code: def test_data_initiation(public_data_object, private_data_object):
      assert isinstance(
          public_data_object,
          dice_ml.data_interfaces.public_data_interface.PublicData,
      ), "the given parameters should instantiate PublicData class"
  
      assert isinstance(
          private_data_object,
          dice_ml.data_interfaces.private_data_interface.PrivateData,
      ), "the given parameters should instantiate PrivateData class"
  
file_path: DiCE/tests/test_data.py
imports: import pytest
  import dice_ml
label_desc: Use image node_id 1 for calling a global function with example usage: test_data_initiation(public_data_object, private_data_object) without return types