Remove unnecessary input image padding #139
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If an image's height/width already is a multiple of the window size, then we don't have to pad the input image. E.g., for an image of shape 256x512 and using window size of 8x8 the previous code would pad in both height and width by a full window in both dimensions (i.e., 8 pixels in height and 8 pixels in width), even though this is unnecessary. This is now removed, and for the given example the padding would be 0 in both dimensions.