code: def save_model(
      MainModel, network_filepath, weight_filepath, dump_filepath
  ):
      model = MainModel.KitModel(weight_filepath)
      model.save(dump_filepath)
      print(
          "CNTK model file is saved as [{}], 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