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It can be enabled by calling torchvision.set_image_backend('accimage')

* fix for to_tensor when input is np.ndarray of shape [H,W,C]. Issue #48 pytorch/vision

* update cifar datasets to transpose images from CHW -> HWC

* fix flake8 issue on test_transforms.py

    git ls-files | grep '\.py$' | xargs -n1 -P`nproc` autopep8 -i

tgz_mdf should be changed to tgz_md5 to make it work