\documentclass{article} \usepackage{tikz} \usetikzlibrary{matrix,chains,positioning,decorations.pathreplacing,arrows} \begin{document} \begin{tikzpicture}[ plain/.style={ draw=none, fill=none, }, net/.style={ matrix of nodes, nodes={ draw, circle, inner sep=10pt }, nodes in empty cells, column sep=2cm, row sep=-9pt }, >=latex ] \matrix[net] (mat) { |[plain]| \parbox{1.3cm}{\centering Input\\layer} & |[plain]| \parbox{1.3cm}{\centering Hidden\\layer} & |[plain]| \parbox{1.3cm}{\centering Output\\layer} \\ & |[plain]| \\ |[plain]| & \\ & |[plain]| \\ |[plain]| & |[plain]| \\ & & \\ |[plain]| & |[plain]| \\ & |[plain]| \\ |[plain]| & \\ & |[plain]| \\ }; \foreach \ai [count=\mi ]in {2,4,...,10} \draw[<-] (mat-\ai-1) -- node[above] {Input \mi} +(-2cm,0); \foreach \ai in {2,4,...,10} {\foreach \aii in {3,6,9} \draw[->] (mat-\ai-1) -- (mat-\aii-2); } \foreach \ai in {3,6,9} \draw[->] (mat-\ai-2) -- (mat-6-3); \draw[->] (mat-6-3) -- node[above] {Ouput} +(2cm,0); \end{tikzpicture} \begin{tikzpicture}[ init/.style={ draw, circle, inner sep=2pt, font=\Huge, join = by -latex }, squa/.style={ draw, inner sep=2pt, font=\Large, join = by -latex }, start chain=2,node distance=13mm ] \node[on chain=2] (x2) {$x_2$}; \node[on chain=2,join=by o-latex] {$w_2$}; \node[on chain=2,init] (sigma) {$\displaystyle\Sigma$}; \node[on chain=2,squa,label=above:{\parbox{2cm}{\centering Activate \\ function}}] {$f$}; \node[on chain=2,label=above:Output,join=by -latex] {$y$}; \begin{scope}[start chain=1] \node[on chain=1] at (0,1.5cm) (x1) {$x_1$}; \node[on chain=1,join=by o-latex] (w1) {$w_1$}; \end{scope} \begin{scope}[start chain=3] \node[on chain=3] at (0,-1.5cm) (x3) {$x_3$}; \node[on chain=3,label=below:Weights,join=by o-latex] (w3) {$w_3$}; \end{scope} \node[label=above:\parbox{2cm}{\centering Bias \\ $b$}] at (sigma|-w1) (b) {}; \draw[-latex] (w1) -- (sigma); \draw[-latex] (w3) -- (sigma); \draw[o-latex] (b) -- (sigma); \draw[decorate,decoration={brace,mirror}] (x1.north west) -- node[left=10pt] {Inputs} (x3.south west); \end{tikzpicture} \end{document}