{\mathbb{R}}\kappa_x dx = 1$. While $f^w$ looks satisfies $\int_{\mathbb{R}}\kappa_x dx = 1$. While $f^w$ looks highly
similar to a convolution, it differs slightly as the kernel $\kappa_x(s)$ similar to a convolution, it differs slightly as the kernel $\kappa_x(s)$
is dependent on $x$. Therefore only $f^w = (\mathcal{RN}_w * is dependent on $x$. Therefore only $f^w = (\mathcal{RN}_w *
\kappa_x)(x)$ is well defined, while $\mathcal{RN}_w * \kappa$ is not. \kappa_x)(x)$ is well defined, while $\mathcal{RN}_w * \kappa$ is not.
We use $f^{w^{*,\tilde{\lambda}}}$ to describe the spline We use $f^{w^{*,\tilde{\lambda}}}$ do describe the spline
approximating the ridge penalized network approximating the ... ridge penalized network
$\mathcal{RN}^{*,\tilde{\lambda}}$. $\mathrm{RN}^{*,\tilde{\lambda}}$.
Next, we construct a randomized shallow neural network that Next we construct a randomized shallow neural network which
is designed to be close to a spline, independent from the realization of the random approximates a spline independent from the realization of the random
parameters, by approximating the splines curvature between the parameters. In order to achieve this we ...
kinks.
\begin{Definition}[Spline approximating Randomized Shallow Neural \begin{Definition}[Spline approximating Randomised Shallow Neural
Network] Network]
\label{def:sann} \label{def:sann}
Let $\mathcal{RN}$ be a randomized shallow Neural Network according Let $\mathcal{RN}$ be a randomised shallow Neural Network according
to Definition~\ref{def:rsnn} and $f^{*, \lambda}_g$ be the weighted to Definition~\ref{def:rsnn} and $f^{*, \lambda}_g$ be the weighted
cubic smoothing spline as introduced in Definition~\ref{def:wrs}. Then regression spline as introduced in Definition~\ref{def:wrs}. Then
the randomized shallow neural network approximating $f^{*, the randomised shallow neural network approximating $f^{*,
\lambda}_g$ is given by \lambda}_g$ is given by
\[ \[
\mathcal{RN}_{\tilde{w}}(x) = \sum_{k = 1}^n \tilde{w}_k \sigma(b_k + v_k x), \mathcal{RN}_{\tilde{w}}(x) = \sum_{k = 1}^n \tilde{w}_k \sigma(b_k + v_k x),
@ -496,7 +474,7 @@ kinks.
with the weights $\tilde{w}_k$ defined as with the weights $\tilde{w}_k$ defined as
\[ \[
\tilde{w}_k \coloneqq \frac{h_{k,n} v_k}{\mathbb{E}[v^2 \vert \xi \tilde{w}_k \coloneqq \frac{h_{k,n} v_k}{\mathbb{E}[v^2 \vert \xi
= \xi_k]} \left(f_g^{*, \lambda}\right)''(\xi_k). = \xi_k]} (f_g^{*, \lambda})''(\xi_k).
\] \]
\end{Definition} \end{Definition}
@ -510,16 +488,16 @@ derivative of $\mathcal{RN}_{\tilde{w}}(x)$ which is given by
x}} \tilde{w}_k v_k \nonumber \\ x}} \tilde{w}_k v_k \nonumber \\
&= \frac{1}{n} \sum_{\substack{k \in \mathbb{N} \\ &= \frac{1}{n} \sum_{\substack{k \in \mathbb{N} \\
\xi_k < x}} \frac{v_k^2}{g_{\xi}(\xi_k) \mathbb{E}[v^2 \vert \xi \xi_k < x}} \frac{v_k^2}{g_{\xi}(\xi_k) \mathbb{E}[v^2 \vert \xi
= \xi_k]} \left(f_g^{*, \lambda}\right)''(\xi_k). \label{eq:derivnn} = \xi_k]} (f_g^{*, \lambda})''(\xi_k). \label{eq:derivnn}
\end{align} \end{align}
As the expression (\ref{eq:derivnn}) behaves similarly to a As the expression (\ref{eq:derivnn}) behaves similary to a
Riemann-sum for $n \to \infty$ it will converge in probability to the Riemann-sum for $n \to \infty$ it will converge in probability to the
first derivative of $f^{*,\lambda}_g$. A formal proof of this behavior first derivative of $f^{*,\lambda}_g$. A formal proof of this behaviour
is given in Lemma~\ref{lem:s0}. is given in Lemma~\ref{lem:s0}.
In order to ensure the functions used in the proof of the convergence In order to ensure the functions used in the proof of the convergence
are well defined we need to make some assumptions about properties of the random are well defined we need to assume some properties of the random
parameters and their densities. parameters and their densities
% In order to formulate the theorem describing the convergence of $RN_w$ % In order to formulate the theorem describing the convergence of $RN_w$
% we need to make a couple of assumptions. % we need to make a couple of assumptions.
