code: def pair_visual(*args, **kwargs):
    
    warnings.warn("`pair_visual` has moved to `cleverhans.plot.pyplot_image`. "
                  "cleverhans.utils.pair_visual may be removed on or after "
                  "2019-04-24.")
    from cleverhans.plot.pyplot_image import pair_visual as new_pair_visual
    return new_pair_visual(*args, **kwargs)
docs: Deprecation wrapper