def image_aspect_ratio(self, image_index):
    '\n        Compute the aspect ratio for an image with image_index.\n        '
    raise NotImplementedError('image_aspect_ratio method not implemented')
Compute the aspect ratio for an image with image_index.
def image_aspect_ratio(self, image_index):
    '\n        \n        '
    raise NotImplementedError('image_aspect_ratio method not implemented')