@ -528,7 +506,7 @@ parameters and their densities.
\begin{Assumption}~ \begin{Assumption}~
\label{ass:theo38} \label{ass:theo38}
\begin{enumerate}[label=(\alph*)] \begin{enumerate}[label=(\alph*)]
\item The probability density function of the kinks $\xi_k$, \item The probability density fucntion of the kinks $\xi_k$,
namely $g_{\xi}$ as defined in Definition~\ref{def:kink} exists namely $g_{\xi}$ as defined in Definition~\ref{def:kink} exists
and is well defined. and is well defined.
\item The density function $g_\xi$ \item The density function $g_\xi$
@ -536,14 +514,14 @@ parameters and their densities.
\item The density function $g_{\xi}$ is uniformly continuous on $\supp(g_{\xi})$. \item The density function $g_{\xi}$ is uniformly continuous on $\supp(g_{\xi})$.
\item $g_{\xi}(0) \neq 0$. \item $g_{\xi}(0) \neq 0$.
\item $\frac{1}{g_{\xi}}\Big|_{\supp(g_{\xi})}$ is uniformly \item $\frac{1}{g_{\xi}}\Big|_{\supp(g_{\xi})}$ is uniformly
continuous on $\supp(g_{\xi})$. continous on $\supp(g_{\xi})$.
\item The conditional distribution $\mathcal{L}(v_k|\xi_k = x)$ \item The conditional distribution $\mathcal{L}(v_k|\xi_k = x)$
is uniformly continuous on $\supp(g_{\xi})$. is uniformly continous on $\supp(g_{\xi})$.
\item $\mathbb{E}\left[v_k^2\right] < \infty$. \item $\mathbb{E}\left[v_k^2\right] < \infty$.
\end{enumerate} \end{enumerate}
\end{Assumption} \end{Assumption}
As we will prove the convergence of in the Sobolev Space, we hereby As we will prove the convergence of in the Sobolev space, we hereby
introduce it and the corresponding induced norm. introduce it and the corresponding induced norm.
\begin{Definition}[Sobolev Space] \begin{Definition}[Sobolev Space]
@ -551,7 +529,7 @@ introduce it and the corresponding induced norm.
define the Sobolev space $W^{k,p}(K)$ as the space containing all define the Sobolev space $W^{k,p}(K)$ as the space containing all
real valued functions $u \in L^p(K)$ such that for every multi-index real valued functions $u \in L^p(K)$ such that for every multi-index
$\alpha \in \mathbb{N}^n$ with $\abs{\alpha} \leq $\alpha \in \mathbb{N}^n$ with $\abs{\alpha} \leq
k$ the mixed partial derivatives k$ the mixed parial derivatives
\[ \[
u^{(\alpha)} = \frac{\partial^{\abs{\alpha}} u}{\partial u^{(\alpha)} = \frac{\partial^{\abs{\alpha}} u}{\partial
x_1^{\alpha_1} \dots \partial x_n^{\alpha_n}} x_1^{\alpha_1} \dots \partial x_n^{\alpha_n}}
@ -560,8 +538,9 @@ introduce it and the corresponding induced norm.
\[ \[
\norm{u^{(\alpha)}}_{L^p} < \infty. \norm{u^{(\alpha)}}_{L^p} < \infty.
\] \]
\todo{feritg machen}
\label{def:sobonorm} \label{def:sobonorm}
The natural norm of the Sobolev Space is given by The natural norm of the sobolev space is given by
\[ \[
\norm{f}_{W^{k,p}(K)} = \norm{f}_{W^{k,p}(K)} =
\begin{cases} \begin{cases}
@ -575,21 +554,18 @@ introduce it and the corresponding induced norm.
\] \]
\end{Definition} \end{Definition}
With the important definitions and assumptions in place, we can now With the important definitions and assumptions in place we can now
formulate the main theorem. formulate the main theorem ... the convergence of ridge penalized
% ... the convergence of ridge penalized random neural networks to adapted regression splines when the
% random neural networks to adapted cubic smoothing splines when the parameters are chosen accordingly.
% parameters are chosen accordingly.
\begin{Theorem}[Ridge Weight Penalty Corresponds to Weighted Cubic \begin{Theorem}[Ridge weight penaltiy corresponds to weighted regression spline]
Smoothing Spline]
\label{theo:main1} \label{theo:main1}
For $N \in \mathbb{N}$, arbitrary training data For $N \in \mathbb{N}$ arbitrary training data
$\left(x_i^{\text{train}}, y_i^{\text{train}} \(\left(x_i^{\text{train}}, y_i^{\text{train}}
\right)~\in~\mathbb{R}^2$, with $i \in \left\{1,\dots,N\right\}$, \right)\) and $\mathcal{RN}^{*, \tilde{\lambda}}, f_g^{*, \lambda}$
and $\mathcal{RN}^{*, \tilde{\lambda}}, f_g^{*, \lambda}$
according to Definition~\ref{def:rpnn} and Definition~\ref{def:wrs} according to Definition~\ref{def:rpnn} and Definition~\ref{def:wrs}
respectively with Assumption~\ref{ass:theo38} it holds that respectively with Assumption~\ref{ass:theo38} it holds
\begin{equation} \begin{equation}
\label{eq:main1} \label{eq:main1}
@ -605,7 +581,7 @@ formulate the main theorem.
