code: def convert_model_to_external_data(model, all_tensors_to_one_file=True, location=None):
      # type: (ModelProto, bool, Optional[Text]) -> None
      
      if all_tensors_to_one_file:
          file_name = Text(uuid.uuid1())
          if location:
              file_name = location
          for tensor in _get_all_tensors(model):
              set_external_data(tensor, file_name)
      else:
          for tensor in _get_all_tensors(model):
              set_external_data(tensor, tensor.name)
docs: call to set all tensors as external data. save_model saves all the tensors data as external data after calling this function.
      @params
      model: ModelProto to be converted.
      all_tensors_to_one_file: If true, save all tensors to one external file specified by location.
                               If false, save each tensor to a file named with the tensor name.
      location: specify the external file that all tensors to save to.
                If not specified, will use the model name.