code: def _check_model_name_pairs(self, model_name_pairs):
      if not isinstance(model_name_pairs, list):
          return []
      elif isinstance(model_name_pairs[0], list) and isinstance(
          model_name_pairs[0][0], str
      ):
          return model_name_pairs
      else:
          return [model_name_pairs]
  
imports: import paddle
  import paddle.nn.functional
label_desc: Use image node_id 2 for calling the DMLLoss obj's underlying member method code with example usage: obj._check_model_name_pairs(model_name_pairs) and returns: list, model_name_pairs, list