def _scale_bbox_only_op_probability(prob):
    """Reduce the probability of the bbox-only operation.

  Probability is reduced so that we do not distort the content of too many
  bounding boxes that are close to each other. The value of 3.0 was a chosen
  hyper parameter when designing the autoaugment algorithm that we found
  empirically to work well.

  Args:
    prob: Float that is the probability of applying the bbox-only operation.

  Returns:
    Reduced probability.
  """
    return prob / 3.0
