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：
pip install pydot
然后再下载Graphviz（http://www.graphviz.org）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');