Where are hidden the info about Mujoco's environments ?

[ccolas]

Hello everyone,

I just started to work with the Half-Cheetah environment and cannot find any info about it. I checked papers, gym doc, wiki, mujoco's doc, even the .xml file..
The .xml contains some info about the states and actions, however, they don't seem correct: it describes 18 state features but the output of the 'step' function is of shape (17,)..

Does anyone know where we could find such information ? It's really short to write, I cannot believe the environment was made available without any information. Moreover people are using it for experiments..

I'm especially interest in the following questions:

• what are the different observations ?
• what are their true domains (I don't think the angular velocity can take an infinite value..) ?
  I plan on using Hopper and Reacher afterwards so if you have any hints about these environments' info I would be delighted.

I know other people have raised the question here in more general topics, but no one has been answered.

Thank you very much.

[cristyandavid1]

I’m 1.6

[jkterry1]

PR #2762 is about to be merged, introducing V4 MuJoCo environments using new bindings and a dramatically newer version of the engine. If this issue still persists with the V4 ones, please create a new issue for it.