# Is PyMC4 dead or just resting?

**URL:** <https://discourse.pymc.io/t/is-pymc4-dead-or-just-resting/5330>\
**Category:** Development\
**Created:** [June 24, 2020, 10:29am UTC](https://discourse.pymc.io/t/is-pymc4-dead-or-just-resting/5330 "2020-06-24T10:29:00Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![bridgeland](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/bridgeland/32/2773_2.png) [@bridgeland](https://discourse.pymc.io/u/bridgeland)\
**Post date:** [June 24, 2020, 10:29am UTC](https://discourse.pymc.io/t/is-pymc4-dead-or-just-resting/5330/1 "2020-06-24T10:29:00Z")

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There were many contributions to the PyMC4 repository in 2019, but few since then. Have the contributors lost interest? Decided that the project was a mistake? Decided to model directly in TensorFlow Probability? Or perhaps everyone is busy with other projects, and plan to return to PyMC4 when they free up?

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**Author:** ![junpenglao](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/junpenglao/32/8_2.png) [@junpenglao](https://discourse.pymc.io/u/junpenglao)\
**Post date:** [June 24, 2020, 3:30pm UTC](https://discourse.pymc.io/t/is-pymc4-dead-or-just-resting/5330/2 "2020-06-24T15:30:44Z")

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We have quite a few new GSOC projects to add more features, so stay tuned 😉 There were some road blocks on the sampling front on the TFP side (having a fast and reliable way to tune mass matrix), but we are making some good progress (e.g., [https://github.com/tensorflow/probability/tree/master/discussion/turnkey\_inference\_candidate](https://github.com/tensorflow/probability/tree/master/discussion/turnkey_inference_candidate))

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**Author:** ![lucianopaz](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/lucianopaz/32/2186_2.png) [@lucianopaz](https://discourse.pymc.io/u/lucianopaz)\
**Post date:** [June 24, 2020, 9:20pm UTC](https://discourse.pymc.io/t/is-pymc4-dead-or-just-resting/5330/3 "2020-06-24T21:20:36Z")

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In my particular case, with the covid lockdown I have to focus the little time I have in between family and house keeping activities to my paying job. I have been trying to keep contributing small infrastructure things like docstrings, but I won’t be able to put time in the near future into the core work that still needs to be done.

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**Author:** ![ericmjl](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/ericmjl/32/196_2.png) [@ericmjl](https://discourse.pymc.io/u/ericmjl)\
**Post date:** [July 26, 2020, 2:56pm UTC](https://discourse.pymc.io/t/is-pymc4-dead-or-just-resting/5330/4 "2020-07-26T14:56:01Z")

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I’m also waiting on a progress bar for the samplers… 😉

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**Author:** ![bridgeland](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/bridgeland/32/2773_2.png) [@bridgeland](https://discourse.pymc.io/u/bridgeland)\
**Post date:** [November 2, 2020, 2:41pm UTC](https://discourse.pymc.io/t/is-pymc4-dead-or-just-resting/5330/5 "2020-11-02T14:41:44Z")

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Update: [PyMC4 is dead](https://discourse.pymc.io/t/the-future-of-pymc3-or-theano-is-dead-long-live-theano/6159/2). The future of PyMC3 is PyMC3, with a JAX backend.