code: def _test_dataset():
      return dict(
          observed_locs=_fake_observed_data,
          innovation_noise_scale=0.1,
          observation_noise_scale=0.15,
      )
  
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 1 for calling a global function with example usage: _test_dataset() and returns: dict