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2024-04-11 14:20:28 +08:00
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commit 8fc38ca6c5
25 changed files with 388 additions and 49 deletions

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hw2/report/img/stn/stn.jpg Normal file

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@@ -10,39 +10,48 @@
\usepackage{enumitem}
\usepackage{graphicx}
\usepackage{listings}
\usepackage{color}
\usepackage{fontspec}
\usepackage{xcolor}
\usepackage{float}
% \usepackage{color}
\newfontfamily\codefont[Ligatures=ResetAll]{Fira Code}[Contextuals={Alternate}]
\newfontfamily\cascadia{Cascadia Code}
\lstset{
basicstyle = \sffamily, % 基本代码风格
keywordstyle = \bfseries, % 关键字风格
commentstyle = \rmfamily\itshape, % 注释的风格,斜体
stringstyle = \ttfamily, % 字符串风格
flexiblecolumns, % 别问为什么,加上这个
numbers = left, % 行号的位置在左边
showspaces = false, % 是否显示空格,显示了有点乱,所以不现实了
numberstyle = \zihao{-5}\ttfamily, % 行号的样式小五号tt等宽字体
basicstyle = \small\codefont,
% ---
tabsize = 4,
showstringspaces = false,
captionpos = t, % 这段代码的名字所呈现的位置t指的是top上面
frame = lrtb, % 显示边框
numbers = left,
numberstyle = \codefont,
% ---
breaklines = true,
captionpos = t,
% ---
frame = l,
flexiblecolumns,
}
\lstdefinestyle{Python}{
language = Python, % 语言选Python
basicstyle = \zihao{-5}\ttfamily,
numberstyle = \zihao{-5}\ttfamily,
keywordstyle = \color{blue},
keywordstyle = [2] \color{teal},
stringstyle = \color{magenta},
commentstyle = \color{red}\ttfamily,
breaklines = true, % 自动换行,建议不要写太长的行
columns = fixed, % 如果不加这一句,字间距就不固定,很丑,必须加
basewidth = 0.5em,
stringstyle = \color{orange!80!black},
commentstyle = \color{red},
identifierstyle = \color{blue!80!white},
}
\lstdefinestyle{Bash}{
language = bash
}
\usepackage{subcaption}
\usepackage{booktabs} % toprule
\usepackage[mathcal]{eucal}
\usepackage[thehwcnt = 2]{iidef}
\allowdisplaybreaks
\thecourseinstitute{清华大学电子工程系}
\thecoursename{\textbf{媒体与认知} \space 课堂2}
\theterm{2023-2024学年春季学期}
@@ -54,13 +63,13 @@
\centerline{\textbf{\Large{理论部分}}}
\section{单选题15分}
\subsection{\underline{A}}
\subsection{\underline{C}}
\subsection{\underline{D}}
\subsection{\underline{D}}
\subsection{\underline{D}}
\subsection{\underline{C}}
\subsection{\underline{B}}
@@ -118,57 +127,58 @@ W=\left[ \begin{array}{cc}
\begin{align*}
\frac{\partial L}{\partial X} & =
\begin{bmatrix}
0.3 & 0.1 & 0\\
-0.4 & 0.2 & 0\\
0.1 & -0.2 & 0\\
-0.3 & 0.4 & 0\\
0 & 0 & 0
\end{bmatrix} \frac{\partial L}{\partial Y_{11}}
+
\begin{bmatrix}
0 & 0.3 & 0.1\\
0 & -0.4 & 0.2\\
0 & 0.1 & -0.2\\
