docstr: Checks that the dataset is not prematurely materialized.
docstr_tok: ["Checks","that","the","dataset","is","not","prematurely","materialized","."]
code: def testDeferred(self):
      """Checks that the dataset is not prematurely materialized."""
      kwargs = dict(observed_locs=_small_observed_data)
      func = functools.partial(
          brownian_motion.BrownianMotion,
          observation_noise_scale=0.15,
          innovation_noise_scale=0.1,
      )
      self.validate_deferred_materialization(func, **kwargs)
  
file_path: probability/spinoffs/inference_gym/inference_gym/targets/brownian_motion_test.py
imports: import functools
  import numpy
  import tensorflow.compat.v2
  from tensorflow_probability.python.internal import test_util
  from inference_gym.internal import test_util
  from inference_gym.targets import brownian_motion
label_desc: Use image node_id 4 for calling the BrownianMotionTest obj's underlying member method code with example usage: obj.testDeferred() without return types