code: def _train(
      self,
      train_data,
      val_data,
      test_data,
      writer,
      experiment,
      dry_run: bool = False,
  ) -> None:
      self.model = "a cool model"
  
file_path: traintool/tests/test_model_wrapper.py
imports: from fastapi.testclient import TestClient
  import numpy
  from traintool.model_wrapper import ModelWrapper
label_desc: Use image node_id 1 for calling the DummyWrapper obj's underlying member method code with example usage: obj._train(train_data, val_data, test_data, writer, experiment, dry_run) without return types