1 去这里下载nccl库

https://developer.download.nvidia.cn/compute/machine-learning/repos/ubuntu1804/x86_64/

2  执行

sudo dpkg -i libnccl2_2.7.3-1+cuda10.2_amd64.deb
sudo dpkg -i libnccl-dev_2.7.3-1+cuda10.2_amd64

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