figure8-14-a-message-passing-input-graph.tex

\documentclass[border=0.2cm]{standalone}

\usepackage{tikz}
\usetikzlibrary{shapes.geometric, shapes.misc}
\usetikzlibrary{cd, fit, calc}
\usetikzlibrary{positioning}
\usepackage{medl_colors}

\begin{document}
\begin{tikzpicture}

\node [redshape,circle,minimum size=5mm] (node11) {$v_3$};
\node [lightgreenshape,circle,above of=node11,node distance=3cm,xshift=1.5cm] (node12) {$v_1$};
\node [greenshape,circle,right of=node11,node distance=1cm,yshift=0.8cm, xshift=1.5cm] (node13) {$v_2$};
\node [yellowshape, circle, below of=node11,node distance=1cm,xshift=2cm] (node14) {$v_4$};
\node [lightblueshape,circle,right of=node14,node distance=2cm,xshift=-0.2cm] (node15) {$v_5$};
\node [lightgreyshape,circle,right of=node13,node distance=2cm, yshift=1cm] (node16) {$v_6$};
\node [below of=node11,node distance=1cm](node17){Target Node};

\draw [thickline](node11) -- (node12) {};
\draw [thickline](node11) -- (node13) {};
\draw [thickline](node11) -- (node14) {};
\draw [thickline](node12) -- (node13) {};
\draw [thickline](node13) -- (node16) {};
\draw [thickline](node15) -- (node14) {};
%\draw[-Triangle] (node17) -- (node11) {};

\end{tikzpicture}
\end{document}