code: def test_mlflow_callback(self) -> None:
      m = _get_m(callback_names="mlflow")
      callbacks = [
          c.__identifier__ for c in m.build_trainer.trainer.callbacks
      ]
      self.assertTrue("mlflow" in callbacks)
  
file_path: carefree-learn/tests/test_protocol.py
imports: import torch
  import cflearn
  import unittest
  from typing import Any
  from cflearn.schema import ILoss
  from cflearn.pipeline import MLTrainingPipeline
label_desc: Use image node_id 1 for calling the TestProtocol obj's underlying member method code with example usage: obj.test_mlflow_callback() without return types