# Development

**URL:** https://discourse.pymc.io/c/development/8.md

[Latest](https://discourse.pymc.io/latest.md) · [Categories](https://discourse.pymc.io/categories.md) · [Tags](https://discourse.pymc.io/tags.md)

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## [Support symbolic eta parameter in LKJCholeskyCov.logp](https://discourse.pymc.io/t/support-symbolic-eta-parameter-in-lkjcholeskycov-logp/17909)

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**Author:** [@Ray729](https://discourse.pymc.io/u/Ray729)\
**Replies:** 2\
**Last updated:** [August 15, 2026, 6:21pm UTC](https://discourse.pymc.io/t/support-symbolic-eta-parameter-in-lkjcholeskycov-logp/17909 "2026-08-15T18:21:31Z")

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Hi everyone, I came across an open TODO in pymc/distributions/multivariate.py (around line 1297) for \_LKJCholeskyCovRV\_logp. # TODO: \_lkj\_normalizing\_constant currently requires \`eta\` and \`n\` to be constants try: e…

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## [PyMC4 improvements over PyMC3](https://discourse.pymc.io/t/pymc4-improvements-over-pymc3/2362)

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**Author:** [@simon\_o](https://discourse.pymc.io/u/simon_o)\
**Replies:** 2\
**Last updated:** [August 11, 2026, 8:35pm UTC](https://discourse.pymc.io/t/pymc4-improvements-over-pymc3/2362 "2026-08-11T20:35:51Z")

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Forgive me if that has already been addressed, but is there some documentation that summarizes the expected/targeted improvements of PyMC4 over PyMC3? What are the main motivations/ideas behind PyMC4?Just curious.

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## [New contributor looking to get started — background in ML/RAG research](https://discourse.pymc.io/t/new-contributor-looking-to-get-started-background-in-ml-rag-research/17889)

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**Author:** [@Lakshya\_Pandey](https://discourse.pymc.io/u/Lakshya_Pandey)\
**Replies:** 3\
**Last updated:** [August 8, 2026, 6:23pm UTC](https://discourse.pymc.io/t/new-contributor-looking-to-get-started-background-in-ml-rag-research/17889 "2026-08-08T18:23:27Z")

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Hi everyone :waving\_hand: I’m Lakshya, a B.Tech CSE (AI & ML) student. I currently work as an AI Research Contributor at MIT CSAIL (Mantis AI, under Prof. Manolis Kellis) and also contribute to terrierteam/pyterrier\_rag…

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## [Regarding GSOC 2027 and PyMC projects](https://discourse.pymc.io/t/regarding-gsoc-2027-and-pymc-projects/17896)

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**Author:** [@Somil\_Gupta](https://discourse.pymc.io/u/Somil_Gupta)\
**Replies:** 0\
**Last updated:** [July 28, 2026, 2:36pm UTC](https://discourse.pymc.io/t/regarding-gsoc-2027-and-pymc-projects/17896 "2026-07-28T14:36:42Z")

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Hi Somil Gupta here , I am a Computer science and Applied Mathematics Undergrad at IIIT Delhi . I am interested in the project named " Linear Algebra Rewrites " and was wondering what is it’s current state and if it is …

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## [Online bayesian smoothing for streaming state space models](https://discourse.pymc.io/t/online-bayesian-smoothing-for-streaming-state-space-models/17883)

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**Author:** [@Dhairya](https://discourse.pymc.io/u/Dhairya)\
**Replies:** 2\
**Last updated:** [July 24, 2026, 7:21pm UTC](https://discourse.pymc.io/t/online-bayesian-smoothing-for-streaming-state-space-models/17883 "2026-07-24T19:21:44Z")

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hi all, and especially @jessegrabowski (following up on PR #8333!) a couple of weeks back i made a regime switching volatility stress tester using 100k synthetic equity tick returns to check out PR #8333 for the new str…

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## [greetings from a new contributor + Quick ping on a GP PR (#6649)](https://discourse.pymc.io/t/greetings-from-a-new-contributor-quick-ping-on-a-gp-pr-6649/17856)

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**Author:** [@Dhairya](https://discourse.pymc.io/u/Dhairya)\
**Replies:** 0\
**Last updated:** [June 21, 2026, 5:11am UTC](https://discourse.pymc.io/t/greetings-from-a-new-contributor-quick-ping-on-a-gp-pr-6649/17856 "2026-06-21T05:11:12Z")

