• 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 environment API supports seed, return_info, and options in reset:

https://github.com/openai/gym/blob/dcae553204957a75db5e4169e33547ccac599609/gym/core.py#L93

But I find the information lost in tianshou:

Also the return type is Union[ObsType, tuple[ObsType, dict]] in gym, but only ObsType in tianshou.