• I have marked all applicable categories:
  • exception-raising bug
  • RL algorithm bug
  • documentation request (i.e. "X is missing from the documentation.")
  • new feature request
• I have visited the source website
• I have searched through the issue tracker for duplicates
• [] I have mentioned version numbers, operating system and environment, where applicable:

  import tianshou, gym, torch, numpy, sys
  print(tianshou.__version__, gym.__version__, torch.__version__, numpy.__version__, sys.version, sys.platform)

Gym 0.25.0 introduced a new step API that returns a tuple of length 5(observation, reward, terminated, truncated, info) instead of 4(observation, reward, done, info).
I think tianshou's setup.py should restrict the gym version to <= 0.24.1 until it supports the new API.