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Hi everyone! I would like to introduce myself to the community. Im a 2nd yr CS student and have become very interested in learning quantitative finance, probabilistic programming and bayesian statistics. PyMC looks like…

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## [Suggestion: Convergence Termination or Free running Sampler?](https://discourse.pymc.io/t/suggestion-convergence-termination-or-free-running-sampler/17790)

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**Author:** [@brandonhorsley](https://discourse.pymc.io/u/brandonhorsley)\
**Replies:** 6\
**Last updated:** [June 2, 2026, 9:01pm UTC](https://discourse.pymc.io/t/suggestion-convergence-termination-or-free-running-sampler/17790 "2026-06-02T21:01:13Z")

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Hi all, it has been a while as I have been busy! But I wanted to put here a suggestion I have had in my mind for a while and so i wondered what others would think about it as I was reminded of it this morning! In my exp…

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## [Call for Feedback: BayesFlow Wrapper for PyMC](https://discourse.pymc.io/t/call-for-feedback-bayesflow-wrapper-for-pymc/17708)

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**Author:** [@Stefan\_Radev](https://discourse.pymc.io/u/Stefan_Radev)\
**Replies:** 1\
**Last updated:** [May 11, 2026, 3:28pm UTC](https://discourse.pymc.io/t/call-for-feedback-bayesflow-wrapper-for-pymc/17708 "2026-05-11T15:28:46Z")

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Hi All, I am one of the developers of BayesFlow, which is a multi-backend library for amortized Bayesian inference. In the latest release, we have included an alpha-version of a PyMC wrapper which lets us plug a trained…

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## [GSoC 2026: Interest in Scalable Online Bayesian State Space Models Project](https://discourse.pymc.io/t/gsoc-2026-interest-in-scalable-online-bayesian-state-space-models-project/17676)

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**Author:** [@Shraddha\_Sharma](https://discourse.pymc.io/u/Shraddha_Sharma)\
**Replies:** 0\
**Last updated:** [March 30, 2026, 5:47am UTC](https://discourse.pymc.io/t/gsoc-2026-interest-in-scalable-online-bayesian-state-space-models-project/17676 "2026-03-30T05:47:03Z")

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Hi Everyone, My name is Shraddha Sharma. I graduated with a Master’s degree in Robotics and Artificial Intelligence from Nanyang Technological University, Singapore in 2020. I am writing to express my interest in the p…

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## [GSoC 2026 - Survival Models - Intent and Intro!](https://discourse.pymc.io/t/gsoc-2026-survival-models-intent-and-intro/17666)

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**Author:** [@vybhav72954](https://discourse.pymc.io/u/vybhav72954)\
**Replies:** 1\
**Last updated:** [March 29, 2026, 5:35am UTC](https://discourse.pymc.io/t/gsoc-2026-survival-models-intent-and-intro/17666 "2026-03-29T05:35:53Z")

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Hi everyone, I’m Vybhav Chaturvedi, interested in the Survival Models project for GSoC 2026. I’ve been actively contributing to PyMC’s infrastructure and wanted to share what I’ve done and where I think the project coul…

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## [GSoC 2026: Online Sequential Updates for Bayesian State Space Models](https://discourse.pymc.io/t/gsoc-2026-online-sequential-updates-for-bayesian-state-space-models/17654)

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**Author:** [@YichengYang](https://discourse.pymc.io/u/YichengYang)\
**Replies:** 7\
**Last updated:** [March 28, 2026, 8:36pm UTC](https://discourse.pymc.io/t/gsoc-2026-online-sequential-updates-for-bayesian-state-space-models/17654 "2026-03-28T20:36:23Z")

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Hi everyone — I’m Yicheng Yang, a junior at UIUC studying Computer Science, Statistics, and Economics. I’m applying for GSoC 2026 and wanted to introduce myself and share my early thinking on the online state space model…

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## [GSOC 2026: Linear Algebra Rewrites](https://discourse.pymc.io/t/gsoc-2026-linear-algebra-rewrites/17638)

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**Author:** [@Jasjeet-Singh-S](https://discourse.pymc.io/u/Jasjeet-Singh-S)\
**Replies:** 2\
**Last updated:** [March 27, 2026, 9:27pm UTC](https://discourse.pymc.io/t/gsoc-2026-linear-algebra-rewrites/17638 "2026-03-27T21:27:48Z")

