docs: def get_variant_label(v_conf):
      """
      Generates name for variant images based settings (by variants sizes).
      """
      if v_conf['MAX_SIZE'][0] is None:
          return 'h{}'.format(v_conf['MAX_SIZE'][1])
      if v_conf['MAX_SIZE'][1] is None:
          return 'w{}'.format(v_conf['MAX_SIZE'][0])
      return '{}x{}'.format(*v_conf['MAX_SIZE'])