https://github.com/pytorch/vision/blob/3990952f76df3d553dfb54a9600eafc44899e2bf/torchvision/transforms/transforms.py#L156 see https://github.com/pytorch/vision/blob/c5e52baa632878e2989d62d5888179f900b01c8b/torchvision/transforms.py#L165