0 & -0.3 & 0.4\\
0 & 0 & 0
\end{bmatrix} \frac{\partial L}{\partial Y_{12}}\\
& \quad +
\begin{bmatrix}
0 & 0 & 0\\
0.3 & 0.1 & 0\\
-0.4 & 0.2 & 0
0.1 & -0.2 & 0\\
-0.3 & 0.4 & 0
\end{bmatrix} \frac{\partial L}{\partial Y_{21}}
+
\begin{bmatrix}
0 & 0 & 0\\
0 & 0.3 & 0.1\\
0 & -0.4 & 0.2
0 & 0.1 & -0.2\\
0 & -0.3 & 0.4
\end{bmatrix} \frac{\partial L}{\partial Y_{22}}\\
& = \mathrm{zeropad}(W) \ast \frac{\partial L}{\partial Y}\\
& =
\begin{bmatrix}
0.09 & 0.03 & 0\\
-0.12 & 0.06 & 0\\
0.03 & -0.06 & 0\\
-0.09 & 0.12 & 0\\
0 & 0 & 0
\end{bmatrix}
+
\begin{bmatrix}
0 & 0.03 & 0.01\\
0 & -0.04 & 0.02\\
0 & 0.01 & -0.02\\
0 & -0.03 & 0.04\\
0 & 0 & 0
\end{bmatrix}\\
& \quad +
\begin{bmatrix}
0 & 0 & 0\\
-0.12 & -0.04 & 0\\
0.16 & -0.08 & 0
-0.04 & 0.08 & 0\\
0.12 & -0.16 & 0
\end{bmatrix}
+
\begin{bmatrix}
0 & 0 & 0\\
0 & 0.06 & 0.02\\
0 & -0.08 & 0.04
0 & 0.02 & -0.04\\
0 & -0.06 & 0.08
\end{bmatrix}\\
& =
\begin{bmatrix}
0.09 & 0.06 & 0.01\\
-0.24 & 0.04 & 0.04\\
0.16 & -0.16 & 0.04
0.03 & -0.05 & -0.02\\
-0.13 & 0.19 & 0\\
0.12 & -0.22 & 0.08
\end{bmatrix} \qedhere
\end{align*}
\end{proof}
@@ -178,7 +188,153 @@ W=\left[ \begin{array}{cc}
% 请根据是否选择自选课题的情况选择“编程作业报告”或“自选课题开题报告”中的一项完成
\section{编程作业报告}
\section{自选课题工作进度汇报}
\subsection{探究batch normalization和dropout的作用}
\begin{enumerate}
\item 使用默认配置训练模型:
\begin{lstlisting}[style=Bash]
python train.py --ckpt_path checkpoints/default
\end{lstlisting}
\begin{figure}[H]
\centering
\includegraphics[width=\linewidth]{img/models/default/loss_and_acc.jpg}
\end{figure}
之后测试得到的正确率为90.8\%
\item 启用batch normalization
\begin{lstlisting}[style=Bash]
python train.py --ckpt_path checkpoints/bn --bn
\end{lstlisting}
\begin{figure}[H]
\centering
\includegraphics[width=\linewidth]{img/models/bn/loss_and_acc.jpg}
\end{figure}
测试得到的正确率为95.9\%
\item 启用dropout并设置概率为0.3
\begin{lstlisting}[style=Bash]
python train.py --ckpt_path checkpoints/dropout --dropout 0.3
\end{lstlisting}
\begin{figure}[H]
\centering
\includegraphics[width=\linewidth]{img/models/dropout/loss_and_acc.jpg}
\end{figure}
测试后得到的正确率为94.1\%
\end{enumerate}
\subsection{探究数据增广的作用}
考虑到在不同的视角下,交通标志可能有旋转或者变形,因此使用
\begin{lstlisting}[style=Python]
transforms.RandomAffine(degrees=30,shear=10)
\end{lstlisting}
来对数据进行随机的形变与旋转;另外,考虑到可能在不同的光线条件下导致对比度变化,因此使用
\begin{lstlisting}[style=Python]
transforms.RandomAutocontrast()
\end{lstlisting}
来对数据进行随机的对比度调整。
执行
\begin{lstlisting}[style=Bash]
python unit_test.py data_loader
\end{lstlisting}
得到
\begin{figure}[H]
\centering
