fluxograma.tex

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{shapes, arrows}
\usepackage[utf8]{inputenc}
   
\begin{document}
   % Definir estilo dos blocos
   \tikzstyle{decision} = [diamond, draw, fill=blue!20, text width=4.5em, text centered, node distance=2cm, inner sep=0pt]
   \tikzstyle{block} = [rectangle, draw, fill=blue!20, text width=5em, text centered, rounded corners]
   \tikzstyle{line} = [draw, -latex']
   \tikzstyle{cloud} = [draw, ellipse,fill=red!20, node distance=2cm]
   \begin{tikzpicture}[node distance = 1cm, auto]
      % Nós
      \node [block] (init) {inicializar};
      \node [cloud, left of=init] (dados) {dados};
      \node [block, below of=init] (identify) {identificar modelo};
      \node [block, below of=identify] (evaluate) {avaliar modelo};
      \node [block, left of=evaluate, node distance=2cm] (update) {atualizar modelo};
      \node [decision, below of=evaluate] (decide) {o modelo é válido?};
      \node [block, below of=decide, node distance=2cm] (stop) {pare};
      % Arestas
      \path [line] (init) -- (identify);
      \path [line] (identify) -- (evaluate);
      \path [line] (evaluate) -- (decide);
      \path [line] (decide) -| node [near start] {não} (update);
      \path [line] (update) |- (identify);
      \path [line] (decide) -- node {sim}(stop);
      \path [line,dashed] (dados) -- (init);
   \end{tikzpicture}
\end{document}