多机多卡训练mmseg工程时，命令
第一台机器：

NnodeS=2 NODE_RANK=0 PORT=8888 MASTER_ADDR=192.168.XX.XX sh tools/dist_train.sh ./configs/temp.py 4

第二台机器：

NNODES=2 NODE_RANK=1 PORT=8888 MASTER_ADDR=192.168.XX.XX sh tools/dist_train.sh ./configs/temp.py 4

报错信息如下：

RuntimeError: The server Socket has failed to listen on any local network address. The server socket has failed to bind to [::]:8888 (errno: 98 - Address already in use). The server socket has failed to bind to ?UNKNOWN? (errno: 98 - Address already in use).

根据报错信息，可以看到是因为8888这个端口号被使用了 ，此时只需要更换PORT的端口号就可以了，比如改成29050，29051......

至此，问题解决！

整理不易，欢迎一键三连！！！

来源地址：https://blog.csdn.net/qq_38308388/article/details/128724358