docstr: Checks that the dataset is not prematurely materialized.
code: def testDeferred(self):
      """Checks that the dataset is not prematurely materialized."""
      self.validate_deferred_materialization(
          stochastic_volatility.StochasticVolatility,
          centered_returns=tf.convert_to_tensor(
              [5.0, -2.1, 8.0, 4.0, 1.1]
          ),
      )
  
file_path: probability/spinoffs/inference_gym/inference_gym/targets/stochastic_volatility_test.py
imports: import tensorflow.compat.v2
  from tensorflow_probability.python.internal import test_util
  from inference_gym.internal import data
  from inference_gym.internal import test_util
  from inference_gym.targets import stochastic_volatility
label_desc: Use image node_id 2 for calling the StochasticVolatilityTest obj's underlying member method code with example usage: obj.testDeferred() without return types