We should probably be escaping feature names internally. It's easy to
forget that graphviz supports HTML-like markup.
On 14 March 2016 at 08:00, Andreas Mueller <t3k...@gmail.com> wrote:
> Try escaping the &.
>
> On 03/12/2016 02:57 PM, Raphael C wrote:
> > The code snippet should have been
> >
> >
> > reg = DecisionTreeRegressor(max_depth=None,min_samples_split=1)
> > reg.fit(X,Y)
> > scores = cross_val_score(reg, X, Y)
> > print scores
> > dot_data = StringIO()
> > tree.export_graphviz(reg, out_file=dot_data,
> > feature_names=feature_names,
> > filled=True, rounded=True,
> > special_characters=True)
> > graph = pydot.graph_from_dot_data(dot_data.getvalue())
> > Image(graph.create_png()
> >
> > Raphael
> >
> > On 12 March 2016 at 13:56, Raphael C <drr...@gmail.com> wrote:
> >> I am attempting to draw a decision tree using:
> >>
> >> reg = DecisionTreeRegressor(max_depth=None,min_samples_split=1)
> >> reg.fit(X,Y)
> >> dot_data = StringIO()
> >> tree.export_graphviz(reg, out_file=dot_data,
> >> feature_names=feature_names,
> >> filled=True, rounded=True,
> >> special_characters=True)
> >> graph = pydot.graph_from_dot
> >>
> >>
> >> This gives me the error message
> >>
> >>
> >> File "/usr/lib/python2.7/dist-packages/pydot.py", line 1802, in
> <lambda>
> >> lambda f=frmt, prog=self.prog : self.create(format=f, prog=prog))
> >> File "/usr/lib/python2.7/dist-packages/pydot.py", line 2023, in
> create
> >> status, stderr_output) )
> >> pydot.InvocationException: Program terminated with status: 1. stderr
> >> follows: Error: not well-formed (invalid token) in line 1
> >> ... <HTML>Design & Tech. 3D Design=A ≤ 0.5 ...
> >> in label of node 17
> >> Error: not well-formed (invalid token) in line 1
> >> ... <HTML>Design & Tech. Product Design=A ≤ 0.5 ...
> >> in label of node 68
> >>
> >>
> >> Is this because there is some restriction on the types of strings that
> >> are supported as feature names?
> >>
> >> Two of the feature names are:
> >>
> >> 'Design & Tech. 3D Design=A'
> >>
> >> and
> >>
> >> 'Design & Tech. Product Design=A'
> >>
> >> Raphael
> >
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