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Hello, I am Jasjeet Singh, currently pursuing Btech in computer science from Punjab University. I’ve spent the past 6-8 months learning CUDA for machine learning AI purposes and have developed working knowledge of GEMM a…

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## [GSoC 2026 Actuarial Survival Models: Tackling Left-Truncation & Declarative API Vision](https://discourse.pymc.io/t/gsoc-2026-actuarial-survival-models-tackling-left-truncation-declarative-api-vision/17669)

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**Author:** [@ZHANGSHUO22](https://discourse.pymc.io/u/ZHANGSHUO22)\
**Replies:** 0\
**Last updated:** [March 26, 2026, 8:50pm UTC](https://discourse.pymc.io/t/gsoc-2026-actuarial-survival-models-tackling-left-truncation-declarative-api-vision/17669 "2026-03-26T20:50:38Z")

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Hi PyMC Team and Mentors, My name is Shuo Zhang, an MSc grad in Financial & Insurance Mathematics at Charles University and an Actuary Candidate (passed SOA exams P & FM). I am incredibly excited about the Survival Mode…

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## [GSoC 2026: Declarative API for Bayesian Survival Analysis](https://discourse.pymc.io/t/gsoc-2026-declarative-api-for-bayesian-survival-analysis/17668)

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**Author:** [@Mithil\_A](https://discourse.pymc.io/u/Mithil_A)\
**Replies:** 0\
**Last updated:** [March 26, 2026, 3:42am UTC](https://discourse.pymc.io/t/gsoc-2026-declarative-api-for-bayesian-survival-analysis/17668 "2026-03-26T03:42:16Z")

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Hi Chris, Bill (Mentors) and the PyMC community, My name is Mithilesh, and I am putting together a proposal for the GSoC 2026 Bayesian Survival Models project. I really love the idea of building a high-level declarativ…

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## [Interest in GSOC 2026: Nearest-Neighbor GP](https://discourse.pymc.io/t/interest-in-gsoc-2026-nearest-neighbor-gp/17653)

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**Author:** [@justinochoi](https://discourse.pymc.io/u/justinochoi)\
**Replies:** 4\
**Last updated:** [March 25, 2026, 4:46pm UTC](https://discourse.pymc.io/t/interest-in-gsoc-2026-nearest-neighbor-gp/17653 "2026-03-25T16:46:36Z")

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Hi everyone, My name is Justin Choi, a recent graduate of WashU. I currently work for the Cleveland Guardians as an Associate Data Scientist. I’ve been an avid user of PyMC for about a year now, and am a beginner with o…

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## [Bart Rust Development](https://discourse.pymc.io/t/bart-rust-development/17658)

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**Author:** [@big\_data\_mike](https://discourse.pymc.io/u/big_data_mike)\
**Replies:** 2\
**Last updated:** [March 25, 2026, 12:49am UTC](https://discourse.pymc.io/t/bart-rust-development/17658 "2026-03-25T00:49:54Z")

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I was able to fork @gstechschulte ‘s rust version of BART and get a pretty nice version running with updated packages here. I have a pull request PR which isn’t passing tests or something. The PR is just for my update\_…

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## [GSoC 2026: spatial modeling nearest neighbor project](https://discourse.pymc.io/t/gsoc-2026-spatial-modeling-nearest-neighbor-project/17665)

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**Author:** [@Emanuele-Elias](https://discourse.pymc.io/u/Emanuele-Elias)\
**Replies:** 0\
**Last updated:** [March 24, 2026, 8:53pm UTC](https://discourse.pymc.io/t/gsoc-2026-spatial-modeling-nearest-neighbor-project/17665 "2026-03-24T20:53:31Z")

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Hello @fonnesbeck @bwengals I would like to apply for the GSoC project about spatial modelling. I would be particularly interested in the implementation of the nearest neighbor GP method. here you can find the draft of m…

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## [GSoC 2026: Streaming Variational Inference for Large Datasets](https://discourse.pymc.io/t/gsoc-2026-streaming-variational-inference-for-large-datasets/17655)

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**Author:** [@YichengYang](https://discourse.pymc.io/u/YichengYang)\
**Replies:** 2\
**Last updated:** [March 24, 2026, 2:22am UTC](https://discourse.pymc.io/t/gsoc-2026-streaming-variational-inference-for-large-datasets/17655 "2026-03-24T02:22:52Z")

