Torch.bmm will break the gradient?RuntimeError: one of the variables needed for gradient computation has been modified by an inplace operation

1

Hi, all
My code like this:
output=torch.bmm(l_atten.unsqueeze(1),l_feature)
return output
where l_atten is obtained from l_feature according to a NNs
So both l_feature and l_atten need backward.

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