How to show Feature Names in Graphviz?

Question

I'm building a tree in Graphviz and I can't seem to be able to get the feature names to show up, I have defined a list with the feature names like so:

names = list(df.columns.values)

Which prints:

    ['Gender',
 'SuperStrength',
 'Mask',
 'Cape',
 'Tie',
 'Bald',
 'Pointy Ears',
 'Smokes']

So the list is being created, later I build the tree like so:

 export_graphviz(tree, out_file=ddata, filled=True, rounded=True, special_characters=False, impurity=False, feature_names=names)

But the final image still has the feature names listed like X[]:

How can I get the actual feature names to show up? (Cape instead of X[3], etc.)

Answer 1

I can only imagine this has to do with passing the names as an array of the values. It works fine if you pass the columns directly:

export_graphviz(tree, out_file=ddata, filled=True, rounded=True, special_characters=False, impurity=False, feature_names=df.columns)

If needed, you can also slice the columns:

export_graphviz(tree, out_file=ddata, filled=True, rounded=True, special_characters=False, impurity=False, feature_names=df.columns[5:])