\end{align*} \end{align*}
\end{Theorem} \end{Theorem}
As mentioned above we will prof Theorem~\ref{theo:main1} utilizing As mentioned above we will prof Theorem~\ref{theo:main1} utilizing
intermediary functions. We show that the ... functions. We show that
\begin{equation} \begin{equation}
\label{eq:main2} \label{eq:main2}
\plimn \norm{\mathcal{RN}^{*, \tilde{\lambda}} - f^{w^*}}_{W^{1, \plimn \norm{\mathcal{RN}^{*, \tilde{\lambda}} - f^{w^*}}_{W^{1,
@ -617,16 +593,16 @@ and
\plimn \norm{f^{w^*} - f_g^{*, \lambda}}_{W^{1,\infty}(K)} = 0 \plimn \norm{f^{w^*} - f_g^{*, \lambda}}_{W^{1,\infty}(K)} = 0
\end{equation} \end{equation}
and then get (\ref{eq:main1}) using the triangle inequality. In and then get (\ref{eq:main1}) using the triangle inequality. In
order to prove (\ref{eq:main2}) and (\ref{eq:main3}) we need to order to prove (\ref{eq:main2}) and (\ref{eq:main3}) we will need to
introduce a number of auxiliary lemmata, proves of which are introduce a number of auxiliary lemmmata, proves of these will be
given in \textcite{heiss2019} and Appendix~\ref{appendix:proofs}. provided in the appendix.
\begin{Lemma}[Poincar\'e Typed Inequality] \begin{Lemma}[Poincar\'e typed inequality]
\label{lem:pieq} \label{lem:pieq}
Let \(f:\mathbb{R} \to \mathbb{R}\) differentiable with \(f' : Let \(f:\mathbb{R} \to \mathbb{R}\) differentiable with \(f' :
\mathbb{R} \to \mathbb{R}\) Lebesgue integrable. Then for \(K=[a,b] \mathbb{R} \to \mathbb{R}\) Lesbeque integrable. Then for \(K=[a,b]
\subset \mathbb{R}\) with \(f(a)=0\) it holds that \subset \mathbb{R}\) with \(f(a)=0\) it holds that
\begin{equation*} \begin{equation*}
\label{eq:pti1} \label{eq:pti1}
@ -634,15 +610,14 @@ given in \textcite{heiss2019} and Appendix~\ref{appendix:proofs}.
\norm{f}_{w^{1,\infty}(K)} \leq C_K^{\infty} \norm{f}_{w^{1,\infty}(K)} \leq C_K^{\infty}
\norm{f'}_{L^{\infty}(K)}. \norm{f'}_{L^{\infty}(K)}.
\end{equation*} \end{equation*}
If additionally \(f'\) is differentiable with \(f'': \mathbb{R} \to If additionaly \(f'\) is differentiable with \(f'': \mathbb{R} \to
\mathbb{R}\) Lebesgue integrable then \mathbb{R}\) Lesbeque integrable then additionally
\begin{equation*} \begin{equation*}
\label{eq:pti2} \label{eq:pti2}
\exists C_K^2 \in \mathbb{R}_{>0} : \norm{f}_{W^{1,\infty}(K)} \leq \exists C_K^2 \in \mathbb{R}_{>0} : \norm{f}_{W^{1,\infty}(K)} \leq
C_K^2 \norm{f''}_{L^2(K)}. C_K^2 \norm{f''}_{L^2(K)}.
\end{equation*} \end{equation*}
% \proof The proof is given in the appendix... \proof The proof is given in the appendix...
% With the fundamental theorem of calculus, if % With the fundamental theorem of calculus, if
% \(\norm{f}_{L^{\infty}(K)}<\infty\) we get % \(\norm{f}_{L^{\infty}(K)}<\infty\) we get
% \begin{equation} % \begin{equation}
@ -679,12 +654,11 @@ given in \textcite{heiss2019} and Appendix~\ref{appendix:proofs}.
\begin{Lemma} \begin{Lemma}
\label{lem:cnvh} \label{lem:cnvh}
Let $\mathcal{RN}$ be a shallow Neural network. For \(\varphi : Let $\mathcal{RN}$ be a shallow Neural network. For \(\varphi :
\mathbb{R}^2 \to \mathbb{R}\) uniformly continuous such that \mathbb{R}^2 \to \mathbb{R}\) uniformly continous such that
\[ \[
\forall x \in \supp(g_{\xi}) : \mathbb{E}\left[\varphi(\xi, v) \forall x \in \supp(g_{\xi}) : \mathbb{E}\left[\varphi(\xi, v)
\frac{1}{n g_{\xi}(\xi)} \vert \xi = x \right] < \infty, \frac{1}{n g_{\xi}(\xi)} \vert \xi = x \right] < \infty,
\] \]
\clearpage
it holds, that it holds, that
\[ \[
\plimn \sum_{k \in \kappa : \xi_k < T} \varphi(\xi_k, v_k) \plimn \sum_{k \in \kappa : \xi_k < T} \varphi(\xi_k, v_k)
@ -693,7 +667,7 @@ given in \textcite{heiss2019} and Appendix~\ref{appendix:proofs}.
