【下载文档:  解决使用export_graphviz可视化树报错的问题.txt 】

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解决使用export_graphviz可视化树报错的问题
在使用可视化树的过程中，报错了。说是‘dot.exe'not found in path
原代码：
# import tools needed for visualization
from sklearn.tree import export_graphviz
import pydot
#Pull out one tree from the forest
tree = rf.estimators_[5]
# Export the image to a dot file
export_graphviz(tree, out_file = 'tree.dot', feature_names = features_list, 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');
报错信息：
解决方法：
先使用安装pydot:
pip install pydot
然后再下载Graphviz（http://www.graphviz.org 选择msi版本）一路安装，记住默认的安装路径
c:\Program Files (x86)\Graphviz2.38\。
将Graphviz2.38添加到环境变量中
import os
os.environ['PATH'] = os.environ['PATH'] + (';c:\\Program Files (x86)\\Graphviz2.38\\bin\\')
之后便可以正常使用了。
修改后代码：
# import tools needed for visualization
from sklearn.tree import export_graphviz
import pydot
import os
os.environ['PATH'] = os.environ['PATH'] + (';c:\\Program Files (x86)\\Graphviz2.38\\bin\\')
#Pull out one tree from the forest
tree = rf.estimators_[5]
# Export the image to a dot file
export_graphviz(tree, out_file = 'tree.dot', feature_names = features_list, 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');
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