Not able to print Random Forest Regressor tree

Question

I looked at several examples and followed them but not able to print tree graphs.

R_forest = RandomForestRegressor(bootstrap=False,
  max_depth=30,
  max_features ='sqrt',
  min_samples_leaf= 4,
  min_samples_split=2,
  n_estimators = 600)
model=R_forest.fit(X_train,y_train)

from sklearn.datasets import *
from sklearn import tree
from sklearn.tree import export_graphviz
import graphviz
import pydot


tree = R_forest.estimators_[5]
# Export the image to a dot file
export_graphviz(tree, out_file = 'tree.dot', feature_names = X_train.columns, 
rounded = True, precision = 1)
# Use dot file to create a graph
(graph, ) = pydot.graph_from_dot_file('tree.dot')
# Write graph to a png file
graph.write_png('tree.png')

I get this error:

FileNotFoundError: [WinError 2] "dot.exe" not found in path.

I followed this solution but still getting same error.

"RuntimeError: Make sure the Graphviz executables are on your system's path" after installing Graphviz 2.38

Screenshot of my system.

Any help or advise appreciated

Which line of the code is giving you the error? Are you able to generate the 'tree.dot' file? — willk, Jun 22 '18 at 17:08
Yes I am able to generate 'tree.dot' file. Thank you for your answer I will confirm as correct answer. — Murtaza Haji, Jun 22 '18 at 18:12

score 1 · Accepted Answer · answered Jun 22 '18 at 17:19

If you are able to generate the "tree.dot" file, then you can run the following from the command line (in the directory with "tree.dot") to convert to a png :

dot -Tpng tree.dot -o tree.png

If this doesn't work, you can also try using the full path to dot.exe:

path\to\dot.exe -Tpng tree.dot -o tree.png

Running from Python using graph.write_png('tree.png') doesn't work on my Windows machine, but the command line operation does.

Solution from another StackOverflow answer.

Not able to print Random Forest Regressor tree

1 Answers1