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 visualizationfrom sklearn.tree import export_graphvizimport pydot #Pull out one tree from the foresttree = rf.estimators_[5] # Export the image to a dot fileexport_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 filegraph.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 osos.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 visualizationfrom sklearn.tree import export_graphvizimport pydotimport os os.environ['PATH'] = os.environ['PATH'] + (';c:\\Program Files (x86)\\Graphviz2.38\\bin\\') #Pull out one tree from the foresttree = rf.estimators_[5] # Export the image to a dot fileexport_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 filegraph.write_png('tree.png');

以上这篇解决使用export_graphviz可视化树报错的问题就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。