\mathbb{E}\left[\varphi(\xi, v) \vert \xi = x \right] dx \mathbb{E}\left[\varphi(\xi, v) \vert \xi = x \right] dx
\] \]
uniformly in \(T \in K\). uniformly in \(T \in K\).
% \proof The proof is given in appendix... \proof The proof is given in appendix...
% For \(T \leq C_{g_{\xi}}^l\) both sides equal 0, so it is sufficient to % For \(T \leq C_{g_{\xi}}^l\) both sides equal 0, so it is sufficient to
% consider \(T > C_{g_{\xi}}^l\). With \(\varphi\) and % consider \(T > C_{g_{\xi}}^l\). With \(\varphi\) and
% \(\nicefrac{1}{g_{\xi}}\) uniformly continous in \(\xi\), % \(\nicefrac{1}{g_{\xi}}\) uniformly continous in \(\xi\),
@ -738,7 +712,7 @@ given in \textcite{heiss2019} and Appendix~\ref{appendix:proofs}.
% \kappa : \xi_m \in [\delta l, \delta(l + % \kappa : \xi_m \in [\delta l, \delta(l +
% 1)]\right\}}}{ng_{\xi}(l\delta)}\right) \pm \varepsilon .\\ % 1)]\right\}}}{ng_{\xi}(l\delta)}\right) \pm \varepsilon .\\
% \intertext{We use the mean to approximate the number of kinks in % \intertext{We use the mean to approximate the number of kinks in
% each $\delta$-strip, as it follows a binomial distribution this % each $\delta$-strip, as it follows a bonomial distribution this
% amounts to % amounts to
% \[ % \[
% \mathbb{E}\left[\abs{\left\{m \in \kappa : \xi_m \in [\delta l, % \mathbb{E}\left[\abs{\left\{m \in \kappa : \xi_m \in [\delta l,
@ -749,15 +723,14 @@ given in \textcite{heiss2019} and Appendix~\ref{appendix:proofs}.
% Bla Bla Bla $v_k$} % Bla Bla Bla $v_k$}
% \circled{1} & \approx % \circled{1} & \approx
% \end{align*} % \end{align*}
\proof Notes on the proof are given in Proof~\ref{proof:lem9}.
\end{Lemma} \end{Lemma}
\begin{Lemma} \begin{Lemma}[Step 0]
For any $\lambda > 0$, $N \in \mathbb{N}$, training data $(x_i^{\text{train}} For any $\lambda > 0$, training data $(x_i^{\text{train}}
y_i^{\text{train}}) \in \mathbb{R}^2$, with $ i \in y_i^{\text{train}}) \in \mathbb{R}^2$, with $ i \in
\left\{1,\dots,N\right\}$, and subset $K \subset \mathbb{R}$ the spline approximating randomized \left\{1,\dots,N\right\}$ and subset $K \subset \mathbb{R}$ the spline approximating randomized
shallow neural network $\mathcal{RN}_{\tilde{w}}$ converges to the shallow neural network $\mathcal{RN}_{\tilde{w}}$ converges to the
cubic smoothing spline $f^{*, \lambda}_g$ in regression spline $f^{*, \lambda}_g$ in
$\norm{.}_{W^{1,\infty}(K)}$ as the node count $n$ increases, $\norm{.}_{W^{1,\infty}(K)}$ as the node count $n$ increases,
\begin{equation} \begin{equation}
\label{eq:s0} \label{eq:s0}
@ -771,91 +744,77 @@ given in \textcite{heiss2019} and Appendix~\ref{appendix:proofs}.
\lambda}_g)'}_{L^{\infty}} = 0. \lambda}_g)'}_{L^{\infty}} = 0.
