使用latex绘制多层神经网络结构图

1，使用Tikz包；

2，参考官方例程单层神经网络结构，绘制了一个含有3隐藏层的BP神经网络节点图

代码如下：

 1 \documentclass{article}
 2 
 3 \usepackage{tikz}
 4 \begin{document}
 5 \pagestyle{empty}
 6 
 7 \def\layersep{2.5cm}
 8 
 9 \begin{tikzpicture}[shorten >=1pt,->,draw=black!50, node distance=\layersep]
10     \tikzstyle{every pin edge}=[<-,shorten <=1pt]
11     \tikzstyle{neuron}=[circle,fill=black!25,minimum size=17pt,inner sep=0pt]
12     \tikzstyle{input neuron}=[neuron, fill=green!50];
13     \tikzstyle{output neuron}=[neuron, fill=red!50];
14 
15     \tikzstyle{hidden neuron1}=[neuron, fill=blue!50];
16     \tikzstyle{hidden neuron2}=[neuron, fill=blue!50];
17     \tikzstyle{hidden neuron3}=[neuron, fill=blue!50];
18 
19     \tikzstyle{annot} = [text width=4em, text centered]
20 
21     % Draw the input layer nodes
22     \foreach \name / \y in {1,...,4}
23     % This is the same as writing \foreach \name / \y in {1/1,2/2,3/3,4/4}
24         \node[input neuron, pin=left:Input \#\y] (I-\name) at (0,-\y) {};
25 
26     % Draw the hidden layer1 nodes
27     \foreach \name / \y in {1,...,5}
28         \path[yshift=0.5cm]
29             node[hidden neuron1] (H1-\name) at (\layersep,-\y cm) {};
30    %Draw the hidden layer2 nodes
31     \foreach \name / \y in {1,...,5}
32         \path[yshift=0.5cm]
33             node[hidden neuron2,right of=H1] (H2-\name) at (\layersep,-\y cm){};
34     %Draw the hidden layer3 nodes
35     \foreach \name / \y in {1,...,5}
36         \path[yshift=0.5cm]
37             node[hidden neuron3,right of=H2] (H3-\name) at (2*\layersep,-\y cm){};
38 
39     % Draw the output layer node
40     \node[output neuron,pin={[pin edge={->}]right:Output}, right of=H3-3] (O) {};
41 
42     % Connect every node in the input layer with every node in the
43     % hidden layer.
44     \foreach \source in {1,...,4}
45         \foreach \dest in {1,...,5}
46             \path (I-\source) edge (H1-\dest);
47     %
48     \foreach \source in {1,...,5}
49         \foreach \dest in {1,...,5}
50             \path (H1-\source) edge (H2-\dest);
51     %
52     \foreach \source in {1,...,5}
53         \foreach \dest in {1,...,5}
54             \path (H2-\source) edge (H3-\dest);
55     % Connect every node in the hidden layer with the output layer
56     \foreach \source in {1,...,5}
57         \path (H3-\source) edge (O);
58 
59     % Annotate the layers
60     \node[annot,above of=H1-1, node distance=1cm] (hl) {Hidden layer1};
61     \node[annot,left of=hl] {Input layer};
62     \node[annot,right of=hl] (h2){Hidden layer2};
63     \node[annot,right of=h2] (h3){Hidden layer3};
64     \node[annot,right of=h3] {Output layer};
65 \end{tikzpicture}
66 % End of code
67 \end{document}

效果如图：