Get some graphs going

latex_examples/nn.tex

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+\documentclass{article}
+
+\usepackage{tikz}
+\usepackage{verbatim}
+
+\begin{comment}
+:Title: Neural network
+:Tags: Foreach
+
+The ``\foreach`` command is very useful for quickly creating structured graphics
+like this neural network diagram.
+
+\end{comment}
+
+\begin{document}
+\pagestyle{empty}
+
+\def\layersep{2.5cm}
+
+\begin{figure}
+\begin{tikzpicture}[shorten >=1pt,->,draw=black!50, node distance=\layersep]
+    \tikzstyle{every pin edge}=[<-,shorten <=1pt]
+    \tikzstyle{fmmde}=[circle,fill=black!25,minimum size=17pt,inner sep=0pt]
+    \tikzstyle{component}=[fmmde, fill=green!50];
+    \tikzstyle{failure}=[fmmde, fill=red!50];
+    \tikzstyle{symptom}=[fmmde, fill=blue!50];
+    \tikzstyle{annot} = [text width=4em, text centered]
+
+    % Draw the input layer nodes
+    \foreach \name / \y in {1,...,4}
+    % This is the same as writing \foreach \name / \y in {1/1,2/2,3/3,4/4}
+        \node[component, pin=left:Input \#\y] (I-\name) at (0,-\y) {};
+
+    % Draw the hidden layer nodes
+    \foreach \name / \y in {1,...,5}
+        \path[yshift=0.5cm]
+            node[failure] (H-\name) at (\layersep,-\y cm) {};
+
+    % Draw the output layer node
+    \node[symptom,pin={[pin edge={->}]right:Output}, right of=H-3] (O) {};
+
+    % Connect every node in the input layer with every node in the
+    % hidden layer.
+    \foreach \source in {1,...,4}
+        \foreach \dest in {1,...,5}
+            \path (I-\source) edge (H-\dest);
+
+    % Connect every node in the hidden layer with the output layer
+    \foreach \source in {1,...,5}
+        \path (H-\source) edge (O);
+
+    % Annotate the layers
+    \node[annot,above of=H-1, node distance=1cm] (hl) {Hidden layer};
+    \node[annot,left of=hl] {Input layer};
+    \node[annot,right of=hl] {Output layer};
+\end{tikzpicture}
+% End of code
+\caption{bollocks}
+\end{figure}
+
+\end{document}
+