one of the variables needed for gradient computation has been modified by an inplace operation

[sorrowyn]

one of the variables needed for gradient computation has been modified by an inplace operation: [torch.cuda.FloatTensor [36, 3, 128, 128]], which is output 0 of torch::autograd::CopySlices, is at version 9; expected version 6 instead. Hint: enable anomaly detection to find the operation that failed to compute its gradient, with torch.autograd.set_detect_anomaly(True).