使用keras的utils的 plot_model功能报错，即使安装了pydot也无济于事。
`pydot` failed to call GraphViz.Please install GraphViz (https://www.graphviz.org/) and ensure that its executables are in the $PATH.
1，安装Graphviz软件
https://graphviz.gitlab.io/_pages/Download/Download_windows.html
下载smi文件一路next安装即可
2，配置Graphviz软件环境变量
3，找到pydot源码
4，修改源码如下