# Incorporating QMIX and VDN?

**URL:** <https://discuss.ray.io/t/incorporating-qmix-and-vdn/15425>\
**Category:** Uncategorized\
**Created:** [August 2, 2024, 9:02am UTC](https://discuss.ray.io/t/incorporating-qmix-and-vdn/15425 "2024-08-02T09:02:53Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![ardian-selmonaj](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ray.io/ardian-selmonaj/32/3713_2.png) [@ardian-selmonaj](https://discuss.ray.io/u/ardian-selmonaj)\
**Post date:** [August 2, 2024, 9:02am UTC](https://discuss.ray.io/t/incorporating-qmix-and-vdn/15425/1 "2024-08-02T09:02:53Z")

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Hello, from a previous RLlib version I know that QMIX and VDN were included, but now they are not available as training algorithms. Do you plan to include them back in the future?

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**Author:** ![Lars\_Simon\_Zehnder](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ray.io/lars_simon_zehnder/32/1185_2.png) [@Lars\_Simon\_Zehnder](https://discuss.ray.io/u/Lars_Simon_Zehnder)\
**Post date:** [August 6, 2024, 8:50am UTC](https://discuss.ray.io/t/incorporating-qmix-and-vdn/15425/2 "2024-08-06T08:50:42Z")

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Hi @ardian-selmonaj,

the QMIX algorithm is still available in our old stack in `rllib-contrib` (see [here](https://github.com/ray-project/ray/tree/master/rllib_contrib)).

If we include QMIX again in the new stack is unclear, yet, and if so will only come after the Summit. VDN is not in discussion.

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**Author:** ![jiangpeng\_li](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ray.io/jiangpeng_li/32/5908_2.png) [@jiangpeng\_li](https://discuss.ray.io/u/jiangpeng_li)\
**Post date:** [December 3, 2024, 8:39am UTC](https://discuss.ray.io/t/incorporating-qmix-and-vdn/15425/3 "2024-12-03T08:39:21Z")

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It seems that `rllib-contrib` is gone. 😢  
Is there any plan to add it back?

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**Author:** ![Lars\_Simon\_Zehnder](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ray.io/lars_simon_zehnder/32/1185_2.png) [@Lars\_Simon\_Zehnder](https://discuss.ray.io/u/Lars_Simon_Zehnder)\
**Post date:** [December 3, 2024, 5:12pm UTC](https://discuss.ray.io/t/incorporating-qmix-and-vdn/15425/4 "2024-12-03T17:12:18Z")

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@jiangpeng_li That is true, we deprecated these algorithms for goopd because they are all written in our old stack and new stack is now the only supported one.

You can always roll back to an older RLlib version (because these algorithms are not changed anyways by us) and use this version to run them.

Every version below `ray==2.37.0` should make it.