add HER support for MultiDiscrete obs spaces

[giorgionicola]

in her/utils.py Multidiscrete obsaervation spaces are not supported, is there an easy way to support them (obviously a part from translating it in a Discrete space)?

Is it planned to add Multidiscrete obs a spaces since DQN support them?

[araffin]

Hello,

Is it planned to add Multidiscrete obs a spaces since DQN support them?

This is not planned as we are focusing on the v3.0 for now (and avoid adding new features). The current roadmap is defined here: https://github.com/hill-a/stable-baselines/milestone/4

is there an easy way to support them

As a quick fix, you can convert it to a Box space as a first approximation or even better, do the pre-processing (converting to one hot encoding) in the environment.