Missing attribute 'RAND_LIMIT' in modules Box2D

[ghost]

The following traceback is produced when running examples/tf/trpo_cartpole.py:

  File "examples/tf/trpo_cartpole.py", line 3, in <module>
    from garage.envs.box2d import CartpoleEnv
  File "/home/aigonzal/ivanWorkspace/garage/garage/envs/box2d/__init__.py", line 1, in <module>
    from garage.envs.box2d.box2d_env import Box2DEnv
  File "/home/aigonzal/ivanWorkspace/garage/garage/envs/box2d/box2d_env.py", line 9, in <module>
    from garage.envs.box2d.box2d_viewer import Box2DViewer
  File "/home/aigonzal/ivanWorkspace/garage/garage/envs/box2d/box2d_viewer.py", line 1, in <module>
    from Box2D import b2ContactListener
  File "/home/aigonzal/anaconda2/envs/garage/lib/python3.6/site-packages/Box2D/__init__.py", line 20, in <module>
    from .Box2D import *
  File "/home/aigonzal/anaconda2/envs/garage/lib/python3.6/site-packages/Box2D/Box2D.py", line 434, in <module>
    RAND_LIMIT = _Box2D.RAND_LIMIT

It seems the problem is solved by running:
pip install box2d-py

[ryanjulian]

This is documented in dockerfile/Dockerfile.ci.

The solution is:

conda activate garage
pip uninstall -y Box2D Box2D-kengz box2d-py
pip install Box2D

See openai/gym#100 and pybox2d/pybox2d#82

[ghost]

Yes, I just noticed with grep -n -r "box2d-py" in garage.

[ryanjulian]

We should probably keep this open until gym/box2d fix the upstream bug.

[ghost]

Okay, in the meantime, the patch has been implemented in #258

[ryanjulian]

ref #319

[naeioi]

This issue is fixed in #335 . Closed.