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fixes for torch version larger than 2.1.0 #3247

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fixes for torch version larger than 2.1.0 #3247

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7 changes: 5 additions & 2 deletions mmcv/parallel/_functions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@
import torch
from torch import Tensor
from torch.nn.parallel._functions import _get_stream

from packaging import version

def scatter(input: Union[List, Tensor],
devices: List,
Expand Down Expand Up @@ -72,7 +72,10 @@ def forward(target_gpus: List[int], input: Union[List, Tensor]) -> tuple:
streams = None
if input_device == -1 and target_gpus != [-1]:
# Perform CPU to GPU copies in a background stream
streams = [_get_stream(device) for device in target_gpus]
if version.parse(torch.__version__) >= version.parse('2.1.0'):
streams = [_get_stream(torch.device("cuda", device)) for device in target_gpus]
else:
streams = [_get_stream(device) for device in target_gpus]

outputs = scatter(input, target_gpus, streams)
# Synchronize with the copy stream
Expand Down
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