runpy.run_path(name)
--
  | File "/opt/miniconda/lib/python3.6/runpy.py", line 263, in run_path
  | pkg_name=pkg_name, script_name=fname)
  | File "/opt/miniconda/lib/python3.6/runpy.py", line 96, in _run_module_code
  | mod_name, mod_spec, pkg_name, script_name)
  | File "/opt/miniconda/lib/python3.6/runpy.py", line 85, in _run_code
  | exec(code, run_globals)
  | File "/tmp/tmpa7hc7kq2", line 39, in <module>
  | import ray.rllib.agents.ppo as ppo
  | File "/ray/python/ray/rllib/__init__.py", line 58, in <module>
  | _register_all()
  | File "/ray/python/ray/rllib/__init__.py", line 39, in _register_all
  | register_trainable(key, get_trainer_class(key))
  | File "/ray/python/ray/rllib/agents/registry.py", line 220, in get_trainer_class
  | return _get_trainer_class(alg, return_config=return_config)
  | File "/ray/python/ray/rllib/agents/registry.py", line 238, in _get_trainer_class
  | class_, config = ALGORITHMS[alg]()
  | File "/ray/python/ray/rllib/agents/registry.py", line 22, in _import_alpha_star
  | from ray.rllib.agents import alpha_star
  | File "/ray/python/ray/rllib/agents/alpha_star/__init__.py", line 1, in <module>
  | from ray.rllib.agents.alpha_star.alpha_star import DEFAULT_CONFIG, AlphaStarTrainer
  | File "/ray/python/ray/rllib/agents/alpha_star/alpha_star.py", line 14, in <module>
  | import ray.rllib.agents.ppo.appo as appo
  | AttributeError: module 'ray' has no attribute 'rllib'