How to use the algorithms in rllib-contrib?

Hi!
I am currently seeking assistance with implementing the QMix algorithm in a custom multiagent environment. Despite attempting to install the algorithm using the command pip install rllib-qmix, I encountered difficulties. Could someone provide guidance on how to properly install algorithms from the contrib section?

Thank you in advance for any assistance provided.
Germán

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I had a similar problem installing rllib-contrib. In order to use the algorithms in rllib-contrib, I downgraded rllib to version 2.6.0. Rllib-2.6.0 includes the most algorithms in rllib-contrib.