Win10+PyTorch+DataParallel got warning:"PyTorch is not compiled with NCCL support"

I’m using PyTorch under Win10, and when apply DataParallel to models, the following warning appears:

  • C:\Anaconda3\lib\site-packages\torch\cuda\nccl.py:27: UserWarning: PyTorch is not compiled with NCCL support
    warnings.warn(‘PyTorch is not compiled with NCCL support’)
  1. Is it because my pytorch was installed under Win10?
  2. Does it slow down the program?

The cause is that Win10 have no NCCL support.