解决RuntimeError: Distributed package doesn‘t have NCCL built in

Posted 2022-12-08 Paul-Huang

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现象

python在windows环境下dist.init_process_group(backend, rank, world_size)处报错‘RuntimeError: Distributed package doesn’t have NCCL built in’

windows不支持NCCL backend

import sys

if sys.platform == "win32":
     os.environ["PL_TORCH_DISTRIBUTED_BACKEND"] = "gloo"

import os

os.environ["PL_TORCH_DISTRIBUTED_BACKEND"] = "gloo"

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