class_docstr: Base dummy environment.
  
  Args:
      random (bool): If observations are randomly generated or not.
      obs_dim (iterable): Observation space dimension.
      action_dim (iterable): Action space dimension.
docstr: Return an observation space.
code: def observation_space(self):
      """Return an observation space."""
      raise NotImplementedError
  
file_path: garage/tests/fixtures/envs/dummy/base.py
imports: import gym
label_desc: Use image node_id 2 for calling the DummyEnv obj's underlying member method code with example usage: obj.observation_space() without return types