code: def test_tf(self):
      tf = pytest.importorskip("tensorflow")
      backend = "TF" + tf.__version__[0]
      exp = self._get_exp(backend, method="gradient")
      assert issubclass(
          type(exp),
          dice_ml.explainer_interfaces.explainer_base.ExplainerBase,
      )
      assert isinstance(
          exp,
          dice_ml.explainer_interfaces.dice_tensorflow2.DiceTensorFlow2,
      ) or isinstance(
          exp,
          dice_ml.explainer_interfaces.dice_tensorflow1.DiceTensorFlow1,
      )
  
file_path: DiCE/tests/test_dice.py
imports: import pytest
  from raiutils.exceptions import UserConfigValidationException
  import dice_ml
  from dice_ml.utils import helpers
label_desc: Use image node_id 2 for calling the TestBaseExplainerLoader obj's underlying member method code with example usage: obj.test_tf() without return types