error message

THCudaCheck FAIL file=..\torch/csrc/THCudaChgeneck FAeric/StoragITHL Cuefile=Sha.da.\rCinhtoregcch.k cpp /csrcline=24F/gAI9 errL file=oe..\tor=nr801 : eoric/Stopch/ceration not susrcpporte/gend
eric/StorageSharing.cpp rageSharing.cpp line=249 error=801 : operation not supported
line=249 error=801 : operation not supported
Traceback (most recent call last):
Traceback (most recent call last):
  File "D:\Miniconda3\envs\dl\lib\multiprocessing\queues.py", line 236, in _feed
    obj = _ForkingPickler.dumps(obj)
  File "D:\Miniconda3\envs\dl\lib\multiprocessing\reduction.py", line 51, in dumps
    cls(buf, protocol).dump(obj)
  File "D:\Miniconda3\envs\dl\lib\multiprocessing\queues.py", line 236, in _feed
    obj = _ForkingPickler.dumps(obj)
  File "D:\Miniconda3\envs\dl\lib\site-packages\torch\multiprocessing\reductions.py", line 247, in reduce_tensor
    event_sync_required) = storage._share_cuda_()
  File "D:\Miniconda3\envs\dl\lib\multiprocessing\reduction.py", line 51, in dumps
    cls(buf, protocol).dump(obj)
Traceback (most recent call last):
  File "D:\Miniconda3\envs\dl\lib\site-packages\torch\multiprocessing\reductions.py", line 247, in reduce_tensor
    event_sync_required) = storage._share_cuda_()
RuntimeError: cuda runtime error (801) : operation not supported at ..\torch/csrc/generic/StorageSharing.cpp:249
RuntimeError: cuda runtime error (801) : operation not supported at ..\torch/csrc/generic/StorageSharing.cpp:249

reason

https://github.com/fastai/fastbook/issues/85

Since pytorch multiprocessing does not work on windows, set the num of dataloaders_ workers=0