Graphviz.Source not rendering in Jupyter Notebook

问题

After exporting a .dot file using scikit-learn's handy export_graphviz function.

I am trying to render the dot file using Graphviz into a cell in my Jupyter Notebook:

import graphviz
from IPython.display import display

with open("tree_1.dot") as f:
    dot_graph = f.read()
display(graphviz.Source(dot_graph))

However the out[ ] is just an empty cell.

I am using graphviz 0.5 (pip then conda installed), iPython 5.1, and Python 3.5 The dot file looks correct here are the first characters:

digraph Tree {\nnode [shape=box, style="filled", color=

iPython display seems to work for other objects including Matplotlib plots and Pandas dataframes.

I should note the example on Graphviz' site also doesn't work.

回答1:

It's possible that since you posted this, changes were made so you might want to update your libraries if that's possible.

The versions of relevance here I used are:

Python 2.7.10

IPython 5.1.0

graphviz 0.7.1

If you have a well formed .dot file, you can display it to the jupyter out[.] cell by the following:

import graphviz

with open("tree_1.dot") as f:
    dot_graph = f.read()

# remove the display(...)

graphviz.Source(dot_graph)

回答2:

graphviz.Source(dot_graph).view()

回答3:

Try to use pydotplus.

import pydotplus

by (1.1) Importing the .dot from outside

pydot_graph = pydotplus.graph_from_dot_file("clf.dot")

or (1.2) Directly using the .export_graphviz output

dt = tree.DecisionTreeClassifier()
dt = clf.fit(x,y)
dt_graphviz = tree.export_graphviz(dt, out_file = None)

pydot_graph = pydotplus.graph_from_dot_data(dt_graphviz)

(2.) and than display the pyplot graph using

from IPython.display import Image

Image(pydot_graph.create_png())

回答4:

try to reinstall graphviz

conda remove graphviz
conda install python-graphviz
graphviz.Source(dot_graph).view()

来源：https://stackoverflow.com/questions/40295024/graphviz-source-not-rendering-in-jupyter-notebook