MAC出现pydotplus.graphviz.InvocationException: GraphViz's executables not found 错误

from sklearn.externals.six import StringIO
dot_data1 = StringIO()
tree.export_graphviz(clf2, out_file=dot_data1)
graph1 = pydotplus.graph_from_dot_data(dot_data1.getvalue())
graph1.write_pdf("tree1.pdf")

运行时出现pydotplus.graphviz.InvocationException: GraphViz's executables not found 错误

用brew命令安装graphviz，过程中会自动安装graphviz的依赖包：

如果未安装brew，会提示错误brew command not found，查看解决办法：mac安装brew（brew command not found错误解决方法）

brew install graphviz

（如果之前已经安装过，可用brew reinstall graphviz命令重新安装）

过程中会安装依赖包：Installing dependencies for graphviz: libpng, freetype, fontconfig, jpeg, libtiff, webp, gd and libtool

 

成功安装后，则可使用以下命令绘制决策树的可视化图：

import pydotplus
dot_data1 = tree.export_graphviz(clf2, out_file=None)
graph1 = pydotplus.graph_from_dot_data(dot_data1)
graph1.write_pdf("tree1.pdf")

 

参考：https://blog.csdn.net/coder_Gray/article/details/81632003