# How to use the algorithms in rllib-contrib?

**URL:** <https://discuss.ray.io/t/how-to-use-the-algorithms-in-rllib-contrib/13923>\
**Category:** Steps to contribute to RLlib\
**Created:** [March 6, 2024, 2:27pm UTC](https://discuss.ray.io/t/how-to-use-the-algorithms-in-rllib-contrib/13923 "2024-03-06T14:27:20Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![hermmanhender](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ray.io/hermmanhender/32/5691_2.png) [@hermmanhender](https://discuss.ray.io/u/hermmanhender)\
**Post date:** [March 6, 2024, 2:27pm UTC](https://discuss.ray.io/t/how-to-use-the-algorithms-in-rllib-contrib/13923/1 "2024-03-06T14:27:20Z")

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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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**Author:** ![Longhao\_Xie](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ray.io/longhao_xie/32/5980_2.png) [@Longhao\_Xie](https://discuss.ray.io/u/Longhao_Xie)\
**Post date:** [April 11, 2024, 3:42am UTC](https://discuss.ray.io/t/how-to-use-the-algorithms-in-rllib-contrib/13923/2 "2024-04-11T03:42:10Z")

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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.