pr1_graph2.dot

digraph G {
    Parameter_0 -> Abs_1 -> Negative_2 -> Negative_3;
    Parameter_0 [shape=box color=blue]
    Abs_1 [shape=ellipse color=black]
    Negative_2 [shape=ellipse color=black]
    Negative_3 [shape=ellipse color=black]
}