code: def test_get_model_existing_models(self, model_name, expected_class):
      self.assertIsInstance(
          modeling.get_model(model_name), expected_class
      )
  
imports: from absl.testing import absltest
  from absl.testing import parameterized
  import numpy
  import tensorflow
  import tf_slim
  from deepvariant import dv_constants
  from deepvariant import dv_utils_using_clif
  from deepvariant import modeling
label_desc: Use image node_id 1 for calling the ModelingTest obj's underlying member method code with example usage: obj.test_get_model_existing_models(model_name, expected_class) without return types