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Hi — I’m Yicheng Yang, a junior at UIUC (CS + Statistics + Economics), applying for GSoC 2026. I wanted to share my thinking on the streaming variational inference direction and get some early feedback. Background I tak…

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## [GSOC 2026: Scalable Bayesian Structural Time Series](https://discourse.pymc.io/t/gsoc-2026-scalable-bayesian-structural-time-series/17652)

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**Author:** [@Mithil\_A](https://discourse.pymc.io/u/Mithil_A)\
**Replies:** 0\
**Last updated:** [March 22, 2026, 11:40am UTC](https://discourse.pymc.io/t/gsoc-2026-scalable-bayesian-structural-time-series/17652 "2026-03-22T11:40:03Z")

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Hi PyMC Community and Mentors, My name is Mithilesh, and I am preparing a proposal for Google Summer of Code 2026 to work on expanding the pymc.timeseries module by implementing a modular API for Bayesian Structural Tim…

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## [\[GSoC 2026\] Proposal Feedback: Scalable Bayesian Structural Time Series (BSTS) & State Space Models](https://discourse.pymc.io/t/gsoc-2026-proposal-feedback-scalable-bayesian-structural-time-series-bsts-state-space-models/17645)

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**Author:** [@Mithil\_A](https://discourse.pymc.io/u/Mithil_A)\
**Replies:** 0\
**Last updated:** [March 19, 2026, 2:45pm UTC](https://discourse.pymc.io/t/gsoc-2026-proposal-feedback-scalable-bayesian-structural-time-series-bsts-state-space-models/17645 "2026-03-19T14:45:11Z")

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Hi PyMC Community and Mentors, My name is Mithilesh, and I am preparing a proposal for Google Summer of Code 2026 to work on expanding the pymc.timeseries module by implementing a modular API for Bayesian Structural Tim…

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## [GSoC 2026: Interest in Survival Models](https://discourse.pymc.io/t/gsoc-2026-interest-in-survival-models/17587)

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**Author:** [@Niccolo\_Ciucci](https://discourse.pymc.io/u/Niccolo_Ciucci)\
**Replies:** 3\
**Last updated:** [March 18, 2026, 5:38pm UTC](https://discourse.pymc.io/t/gsoc-2026-interest-in-survival-models/17587 "2026-03-18T17:38:55Z")

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Hi everyone! My name is Niccolò, I am a PhD student in AI at Sapienza University and a researcher at the Bank of Italy. I am writing to express my interest in the Survival Models project for GSoC 2026. I’m currently fo…

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## [GSoC 2026: Interested in Spatial Modelling](https://discourse.pymc.io/t/gsoc-2026-interested-in-spatial-modelling/17640)

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**Author:** [@Emanuele-Elias](https://discourse.pymc.io/u/Emanuele-Elias)\
**Replies:** 0\
**Last updated:** [March 17, 2026, 10:08pm UTC](https://discourse.pymc.io/t/gsoc-2026-interested-in-spatial-modelling/17640 "2026-03-17T22:08:18Z")

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Hi everyone, My name is Emanuele, I am an applied math and data science master’s student and in the last few weeks I tried contributing to pymc with a couple of PRs. I am very interested in participating in GSoC 2026 wi…

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## [GSoC 2026: Scalable Online Bayesian State Space Models](https://discourse.pymc.io/t/gsoc-2026-scalable-online-bayesian-state-space-models/17624)

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**Author:** [@harshiljsoni](https://discourse.pymc.io/u/harshiljsoni)\
**Replies:** 1\
**Last updated:** [March 16, 2026, 8:49pm UTC](https://discourse.pymc.io/t/gsoc-2026-scalable-online-bayesian-state-space-models/17624 "2026-03-16T20:49:29Z")

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Hi! I am Harshil J Soni,currently a 3rd Year Undergrad studying Computer Science.My interests lie in scientific machine learning, where mathematical modeling and computational methods come together to analyze complex sys…

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## [Introduction: GSoC 2026 Contributor — Diego](https://discourse.pymc.io/t/introduction-gsoc-2026-contributor-diego/17606)

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**Author:** [@Diegomed11](https://discourse.pymc.io/u/Diegomed11)\
**Replies:** 4\
**Last updated:** [March 10, 2026, 3:39pm UTC](https://discourse.pymc.io/t/introduction-gsoc-2026-contributor-diego/17606 "2026-03-10T15:39:11Z")

