Inplace Dropout causes "RuntimeError: one of the variables needed for gradient computation has been modified by an inplace operation: [torch.cuda.HalfTensor [256, 256, 11, 11]], which is output 0 of ReluBackward0, is at version 2;expected version 1instead

vision
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The error is not an annoyance and is rightfully raised since you are using disallowed inplace operations, which would otherwise create invalid gradients.
@KFrank gives a few great examples as e.g. in this post.