torch.utills.save_image modifying the original tensor

[manoja328]

I think it makes sense to just save the tensor as image without modifying it. But looks like it modifies it.

[fmassa]

Thanks for opening the issue!

This seems like a corner case in make_grid which doesn't return a copy, but a view.
I think a solution would be to make a clone in

vision/torchvision/utils.py

Lines 69 to 70 in 6c7189f

	if tensor.size(0) == 1:
	return tensor.squeeze(0)

or, more simply, replace the first mul_ in

vision/torchvision/utils.py

Line 103 in 6c7189f

ndarr = grid.mul_(255).add_(0.5).clamp_(0, 255).permute(1, 2, 0).to('cpu', torch.uint8).numpy()

with mul.

[fmassa]

Fixed via #1244