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1.问题报错
rank.proto: A file with this name is already in the pool.
[E 210422 14:48:32 flask_server:87] grpc请求执行失败，详细信息：Couldn't build proto file into descriptor pool!
Invalid proto descriptor for file "rank.proto":
rank.proto: A file with this name is already in the pool.
2.解决方法
（1） 查看当前protobuf版本，假设为3.12.2
pip3 show protobuf
（2）卸载该版本
pip uninstall protobuf
（3）采用如下方式，重新安装对应的版本
pip install --no-binary protobuf protobuf==3.12.2
参考：https://github.com/protocolbuffers/protobuf/issues/3002 | 
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