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Introduction: GSoC 2026 Contributor — Diego Medina Hi everyone! I’m Diego Medina, a Data Science student at ESCOM (Instituto Politécnico Nacional) in Mexico City. I’m interested in contributing to PyMC for GSoC 2026. Ba…

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## [GSoC 2026: Interested in Contributing to PyMC](https://discourse.pymc.io/t/gsoc-2026-interested-in-contributing-to-pymc/17613)

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**Author:** [@Varshini](https://discourse.pymc.io/u/Varshini)\
**Replies:** 1\
**Last updated:** [March 10, 2026, 5:39am UTC](https://discourse.pymc.io/t/gsoc-2026-interested-in-contributing-to-pymc/17613 "2026-03-10T05:39:39Z")

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Hi PyMC Community! I’m preparing for GSoC 2026 and very interested in contributing to PyMC. I have a background in Python, machine learning fundamentals, and recently started contributing to open source (2 merged PRs in…

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## [Feedback requested: bioassay example, Windows RuntimeError, and docs improvements](https://discourse.pymc.io/t/feedback-requested-bioassay-example-windows-runtimeerror-and-docs-improvements/17596)

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**Author:** [@hridaii](https://discourse.pymc.io/u/hridaii)\
**Replies:** 0\
**Last updated:** [February 27, 2026, 3:30pm UTC](https://discourse.pymc.io/t/feedback-requested-bioassay-example-windows-runtimeerror-and-docs-improvements/17596 "2026-02-27T15:30:36Z")

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Hi @fonnesbeck I’ve been working through your Data Umbrella talk on PyMC and found it extremely helpful. Thank you for the great introduction to PyMC. While following the example Bioassay Problem model, I encountered a…

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## [Contributing Zero-Inflated Beta Distribution](https://discourse.pymc.io/t/contributing-zero-inflated-beta-distribution/17581)

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**Author:** [@nshin0911](https://discourse.pymc.io/u/nshin0911)\
**Replies:** 4\
**Last updated:** [February 24, 2026, 12:16pm UTC](https://discourse.pymc.io/t/contributing-zero-inflated-beta-distribution/17581 "2026-02-24T12:16:55Z")

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Hello PyMC community, I am planning to contribute a Zero-Inflated Beta distribution to PyMC. Such a contribution would be useful for modeling proportions/rates on \[0,1) with structural zeros, common in healthcare and ec…

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## [Contributing to pymc-bart-rs](https://discourse.pymc.io/t/contributing-to-pymc-bart-rs/17517)

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**Author:** [@mikesmith5446](https://discourse.pymc.io/u/mikesmith5446)\
**Replies:** 5\
**Last updated:** [January 23, 2026, 6:28am UTC](https://discourse.pymc.io/t/contributing-to-pymc-bart-rs/17517 "2026-01-23T06:28:37Z")

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I do BART models all the time for work so to speed things up I started using pymc-bart-rs. It had errors when I tried to use the plotting functions so I checked out a branch, made some changes (with chatgpt for the rust…

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## [Need Guidance: Implementing Dims for Multivariate distributions](https://discourse.pymc.io/t/need-guidance-implementing-dims-for-multivariate-distributions/17533)

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**Author:** [@Moazzam-SK](https://discourse.pymc.io/u/Moazzam-SK)\
**Replies:** 1\
**Last updated:** [January 21, 2026, 10:28pm UTC](https://discourse.pymc.io/t/need-guidance-implementing-dims-for-multivariate-distributions/17533 "2026-01-21T22:28:22Z")

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I’m a new guy here. I’m trying to implement dims for multivariate distributions, starting with MvStudentT, but I can’t exactly understand how to write the dist() and xrv\_op() functions. I have a slight understanding of w…

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## [Introduction - GSoC 2026 Aspirant](https://discourse.pymc.io/t/introduction-gsoc-2026-aspirant/17530)

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**Author:** [@Varshini](https://discourse.pymc.io/u/Varshini)\
**Replies:** 0\
**Last updated:** [January 20, 2026, 9:17am UTC](https://discourse.pymc.io/t/introduction-gsoc-2026-aspirant/17530 "2026-01-20T09:17:19Z")

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Hi PyMC Community! I’m S Varshini, preparing for GSoC 2026 and interested in contributing to PyMC. Background: Python programming (NumPy, pandas basics) Learning Bayesian statistics and machine learning Just made my …

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