CI jobs failing with No module named 'pygame'

[daniellepintz]

Multiple CI jobs are failing with this error:

UNEXPECTED EXCEPTION: ModuleNotFoundError("No module named 'pygame'")
Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/doctest.py", line 1337, in __run
    compileflags, 1), test.globs)
  File "<doctest pl_examples.domain_templates.reinforce_learn_Qnet.DQNLightning[0]>", line 1, in <module>
  File "/home/runner/work/pytorch-lightning/pytorch-lightning/pl_examples/domain_templates/reinforce_learn_Qnet.py", line 256, in __init__
    self.env = gym.make(env)
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/site-packages/gym/envs/registration.py", line 676, in make
    return registry.make(id, **kwargs)
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/site-packages/gym/envs/registration.py", line 520, in make
    return spec.make(**kwargs)
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/site-packages/gym/envs/registration.py", line 139, in make
    cls = load(self.entry_point)
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/site-packages/gym/envs/registration.py", line 55, in load
    mod = importlib.import_module(mod_name)
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line [72](https://github.com/PyTorchLightning/pytorch-lightning/runs/5252696654?check_suite_focus=true#step:17:72)8, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/site-packages/gym/envs/classic_control/__init__.py", line 1, in <module>
    from gym.envs.classic_control.cartpole import CartPoleEnv
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/site-packages/gym/envs/classic_control/cartpole.py", line 10, in <module>
    import pygame
ModuleNotFoundError: No module named 'pygame'
/home/runner/work/pytorch-lightning/pytorch-lightning/pl_examples/domain_templates/reinforce_learn_Qnet.py:218: UnexpectedException

Example job: https://github.com/PyTorchLightning/pytorch-lightning/runs/5252696654?check_suite_focus=true

The failing jobs are all using "latest" rather than "oldest" - what is this referring to?

cc @carmocca @akihironitta @Borda

[carmocca]

"latest" rather than "oldest" - what is this referring to?

Latest means using the latest versions of our dependencies. Oldest, the oldest versions.
https://github.com/PyTorchLightning/pytorch-lightning/blob/master/.github/set-min-requirements.py

ModuleNotFoundError: No module named 'pygame'

This is most likely caused by the release of gym==0.22.0 2 days ago: https://github.com/openai/gym/releases/tag/0.22.0

We can unblock by setting gym>=0.17.0,<0.22.0 here https://github.com/PyTorchLightning/pytorch-lightning/blob/master/requirements/examples.txt#L2

@jkterry1 (author of the release). Is this a known change or issue? Thank you!

[jkterry1]

Hey, the release just requires using pip install gym[toy_text] for those environments now is all. Every set of environments in gym used to require this but toy_text, and 0.22.0 added a dependency for toy_text for the first time so now it has to be used then too (we added conscionable rendering with pygame since these are used heavily in education and so on: https://www.gymlibrary.ml/pages/environments/toy_text/).