Solved by ptrblck in post #4 
              
              
                If you are using “ImageNet-like” images, you could try to use the calculated stats from the ImageNet dataset as used in our tutorials: 
normalize = transforms.Normalize(mean=[0.485, 0.456, 0.406],
                                 std=[0.229, 0.224, 0.225])

You could of course calculate the mean and…