Deprecations and breaking changes:

• CompilerEnv.step no longer accepts a list of actions (#627). A new method, CompilerEnv.multistep provides this functionality. This is to provide compatibility with environments whose action spaces are lists. To update your code, replace any calls to env.step() which take a list of actions to use env.multistep(). Thanks @sogartar!
• The arguments observations and rewards to step() have been renamed observation_spaces and reward_spaces, respectively (#627).
• Reward.id has been renamed Reward.name (#565, #612). Thanks @parthchadha!

• The backend protocol buffer schema has been updated to natively support more types of observation and action, and to support nested spaces (#531). Thanks @sogartar!

Full Changelog: https://github.com/facebookresearch/CompilerGym/compare/v0.2.2...v0.2.3