KernelGAN
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It seems like a bug?
https://github.com/sefibk/KernelGAN/blob/7218a37f0933519513aac97f40b8a72d3676eec9/imresize.py#L164
If we want to get the size of last dimension(the number of channels), we should use im.shape[-1], np.ndim(im) is the number of dimension of im, in RGB case just equal to im.shape[-1], but for gray image that is wrong.