code: def observation_spec(self):
      return tensor_spec.TensorSpec(
          shape=[3], dtype=tf.float32, name="observation_spec"
      )
  
file_path: agents/tf_agents/bandits/environments/non_stationary_stochastic_environment_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import tensorflow
  import tensorflow_probability
  from tf_agents.bandits.environments import non_stationary_stochastic_environment
  from tf_agents.specs import tensor_spec
label_desc: Use image node_id 2 for calling the DummyDynamics obj's underlying member method code with example usage: obj.observation_spec() and returns: tensor_spec