GraphViz's executables not found

Question

I tried to run this code on mac,

from IPython.display import Image

dt_feature_names = list(X.columns)

dt_target_names = [str(s) for s in Y.unique()]

tree.export_graphviz(clf, out_file='tree.dot',

feature_names=dt_feature_names, class_names=dt_target_names,

filled=True)

graph = pydotplus.graph_from_dot_file('tree.dot')

Image(graph.create_png())

however, an error message keep popping up.

Answer 1

In a terminal, type dot -V. If it returns a dot (version info), set the PATH variable. Otherwise, install dot.