0.25.1 Release Notes

• Added rendering for CliffWalking environment @younik

• PixelObservationWrapper only supports the new render API due to difficulty in supporting both old and new APIs. A warning is raised if the user is using the old API @vmoens

Bug fix

• Revert an incorrect edition on wrapper.FrameStack @ZhiqingXiao

• Fix reset bounds for mountain car @psc-g

• Removed skipped tests causing bugs not to be caught @pseudo-rnd-thoughts

• Added backward compatibility for environments without metadata @pseudo-rnd-thoughts

• Fixed BipedalWalker rendering for RGB arrays @1b15

• Fixed bug in PixelObservationWrapper for using the new rendering @younik

Typos

• Rephrase observations’ definition in Lunar Lander Environment @EvanMath

• Top-docstring in gym/spaces/dict.py @Ice1187

• Several typos in humanoidstandup_v4.py, mujoco_env.py, and vector_list_info.py @timgates42

• Typos in passive environment checker @pseudo-rnd-thoughts

• Typos in Swimmer rotations @lin826

Full Changelog: https://github.com/openai/gym/compare/0.25.0…0.25.1

Github Release: https://github.com/openai/gym/releases/tag/0.25.1