\] \]
This can be achieved by using Lemma~\ref{lem:cnvh} with $\varphi(\xi_k, This can be achieved by using Lemma~\ref{lem:cnvh} with $\varphi(\xi_k,
v_k) = \frac{v_k^2}{\mathbb{E}[v^2|\xi = z]} (f^{*, \lambda}_g)''(\xi_k) $ v_k) = \frac{v_k^2}{\mathbb{E}[v^2|\xi = z]} (f^{*, \lambda}_w)''(\xi_k) $
thus obtaining thus obtaining
\begin{align*} \begin{align*}
\plimn \frac{\partial \mathcal{RN}_{\tilde{w}}}{\partial x} (x) \plimn \frac{\partial \mathcal{RN}_{\tilde{w}}}{\partial x}
\equals^{(\ref{eq:derivnn})}_{\phantom{\text{Lemma 3.1.4}}} \stackrel{(\ref{eq:derivnn})}{=}
%\stackrel{(\ref{eq:derivnn})}{=} & \plimn \sum_{\substack{k \in \mathbb{N} \\
&
\plimn \sum_{\substack{k \in \mathbb{N} \\
\xi_k < x}} \frac{v_k^2}{\mathbb{E}[v^2 \vert \xi \xi_k < x}} \frac{v_k^2}{\mathbb{E}[v^2 \vert \xi
= \xi_k]} (f_g^{*, \lambda})''(\xi_k) h_{k,n} \\ = \xi_k]} (f_g^{*, \lambda})''(\xi_k) h_{k,n}
\stackrel{\text{Lemma}~\ref{lem:cnvh}}{=} \stackrel{\text{Lemma}~\ref{lem:cnvh}}{=} \\
%\stackrel{\phantom{(\ref{eq:derivnn})}}{=} \stackrel{\phantom{(\ref{eq:derivnn})}}{=}
& &
\int_{\max\left\{C_{g_{\xi}}^l,x\right\}}^{\min\left\{C_{g_{\xi}}^u,x\right\}} \int_{\min\left\{C_{g_{\xi}}^l,T\right\}}^{min\left\{C_{g_{\xi}}^u,T\right\}}
\mathbb{E}\left[\frac{v^2}{\mathbb{E}[v^2|\xi = z]} (f^{*, \mathbb{E}\left[\frac{v^2}{\mathbb{E}[v^2|\xi = z]} (f^{*,
\lambda}_g)''(\xi) \vert \lambda}_w)''(\xi) \vert
\xi = z \right] dz\\ \xi = x \right] dx \equals^{\text{Tower-}}_{\text{property}} \\
\mathmakebox[\widthof{$\stackrel{\text{Lemma 3.14}}{=}$}][c]{\equals^{\text{Tower-}}_{\text{property}}} \stackrel{\phantom{(\ref{eq:derivnn})}}{=}
%\stackrel{\phantom{(\ref{eq:derivnn})}}{=}
& &
\int_{\max\left\{C_{g_{\xi}}^l, \int_{\min\left\{C_{g_{\xi}}^l,
x\right\}}^{\min\left\{C_{g_{\xi}}^u,x\right\}}(f^{*,\lambda}_g)''(z) T\right\}}^{min\left\{C_{g_{\xi}}^u,T\right\}}(f^{*,\lambda}_w)''(x)
dz. dx.
\end{align*} \end{align*}
With the fundamental theorem of calculus we get By the fundamental theorem of calculus and $\supp(f') \subset
\[ \supp(f)$, (\ref{eq:s0}) follows with Lemma~\ref{lem:pieq}.
\plimn \mathcal{RN}_{\tilde{w}}'(x) = f_g^{*,\lambda
'}(\min\left\{C_{g_{\xi}}^u, x\right\}) - f_g^{*,\lambda
'}(\max\left\{C_{g_{\xi}}^l, x\right\})
\]
As $f_g^{*,\lambda '}$ is constant on $\left[C_{g_\xi}^l,
C_{g_\xi}^u\right]^C$ because $\supp(f_g^{*,\lambda ''}) \subseteq
\supp(g) \subseteq \supp(g_\xi)$ we get
\[
\plimn \mathcal{RN}_{\tilde{w}}'(x) = f_g^{*,\lambda
'},
\]
thus (\ref{eq:s0}) follows with Lemma~\ref{lem:pieq}.
\qed \qed
\label{lem:s0} \label{lem:s0}
\end{Lemma} \end{Lemma}
\begin{Lemma} \begin{Lemma}[Step 2]
For any $\lambda > 0$, $N \in \mathbb{N}$, and training data $(x_i^{\text{train}}, For any $\lambda > 0$ and training data $(x_i^{\text{train}},
y_i^{\text{train}}) \in \mathbb{R}^2$, with $i \in y_i^{\text{train}}) \in \mathbb{R}^2, \, i \in
\left\{1,\dots,N\right\}$, we have \left\{1,\dots,N\right\}$, we have
\[ \[
\plimn F^{\tilde{\lambda}}_n(\mathcal{RN}_{\tilde{w}}) = \plimn F^{\tilde{\lambda}}_n(\mathcal{RN}_{\tilde{w}}) =
F^{\lambda, g}(f^{*, \lambda}_g) = 0. F^{\lambda, g}(f^{*, \lambda}_g) = 0.
\] \]
\proof Notes on the proof are given in Proof~\ref{proof:lem14}. \proof
The proof is given in the appendix...
