code: def test_roundtrip_pickle_serializer(self, tmpdir):
      model_dir = tmpdir.mkdir("model_dir")
      serializer = PickleSerializer()
  
      model = None
      serializer.save(model, model_dir)
      deserialized_model = serializer.load(model_dir)
  
      assert deserialized_model == model
  
file_path: responsible-ai-toolbox/responsibleai/tests/test_model_serializer.py
imports: import pickle
  from pathlib import Path
  from rai_test_utils.datasets.tabular import create_cancer_data
  from rai_test_utils.models.lightgbm import create_lightgbm_classifier
  from responsibleai import RAIInsights
  from responsibleai._internal.constants import SerializationAttributes
label_desc: Use image node_id 1 for calling the TestModelSerializer obj's underlying member method code with example usage: obj.test_roundtrip_pickle_serializer(tmpdir) without return types