code: def load(self, model_dir):
      filepath = Path(model_dir) / SerializationAttributes.MODEL_PKL
      with open(filepath, "rb") as f:
          return pickle.load(f)
  
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 2 for calling the PickleSerializer obj's underlying member method code with example usage: obj.load(model_dir) and returns: pickle