1.12.0

• API changes
  • new observation_space(agent), action_space(agent) methods that retreive the static space for an agent
  • possible_agents, observation_spaces, action_spaces attributes made optional. Wrappers pass these attributes through if they exist.
  • parallel environment's agents list contains agents to take next step, instead of agents that took previous step.
  • Generated agents now allowed, agents can be created any time during an episode. Note that agents cannot resurect, once they are done, they cannot be readded to the environment.
• Fixed unexpected behavior with close method in pursuit environment
• Removed pygame loading messages
• Fix pillow dependency issue
• Removed local ratio arg from pistonball environment
• Gym 0.21.0 support
• Better code formatting (isort, etc.)