code: def save_model(
      MainModel, network_filepath, weight_filepath, dump_filepath
  ):
      model = MainModel.RefactorModel()
      model = MainModel.deploy_weight(model, weight_filepath)
      model.save_checkpoint(dump_filepath, 0)
      print(
          "MXNet checkpoint file is saved with prefix [{}] and iteration 0, generated by [{}.py] and [{}].".format(
              dump_filepath, network_filepath, weight_filepath
          )
      )
  
label_desc: Use image node_id 1 for calling a global function with example usage: save_model(MainModel, network_filepath, weight_filepath, dump_filepath) without return types