\label{lem:s2} \label{lem:s2}
\end{Lemma} \end{Lemma}
\begin{Lemma} \begin{Lemma}[Step 3]
For any $\lambda > 0$, $N \in \mathbb{N}$, and training data $(x_i^{\text{train}}, For any $\lambda > 0$ and training data $(x_i^{\text{train}},
y_i^{\text{train}}) \in \mathbb{R}^2$, with $i \in y_i^{\text{train}}) \in \mathbb{R}^2, \, i \in
\left\{1,\dots,N\right\}$, with $w^*$ as \left\{1,\dots,N\right\}$, with $w^*$ as
defined in Definition~\ref{def:rpnn} and $\tilde{\lambda}$ as defined in Definition~\ref{def:rpnn} and $\tilde{\lambda}$ as
defined in Theorem~\ref{theo:main1}, it holds defined in Theroem~\ref{theo:main1}, it holds
\[ \[
\plimn \norm{\mathcal{RN}^{*,\tilde{\lambda}} - \plimn \norm{\mathcal{RN}^{*,\tilde{\lambda}} -
f^{w*, \tilde{\lambda}}}_{W^{1,\infty}(K)} = 0. f^{w*, \tilde{\lambda}}}_{W^{1,\infty}(K)} = 0.
\] \]
\proof Notes on the proof are given in Proof~\ref{proof:lem15}. \proof The proof is given in Appendix ..
\label{lem:s3} \label{lem:s3}
\end{Lemma} \end{Lemma}
\begin{Lemma} \begin{Lemma}[Step 4]
For any $\lambda > 0$, $N \in \mathbb{N}$, and training data $(x_i^{\text{train}}, For any $\lambda > 0$ and training data $(x_i^{\text{train}},
y_i^{\text{train}}) \in \mathbb{R}^2$, with $i \in y_i^{\text{train}}) \in \mathbb{R}^2, \, i \in
\left\{1,\dots,N\right\}$, with $w^*$ and $\tilde{\lambda}$ as \left\{1,\dots,N\right\}$, with $w^*$ and $\tilde{\lambda}$ as
defined in Definition~\ref{def:rpnn} and Theorem~\ref{theo:main1} defined in Definition~\ref{def:rpnn} and Theroem~\ref{theo:main1}
respectively, it holds respectively, it holds
\[ \[
\plimn \abs{F_n^{\tilde{\lambda}}(\mathcal{RN}^{*,\tilde{\lambda}}) - \plimn \abs{F_n^{\tilde{\lambda}}(\mathcal{RN}^{*,\tilde{\lambda}}) -
F^{\lambda, g}(f^{w*, \tilde{\lambda}})} = 0. F^{\lambda, g}(f^{w*, \tilde{\lambda}})} = 0.
\] \]
\proof Notes on the proof are given in Proof~\ref{proof:lem16}. \proof The proof is given in appendix...
\label{lem:s4} \label{lem:s4}
\end{Lemma} \end{Lemma}
\begin{Lemma} \begin{Lemma}[Step 7]
For any $\lambda > 0$, $N \in \mathbb{N}$, and training data $(x_i^{\text{train}}, For any $\lambda > 0$ and training data $(x_i^{\text{train}},
y_i^{\text{train}}) \in \mathbb{R}^2$, with $i \in y_i^{\text{train}}) \in \mathbb{R}^2, \, i \in
\left\{1,\dots,N\right\}$, for any sequence of functions $f^n \in \left\{1,\dots,N\right\}$, for any sequence of functions $f^n \in
W^{2,2}$ with W^{2,2}$ with
\[ \[
@ -865,45 +824,39 @@ given in \textcite{heiss2019} and Appendix~\ref{appendix:proofs}.
\[ \[
\plimn \norm{f^n - f^{*, \lambda}} = 0. \plimn \norm{f^n - f^{*, \lambda}} = 0.
\] \]
\proof Notes on the proof are given in Proof~\ref{proof:lem19}. \proof The proof is given in appendix ...
\label{lem:s7} \label{lem:s7}
\end{Lemma} \end{Lemma}
Using these lemmata we can now proof Theorem~\ref{theo:main1}. We Using these lemmata we can now proof Theorem~\ref{theo:main1}. We
start by showing that the error measure of the smooth approximation of start by showing that the error measure of the smooth approximation of
the ridge penalized randomized shallow neural network $F^{\lambda, the ridge penalized randomized shallow neural network $F^{\lambda,
g}(f^{w^{*,\tilde{\lambda}}})$ g}\left(f^{w^{*,\tilde{\lambda}}}\right)$
will converge in probability to the error measure of the adapted weighted regression will converge in probability to the error measure of the adapted weighted regression
spline $F^{\lambda, g}\left(f^{*,\lambda}\right)$ for the specified spline $F^{\lambda, g}\left(f^{*,\lambda}\right)$ for the specified
parameters. parameters.
Using Lemma~\ref{lem:s4} we get that for every $P \in (0,1)$ and Using Lemma~\ref{lem:s4} we get that for every $P \in (0,1)$ and
$\varepsilon > 0$ there exists a $n_1 \in \mathbb{N}$ such that $\varepsilon > 0$ there exists a $n_1 \in \mathbb{N}$ such that
\begin{equation} \[
\mathbb{P}\left[F^{\lambda, g}\left(f^{w^{*,\tilde{\lambda}}}\right) \in \mathbb{P}\left[F^{\lambda, g}\left(f^{w^{*,\tilde{\lambda}}}\right) \in
F_n^{\tilde{\lambda}}\left(\mathcal{RN}^{*,\tilde{\lambda}}\right) F_n^{\tilde{\lambda}}\left(\mathcal{RN}^{*,\tilde{\lambda}}\right)
+[-\varepsilon, \varepsilon]\right] > P, \forall n \in +[-\varepsilon, \varepsilon]\right] > P, \forall n \in \mathbb{N}_{> n_1}.
