Add support for MultiBinary and MultiDiscrete

[jonashen]

No description provided.

[ryanjulian]

I can't find a single gym.Env which uses these, so it's not a high priority. I think we should include them eventually for the same of completeness.

[jonashen]

It's probably a WIP for them.

[ryanjulian]

@krzentner this is an akro bug

[sud0nick]

@jonashen @ryanjulian These are still not used in any gym.Env but they are used in gym/utils.py and support exists in dict.py. Is this something that still needs to be added to akro or has it dropped off the radar?

[ryanjulian]

Sorry for the slow response.

I think this is still desirable for coverage reasons, even though it's not used anywhere in gym. I don't think it's very high-priority.

Our ambition for this library is "gym.Spaces, but with all the missing features." So it makes sense we should provide our features for any types which gym provides (and it's pretty easy anyway).

[chen-tianjian]

I wish to follow up with this. We wish to use akro and garage for a custom environment with MultiDiscrete actions, could you please suggest some alternative ways if MultiDiscrete is not supported?
(We tried akro.Tuple but it seems like the algorithm implementations (e.g. PPO) in garage does not support this type?)