'Args:
perturb_ratio (float): perturb distance will be in
``[0, perturb_ratio * sqrt(w * h)]``
max_aspect_ratio_diff (float): keep aspect ratio difference within the range'

def __init__(self, perturb_ratio, max_aspect_ratio_diff=0.3):

    super(RandomCropAroundBox, self).__init__()
    self._init(locals())
