digraph BayesNet {
label=<BayesNet >
fontsize=30
fontcolor=blue
labelloc=t
layout=circo
 class [shape=circle, fontcolor=red, fillcolor=lightblue, style=filled ] 
 class -> sepallength class -> sepalwidth class -> petallength class -> petalwidth petallength [shape=circle] 
 petallength -> sepallength petalwidth [shape=circle] 
 sepallength [shape=circle] 
 sepallength -> sepalwidth sepalwidth [shape=circle] 
 sepalwidth -> petalwidth }