\mathbb{N}_{> n_1}. \]
\label{eq:squeeze_1}
\end{equation}
As $\mathcal{RN}^{*,\tilde{\lambda}}$ is the optimal network for As $\mathcal{RN}^{*,\tilde{\lambda}}$ is the optimal network for
$F_n^{\tilde{\lambda}}$ we know that $F_n^{\tilde{\lambda}}$ we know that
\begin{equation} \[
F_n^{\tilde{\lambda}}\left(\mathcal{RN}^{*,\tilde{\lambda}}\right) F_n^{\tilde{\lambda}}\left(\mathcal{RN}^{*,\tilde{\lambda}}\right)
\leq F_n^{\tilde{\lambda}}\left(\mathcal{RN}_{\tilde{w}}\right). \leq F_n^{\tilde{\lambda}}\left(\mathcal{RN}_{\tilde{w}}\right).
\label{eq:squeeze_2} \]
\end{equation}
Using Lemma~\ref{lem:s2} we get that for every $P \in (0,1)$ and Using Lemma~\ref{lem:s2} we get that for every $P \in (0,1)$ and
$\varepsilon > 0$ a $n_2 \in \mathbb{N}$ exists such that $\varepsilon > 0$ there exists a $n_2 \in \mathbb{N}$ such that
\begin{equation} \[
\mathbb{P}\left[F_n^{\tilde{\lambda}}\left(\mathcal{RN}_{\tilde{w}}\right) \mathbb{P}\left[F_n^{\tilde{\lambda}}\left(\mathcal{RN}_{\tilde{w}}\right)
\in F^{\lambda, g}\left(f^{*,\lambda}_g\right)+[-\varepsilon, \in F^{\lambda, g}\left(f^{*,\lambda}_g\right)+[-\varepsilon,
\varepsilon]\right] > P, \forall n \in \mathbb{N}_{> n_2}. \varepsilon]\right] > P, \forall n \in \mathbb{N}_{> n_2}.
\label{eq:squeeze_3} \]
\end{equation} If we combine these ... we get that for every $P \in (0,1)$ and
Combining (\ref{eq:squeeze_1}), (\ref{eq:squeeze_2}), and $\varepsilon > 0$ and $n_3 \geq
(\ref{eq:squeeze_3}) we get that for every $P \in (0,1)$ and for \linebreak
every
$\varepsilon > 0$ with $n_3 \geq
\max\left\{n_1,n_2\right\}$ \max\left\{n_1,n_2\right\}$
\[ \[
\mathbb{P}\left[F^{\lambda, \mathbb{P}\left[F^{\lambda,
@ -911,52 +864,45 @@ $\varepsilon > 0$ with $n_3 \geq
g}\left(f^{*,\lambda}_g\right)+2\varepsilon\right] > P, \forall g}\left(f^{*,\lambda}_g\right)+2\varepsilon\right] > P, \forall
n \in \mathbb{N}_{> n_3}. n \in \mathbb{N}_{> n_3}.
\] \]
As $\supp(f^{w^{*,\tilde{\lambda}}}) \subseteq \supp(g_\xi)$ and $f^{*,\lambda}_g$ is optimal we know that As ... is in ... and ... is optimal we know that
\[ \[
F^{\lambda, g}\left(f^{*,\lambda}_g\right) \leq F^{\lambda, F^{\lambda, g}\left(f^{*,\lambda}_g\right) \leq F^{\lambda, g}\left(f^{w^{*,\tilde{\lambda}}}\right)
g}\left(f^{w^{*,\tilde{\lambda}}}\right)
\] \]
and thus get with the squeeze theorem and thus get with the squeeze theorem
\[ \[
\plimn F^{\lambda, g}\left(f^{w^{*,\tilde{\lambda}}}\right) = F^{\lambda, g}\left(f^{*,\lambda}_g\right). \plimn F^{\lambda, g}\left(f^{w^{*,\tilde{\lambda}}}\right) = F^{\lambda, g}\left(f^{*,\lambda}_g\right).
\] \]
With Lemma~\ref{lem:s7} it follows that We can now use Lemma~\ref{lem:s7} to follow that
\begin{equation} \begin{equation}
\plimn \norm{f^{w^{*,\tilde{\lambda}}} - f^{*,\lambda}_g} \plimn \norm{f^{w^{*,\tilde{\lambda}}} - f^{*,\lambda}_g}
_{W^{1,\infty}} = 0. _{W^{1,\infty}} = 0.
