graphviz.backend.ExecutableNotFound: failed to execute ‘dot‘, make sure the Graphviz executables are

如果直接pip install torchziv，会直接将graphviz，torchziv两个都安装好，但是这种方法无法将graphviz导入系统路径。从网址Download | Graphviz 下载zip，解压后复制到python路径下即可。