fig-sigmoid.tex

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 \begin{tikzpicture}
        \draw[->](-1.2,0)--(1.2,0)node[left,below,font=\tiny]{$x$};
        \draw[->](0,-1.2)--(0,1.2)node[right,font=\tiny]{$y$};
        \draw[dashed](-1.2,1)--(1.2,1);
        \foreach \x in {-1,-0.5,0,0.5,1}{\draw(\x,0)--(\x,0.05)node[below,outer sep=2pt,font=\tiny]at(\x,0){
            \pgfmathparse{(\x)*5}
            \pgfmathresult};}
        \foreach \y in {0.5,1.0}{\draw(0,\y)--(0.05,\y)node[left,outer sep=2pt,font=\tiny]at(0,\y){\y};}
        \draw[color=red,domain=-1.2:1.2]plot(\x,{1/(1+(exp(-5*\x)))});
        \node[black,anchor=south] at (0,1.2) {\small $y = \frac{1}{1+e^{-x}}$};
        \end{tikzpicture}
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