\label{eq:main4} \label{eq:main2}
\end{equation} \end{equation}
By using the triangle inequality with Lemma~\ref{lem:s3} and Now by using the triangle inequality with Lemma~\ref{lem:s3} and
(\ref{eq:main4}) we get (\ref{eq:main2}) we get
\begin{multline} \begin{align*}
\plimn \norm{\mathcal{RN}^{*, \tilde{\lambda}} - f_g^{*,\lambda}}\\ \plimn \norm{\mathcal{RN}^{*, \tilde{\lambda}} - f_g^{*,\lambda}}
\leq \plimn \bigg(\norm{\mathcal{RN}^{*, \tilde{\lambda}} - \leq& \plimn \bigg(\norm{\mathcal{RN}^{*, \tilde{\lambda}} -
f_g^{w^{*,\tilde{\lambda}}}}_{W^{1,\infty}} f_g^{w^{*,\tilde{\lambda}}}}_{W^{1,\infty}}\\
+ \norm{f^{w^{*,\tilde{\lambda}}} - f^{*,\lambda}_g} &+ \norm{f^{w^{*,\tilde{\lambda}}} - f^{*,\lambda}_g}
_{W^{1,\infty}}\bigg) = 0 _{W^{1,\infty}}\bigg) = 0
\end{multline} \end{align*}
and thus have proven Theorem~\ref{theo:main1}. and thus have proven Theorem~\ref{theo:main1}.
We now know that randomized shallow neural networks behave similar to We now know that randomized shallow neural networks behave similar to
spline regression if we regularize the size of the weights during spline regression if we regularize the size of the weights during
training. training.
\textcite{heiss2019} further explore a connection between ridge penalized \textcite{heiss2019} further explore a connection between ridge penalized
networks and randomized shallow neural networks trained using gradient networks and randomized shallow neural networks which are trained
which are only trained for a certain amount of epoch using gradient
descent. descent.
They infer that the effect of weight regularization And ... that the effect of weight regularization can be achieved by
can be achieved by stopping the training of the randomized shallow training for a certain amount of iterations this ... between adapted
neural network early, with the number of iterations being proportional to weighted regression splines and randomized shallow neural networks
the tuning parameter penalizing the size of the weights. where training is stopped early.
They use this to further conclude that for a large number of training epochs and number of
neurons shallow neural networks trained with gradient descent are
very close to spline interpolations. Alternatively if the training
is stopped early, they are close to adapted weighted cubic smoothing splines.
\newpage \newpage
\subsection{Simulations} \subsection{Simulations}
\label{sec:rsnn_sim} In the following the behaviour described in Theorem~\ref{theo:main1}
In the following the behavior described in Theorem~\ref{theo:main1}
is visualized in a simulated example. For this two sets of training is visualized in a simulated example. For this two sets of training
data have been generated. data have been generated.
\begin{itemize} \begin{itemize}
@ -989,28 +935,22 @@ Theorem~\ref{theo:main1}
would equate to $g(x) = \frac{\mathbb{E}[v_k^2|\xi_k = x]}{10}$. In would equate to $g(x) = \frac{\mathbb{E}[v_k^2|\xi_k = x]}{10}$. In
order to utilize the order to utilize the
smoothing spline implemented in Mathlab, $g$ has been simplified to $g smoothing spline implemented in Mathlab, $g$ has been simplified to $g
\equiv \frac{1}{10}$ instead. \equiv \frac{1}{10}$ instead. For all figures $f_1^{*, \lambda}$ has
been calculated with Matlab's ..... As ... minimizes
For all figures $f_1^{*, \lambda}$ has
been calculated with Matlab's {\sffamily{smoothingspline}}, as this minimizes
\[ \[
\bar{\lambda} \sum_{i=1}^N(y_i^{train} - f(x_i^{train}))^2 + (1 - \bar{\lambda} \sum_{i=1}^N(y_i^{train} - f(x_i^{train}))^2 + (1 -
\bar{\lambda}) \int (f''(x))^2 dx \bar{\lambda}) \int (f''(x))^2 dx
\] \]
the smoothing parameter used for fitment is $\bar{\lambda} = the smoothing parameter used for fittment is $\bar{\lambda} =
\frac{1}{1 + \lambda}$. The parameter $\tilde{\lambda}$ for training \frac{1}{1 + \lambda}$. The parameter $\tilde{\lambda}$ for training
the networks is chosen as defined in Theorem~\ref{theo:main1}. the networks is chosen as defined in Theorem~\ref{theo:main1} and each
one is trained on the full training data for 5000 epoch using
Each
network contains 10.000 hidden nodes and is trained on the full
training data for 100.000 epochs using
gradient descent. The gradient descent. The
results are given in Figure~\ref{fig:rn_vs_rs}, where it can be seen results are given in Figure~\ref{fig:rs_vs_rs}, here it can be seen that in
that the neural network and the intervall of the traing data $[-\pi, \pi]$ the neural network and
smoothing spline are nearly identical, coinciding with the smoothing spline are nearly identical, coinciding with the proposition.
proposition.
\input{Figures/RN_vs_RS} \input{Plots/RN_vs_RS}
%%% Local Variables: %%% Local Variables: