level_1_dfd.tex

% Data flow diagram
% Template adapted from http://www.texample.net/tikz/examples/data-flow-diagram/ by David Fokkema
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{arrows,shapes}

% Custom, should be provided in the same directory.
\usepackage{datastore}

\begin{document}
\begin{tikzpicture}[
  font=\sffamily,
  every matrix/.style={ampersand replacement=\&,column sep=1cm,row sep=1cm},
  interface/.style={draw,thick,regular polygon,regular polygon sides=4,inner sep=0},
  process/.style={draw,thick,rounded corners,inner sep=.3 cm},
  datastore/.style={draw,thick,shape=datastore,inner sep=.3cm},
  to/.style={->,>=stealth',shorten >=1pt,semithick,font=\sffamily\footnotesize},
  every node/.style={scale=0.9,align=center}]

  % Position the nodes using a matrix layout
  \matrix{
    \node[interface] (researcher) {Researcher};
      \& \node[process] (wikilabels) {Wiki labels};
        \& \node[interface] (labeler) {Labeler}; \\
      \& \node[process] (train) {Train AI}; \\
    \node[interface] (recentchanges) {Recent changes \\ feed};
      \& \node[datastore] (models) {Models}; \\
      \& \node[process] (ores) {ORES scoring};
        \& \node[interface] (statsd) {statsd}; \\
      \& \node[datastore] (scoredb) {Score cache}; \\
      \& \node[process] (oresapi) {ORES API}; \\
      \& \node[interface] (consumer) {ORES consumer}; \\
  };

  \node [below=2cm, align=flush center] at (consumer)
  {\Large ORES: Overview, level 1 \\ \normalsize data flow diagram};

  % Draw and label arrows between nodes.
  \draw[to] (recentchanges) -- node[midway,left] {new revisions} (ores);
  \draw[to] (researcher) -- node[midway,above] {experiments} (wikilabels);
  \draw[to] (labeler) -- node[midway,above] {hand coding} (wikilabels);
  \draw[to] (wikilabels) -- node[midway,left] {test and \\ training sets} (train);
  \draw[to] (train) -- (models);
  \draw[to] (models) -- (ores);
  \draw[to] (ores) -- node[midway,right] {scores} (scoredb);
  \draw[to] (scoredb) -- node[midway,right] {scores} (oresapi);
  \draw[to] (ores) -- node[midway,above] {metrics} (statsd);
  \draw[to] (oresapi) -- (consumer);
\end{tikzpicture}
\end{document}