fixed template

docs/source/_figures/add.tex

-\documentclass[class=minimal]{standalone}
-
-\usepackage{tikz}
-\usetikzlibrary{shapes.geometric}
-\newcommand{\tiny}[1]{\scalebox{0.45}{#1}}
-
-\def\index{{0, 0, 1, 0, 2, 2, 3, 3}}
-\def\input{{5, 1, 7, 2, 3, 2, 1, 3}}
-\def\output{{8, 7, 5, 4}}
-\def\color{{"cyan", "orange", "olive", "magenta"}}
+\def\indices{{0, 0, 1, 0, 2, 2, 3, 3}}
+\def\inputs{{5, 1, 7, 2, 3, 2, 1, 3}}
+\def\outputs{{8, 7, 5, 4}}
+\def\colors{{"cyan", "orange", "olive", "magenta"}}
 \def\numberInputs{7}
 \def\numberOutputs{3}
-\def\operation{+}
-
-\begin{document}
+\def\operation{add}
 \input{template}
-\end{document}

docs/source/_figures/template.tex

+\documentclass[class=minimal]{standalone}
+
+\usepackage{tikz}
+\usetikzlibrary{shapes.geometric}
+\newcommand{\tiny}[1]{\scalebox{0.45}{#1}}
+
+\begin{document}
+
 \begin{tikzpicture}
 
 \tikzstyle{title}=[text width=1.1cm, inner sep=0pt]
 \tikzstyle{square}=[rectangle, draw, minimum width=0.5cm, minimum height=0.5cm, inner sep=0pt, fill opacity=0.5, text opacity=1]
-\tikzstyle{op}=[ellipse, draw, inner sep=-1pt, minimum height=8pt, minimum width=8pt]
-\tikzstyle{edge1}=[->]
-\tikzstyle{edge2}=[out=-90, in=90, looseness=0.85]
+\tikzstyle{op}=[ellipse, draw, inner sep=0pt, minimum height=8pt, minimum width=8pt]
+\tikzstyle{edge}=[->]
+\tikzstyle{round}=[out=-90, in=90, looseness=0.85]
 
 \node[title] at (-0.8, 2.2) {index};
 \node[title] at (-0.8, 1.5) {input};
 \foreach \i in {0,...,\numberInputs} {
-  \pgfmathparse{\index[\i]}\let\idx\pgfmathresult
-  \pgfmathparse{\input[\i]}\let\in\pgfmathresult
-  \pgfmathparse{\color[\idx]}\let\co\pgfmathresult
+  \pgfmathparse{\indices[\i]}\let\idx\pgfmathresult
+  \pgfmathparse{\inputs[\i]}\let\in\pgfmathresult
+  \pgfmathparse{\colors[\idx]}\let\co\pgfmathresult
   \node[square] (index\i) at (\i * 0.5, 2.2) {\idx};
   \node[square, fill=\co] (input\i) at (\i * 0.5, 1.5) {\in};
-  \draw[edge1] (index\i) -- (input\i);
+  \draw[edge] (index\i) -- (input\i);
 }
 
 \node[title] at (-0.8, 0.0) {output};
 \foreach \i in {0,...,\numberOutputs} {
-  \pgfmathparse{\output[\i]}\let\out\pgfmathresult
-  \pgfmathparse{\color[\i]}\let\co\pgfmathresult
+  \pgfmathparse{\outputs[\i]}\let\out\pgfmathresult
+  \pgfmathparse{\colors[\i]}\let\co\pgfmathresult
   \def \x{(\numberInputs - \numberOutputs) * 0.25 + \i * 0.5}
   \node[op] (op\i) at ({\x}, 0.6) {\tiny{\operation}};
   \node[square, fill=\co] (output\i) at ({\x}, 0.0) {\out};
-  \draw[edge1] (op\i) -- (output\i);
+  \draw[edge] (op\i) -- (output\i);
 }
 
 \foreach \i in {0,...,\numberInputs} {
-  \pgfmathparse{\index[\i]}\let\idx\pgfmathresult
-  \draw[edge1] (input\i) to[edge2] (op\idx);
+  \pgfmathparse{\indices[\i]}\let\idx\pgfmathresult
+  \draw[edge] (input\i) to[round] (op\idx);
 }
 
 \end{tikzpicture}
+
+\end{document}