\includegraphics[width=\linewidth]{img/augmentation.jpg}
\caption{数据增广后的结果}
\end{figure}
训练最优模型使用的命令为
\begin{lstlisting}[style=Bash]
python train.py --ckpt_path checkpoints/bn_aug --bn --augment --epoch 20
\end{lstlisting}
\begin{figure}[H]
\centering
\includegraphics[width=\linewidth]{img/models/bn_aug/loss_and_acc.jpg}
\end{figure}
测试得到的正确率为96.0\%,略微高于不使用数据增强时的结果。
\subsection{探究空间变换网络STN的作用}
运行
\begin{lstlisting}[style=Bash]
python train.py --ckpt_path checkpoints/stn --bn --stn
\end{lstlisting}
\begin{figure}[H]
\centering
\includegraphics[width=\linewidth]{img/models/stn/loss_and_acc.jpg}
\end{figure}
测试得到的正确率为94.6\%。正确率比不使用stn反而有所降低可能是设计的网络结构不够理想导致的。
\subsection{可视化}
\begin{enumerate}
\item 可视化各层卷积核:
\begin{figure}[H]
\centering
\includegraphics[width=\linewidth]{img/filter/filter_layer_0.jpg}
\caption{第0层的卷积核}
\end{figure}
\begin{figure}[H]
\centering
\includegraphics[width=\linewidth]{img/filter/filter_layer_1.jpg}
\caption{第1层的卷积核}
\end{figure}
\begin{figure}[H]
\centering
\includegraphics[width=\linewidth]{img/filter/filter_layer_2.jpg}
\caption{第2层的卷积核}
\end{figure}
\begin{figure}[H]
\centering
\includegraphics[width=\linewidth]{img/filter/filter_layer_3.jpg}
\caption{第3层的卷积核}
\end{figure}
\begin{figure}[H]
\centering
\includegraphics[width=\linewidth]{img/filter/filter_layer_4.jpg}
\caption{第4层的卷积核}
\end{figure}
\item 可视化各层卷积层的输出特征图
\begin{figure}[H]
\centering
\includegraphics[width=\linewidth]{img/feature/layer_0/feature_map.jpg}
\caption{第0层的卷积核特征图}
\end{figure}
\begin{figure}[H]
\centering
\includegraphics[width=\linewidth]{img/feature/layer_1/feature_map.jpg}
\caption{第1层的卷积核特征图}
\end{figure}
\begin{figure}[H]
\centering
\includegraphics[width=\linewidth]{img/feature/layer_2/feature_map.jpg}
\caption{第2层的卷积核特征图}
\end{figure}
\begin{figure}[H]
\centering
\includegraphics[width=\linewidth]{img/feature/layer_3/feature_map.jpg}
\caption{第3层的卷积核特征图}
\end{figure}
\begin{figure}[H]
\centering
\includegraphics[width=\linewidth]{img/feature/layer_4/feature_map.jpg}
\caption{第4层的卷积核特征图}
\end{figure}
\item t-SNE可视化最后一层隐藏层的输出特征
\begin{figure}[H]
\centering
\includegraphics[width=\linewidth]{img/tsne/tsne.jpg}
\end{figure}
t-SNE最后一层的隐藏层的输出证明不同类别的输入已经被通过非线性变换分类到了不同的聚类。
\item STN学习到的变换
\begin{figure}[H]
\centering
\includegraphics[width=\linewidth]{img/stn/stn.jpg}
\end{figure}
网络尽可能将所有的路牌都变换到了同样的倾斜角度。
\end{enumerate}
\section{遇到的问题与解决办法}
在自定义STN网络的时候我最开始使用了比较小的卷积核使得STN的效果很差使用之后会使得正确率只有80\%之后我分析认为STN主要要感知整个图片的倾斜以及旋转情况需要较大的视野因此选择了较大的卷积核之后得到了比较理想的效果。
完成作业没有使用大模型。
% \section{自选课题工作进度汇报}
\end{document}