[Bug] opencv-python vs opencv-python-headless dependency issue

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🐛 Bug

Currently you have your setup.py file configured to install opencv-python. However, in your docker file you then uninstall opencv-python and install opencv-python-headless. I assume this is because you get a segmentation fault in the docker container unless you do this step.

I have a repo with stable-baselines3 as a dependency. I had my tests working locally (macOS), but got a segmentation fault in CI (ubuntu).

I use Poetry, so I have resolved the issue using environment markers in my dependency configuration.

` stable-baselines3 = “0.10.0”

atari_py = {version = “~0.2”}

opencv-python-headless = {version = “~4.5”, markers = “sys_platform == ‘linux’”}

opencv-python = {version = “~4.5”, markers = “sys_platform == ‘darwin’”} `

If you used poetry you could take a similar approach, which would be cleaner than your current solution, I think.

To Reproduce

Install stable-baselines3[extra] in ubuntu and then run the following:

from stable_baselines3 import ...

Current thread 0x00007f0eee355740 (most recent call first):
  File "/usr/local/lib/python3.7/ctypes/__init__.py", line 364 in __init__
  File "/usr/local/lib/python3.7/site-packages/torch/__init__.py", line 142 in _load_global_deps
  File "/usr/local/lib/python3.7/site-packages/torch/__init__.py", line 189 in <module>
  File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 728 in exec_module
  File "<frozen importlib._bootstrap>", line 677 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 967 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 983 in _find_and_load
  File "/usr/local/lib/python3.7/site-packages/stable_baselines3/a2c/a2c.py", line 3 in <module>
  File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 728 in exec_module
  File "<frozen importlib._bootstrap>", line 677 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 967 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 983 in _find_and_load
  File "/usr/local/lib/python3.7/site-packages/stable_baselines3/a2c/__init__.py", line 1 in <module>
  File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 728 in exec_module
  File "<frozen importlib._bootstrap>", line 677 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 967 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 983 in _find_and_load
  File "/usr/local/lib/python3.7/site-packages/stable_baselines3/__init__.py", line 3 in <module>
  File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 728 in exec_module
  File "<frozen importlib._bootstrap>", line 677 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 967 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 983 in _find_and_load
  File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 953 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 983 in _find_and_load
  File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 953 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 983 in _find_and_load
  File "/build/offpolicydqn/envs/crmsubscriber/env.py", line 19 in <module>
  File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 728 in exec_module
  File "<frozen importlib._bootstrap>", line 677 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 967 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 983 in _find_and_load
  File "/Users/thomas.furmston/farfetch/code/marketplace-marketing-offpolicydqn/tests/offpolicydqn/envs/crmsubscriber/test_env.py", line 7 in <module>
  File "/usr/local/lib/python3.7/site-packages/_pytest/assertion/rewrite.py", line 152 in exec_module
  File "<frozen importlib._bootstrap>", line 677 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 967 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 983 in _find_and_load
  File "/usr/local/lib/python3.7/site-packages/py/_path/local.py", line 704 in pyimport
  File "/usr/local/lib/python3.7/site-packages/_pytest/python.py", line 511 in _importtestmodule
  File "/usr/local/lib/python3.7/site-packages/_pytest/python.py", line 443 in _getobj
  File "/usr/local/lib/python3.7/site-packages/_pytest/python.py", line 261 in obj
  File "/usr/local/lib/python3.7/site-packages/_pytest/python.py", line 459 in _inject_setup_module_fixture
  File "/usr/local/lib/python3.7/site-packages/_pytest/python.py", line 446 in collect
  File "/usr/local/lib/python3.7/site-packages/_pytest/runner.py", line 264 in <lambda>
  File "/usr/local/lib/python3.7/site-packages/_pytest/runner.py", line 244 in from_call
  File "/usr/local/lib/python3.7/site-packages/_pytest/runner.py", line 264 in pytest_make_collect_report
  File "/usr/local/lib/python3.7/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/usr/local/lib/python3.7/site-packages/pluggy/manager.py", line 87 in <lambda>
  File "/usr/local/lib/python3.7/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/usr/local/lib/python3.7/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/usr/local/lib/python3.7/site-packages/_pytest/runner.py", line 382 in collect_one_node
  File "/usr/local/lib/python3.7/site-packages/_pytest/main.py", line 681 in genitems
  File "/usr/local/lib/python3.7/site-packages/_pytest/main.py", line 684 in genitems
  File "/usr/local/lib/python3.7/site-packages/_pytest/main.py", line 490 in _perform_collect
  File "/usr/local/lib/python3.7/site-packages/_pytest/main.py", line 452 in perform_collect
  File "/usr/local/lib/python3.7/site-packages/_pytest/main.py", line 257 in pytest_collection
  File "/usr/local/lib/python3.7/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/usr/local/lib/python3.7/site-packages/pluggy/manager.py", line 87 in <lambda>
  File "/usr/local/lib/python3.7/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/usr/local/lib/python3.7/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/usr/local/lib/python3.7/site-packages/_pytest/main.py", line 246 in _main
  File "/usr/local/lib/python3.7/site-packages/_pytest/main.py", line 191 in wrap_session
  File "/usr/local/lib/python3.7/site-packages/_pytest/main.py", line 240 in pytest_cmdline_main
  File "/usr/local/lib/python3.7/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/usr/local/lib/python3.7/site-packages/pluggy/manager.py", line 87 in <lambda>
  File "/usr/local/lib/python3.7/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/usr/local/lib/python3.7/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/usr/local/lib/python3.7/site-packages/_pytest/config/__init__.py", line 125 in main
  File "/usr/local/bin/pytest", line 8 in <module>
Segmentation fault

Expected behavior

No segmentation fault.

### System Info

Describe the characteristic of your environment:

• Describe how the library was installed (pip, docker, source, …) - pip
• GPU models and configuration - cpu
• Python version - 3.7
• PyTorch version - 1.7
• Gym version - 1.7
• Versions of any other relevant libraries

Additional context

Add any other context about the problem here.

Checklist

• [ x ] I have checked that there is no similar issue in the repo (required)
• [ x ] I have read the documentation (required)
• [ x ] I have provided a minimal working example to reproduce the bug (required)

[tfurmston]

OK, cool.

Yes, it is a bit niche, I suppose. 😃

I’ll submit a PR for the documentation.

[araffin]

I was suggesting this could be improved, or atleast more clearly documented.

As it is quite a specific problem. I would rather document it, we already have that [extra] option and I don’t think we need to add an option that may not be used that often. I would be happy if you could submit a PR to update the documentation =) (I’m not sure what is the best section: probably “installation” or “developer guide”)