# \#development

**URL:** https://discourse.pymc.io/tag/development/2.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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## [Bayesian Experimentation and Clinical Trial Design (Help wanted)](https://discourse.pymc.io/t/bayesian-experimentation-and-clinical-trial-design-help-wanted/17815)

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**Author:** [@Nathaniel\_Forde](https://discourse.pymc.io/u/Nathaniel_Forde)\
**Replies:** 0\
**Last updated:** [June 3, 2026, 12:16pm UTC](https://discourse.pymc.io/t/bayesian-experimentation-and-clinical-trial-design-help-wanted/17815 "2026-06-03T12:16:53Z")

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In light of the FDA guidance on Bayesian experimentation i thought it might be worth adding documentation to pymc examples on themes of: bayesian assurance, sensitivity analysis and meta analysis See PR here: Add Bayesi…

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## [Parallelization of Sequential Monte Carlo: sample\_smc](https://discourse.pymc.io/t/parallelization-of-sequential-monte-carlo-sample-smc/17712)

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**Author:** [@janwi](https://discourse.pymc.io/u/janwi)\
**Replies:** 1\
**Last updated:** [May 15, 2026, 6:41am UTC](https://discourse.pymc.io/t/parallelization-of-sequential-monte-carlo-sample-smc/17712 "2026-05-15T06:41:30Z")

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Hello everyone, I am new to PyMC and I am planning to use the SMC sampler, pm.sample\_smc, for Bayesian parameter calibration. For example: pm.sample\_smc(draws=1000, chains=1, cores=1) One attractive feature of SMC me…

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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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## [Introduction: Prospective Contributor interested in GSoC 2026 and Long-Term Involvement](https://discourse.pymc.io/t/introduction-prospective-contributor-interested-in-gsoc-2026-and-long-term-involvement/17590)

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**Author:** [@hridaii](https://discourse.pymc.io/u/hridaii)\
**Replies:** 6\
**Last updated:** [May 3, 2026, 9:29am UTC](https://discourse.pymc.io/t/introduction-prospective-contributor-interested-in-gsoc-2026-and-long-term-involvement/17590 "2026-05-03T09:29:44Z")

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Hello everyone — I’m Hridayesh Chettri from Darjeeling, India. I graduated in Physics with minors in Mathematics and Computer Applications. Presently, I’m keenly interested in Bayesian time-series and probabilistic progr…

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## [Timeseries binary-decision problem](https://discourse.pymc.io/t/timeseries-binary-decision-problem/17441)

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**Author:** [@Tester](https://discourse.pymc.io/u/Tester)\
**Replies:** 9\
**Last updated:** [April 9, 2026, 7:19pm UTC](https://discourse.pymc.io/t/timeseries-binary-decision-problem/17441 "2026-04-09T19:19:30Z")

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I have data from an experiment in which subjects repeatedly completed a specific task that required a forced binary decision (option A vs. B). I only observe this decision at the end of each recording. As predictors/IVs,…

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## [Scalable Bayesian Structural Time Series](https://discourse.pymc.io/t/scalable-bayesian-structural-time-series/17680)

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**Author:** [@Surjeet](https://discourse.pymc.io/u/Surjeet)\
**Replies:** 1\
**Last updated:** [April 9, 2026, 7:12pm UTC](https://discourse.pymc.io/t/scalable-bayesian-structural-time-series/17680 "2026-04-09T19:12:30Z")

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Hi (@jessegrabowski @Dekermanjian @ChrisFonnesbeck , I’m Surjeet from Bengaluru. I work on the production trading desk at WMX where we run real-time Bayesian state-space models daily for gold futures, BTCUSD, and forex.…

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## [Question on Nested Logit for Retail Expansion](https://discourse.pymc.io/t/question-on-nested-logit-for-retail-expansion/17626)

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**Author:** [@skalilopa](https://discourse.pymc.io/u/skalilopa)\
**Replies:** 2\
**Last updated:** [April 8, 2026, 9:38am UTC](https://discourse.pymc.io/t/question-on-nested-logit-for-retail-expansion/17626 "2026-04-08T09:38:15Z")

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Hello, I am working on a store expansion strategy: identifying optimal locations for new store openings. My approach: • I divide the trade areAa into grid cells, each representing a population segment acting as a “con…

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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: Streaming Inference & ADVI with API Data](https://discourse.pymc.io/t/gsoc-2026-streaming-inference-advi-with-api-data/17628)

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**Author:** [@Sanaica\_Dsouza](https://discourse.pymc.io/u/Sanaica_Dsouza)\
**Replies:** 3\
**Last updated:** [March 23, 2026, 9:42pm UTC](https://discourse.pymc.io/t/gsoc-2026-streaming-inference-advi-with-api-data/17628 "2026-03-23T21:42:41Z")

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Hi! I am Sanaica and I’ve been recently following the Streaming/Online Inference for GSOC 2026. Over the last few days, I’ve been benchmarking on how PyMc handles continuous data (like API of yfianace). My goal was to b…

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## [Consider adding numerically stable \`logccdf\` (log survival function) to Exponential, Weibull and other distro](https://discourse.pymc.io/t/consider-adding-numerically-stable-logccdf-log-survival-function-to-exponential-weibull-and-other-distro/17603)

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**Author:** [@vybhav72954](https://discourse.pymc.io/u/vybhav72954)\
**Replies:** 18\
**Last updated:** [March 18, 2026, 1:14pm UTC](https://discourse.pymc.io/t/consider-adding-numerically-stable-logccdf-log-survival-function-to-exponential-weibull-and-other-distro/17603 "2026-03-18T13:14:35Z")

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Hi everyone, While going through the codebase, I noticed that logccdf (the log complementary CDF, equivalent to the log survival function \\log S(t) = \\log(1 - F(t))) has a numerically stable registered implementation fo…

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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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## [ONNX Probabilistic Programming Working Group – PyMC Community Involvement](https://discourse.pymc.io/t/onnx-probabilistic-programming-working-group-pymc-community-involvement/17612)

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**Author:** [@Brian\_Parbhu](https://discourse.pymc.io/u/Brian_Parbhu)\
**Replies:** 0\
**Last updated:** [March 7, 2026, 8:04pm UTC](https://discourse.pymc.io/t/onnx-probabilistic-programming-working-group-pymc-community-involvement/17612 "2026-03-07T20:04:52Z")

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Hi everyone, A new ONNX Working Group focused on probabilistic programming has recently been formed, and we’d love to involve members of the PyMC community. The goal of this effort is to bring probabilistic modeling an…

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## [Combining multiple likelihoods for astronomical datasets](https://discourse.pymc.io/t/combining-multiple-likelihoods-for-astronomical-datasets/6115)

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**Author:** [@shbhuk](https://discourse.pymc.io/u/shbhuk)\
**Replies:** 2\
**Last updated:** [February 26, 2026, 4:54pm UTC](https://discourse.pymc.io/t/combining-multiple-likelihoods-for-astronomical-datasets/6115 "2026-02-26T16:54:27Z")

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Branching from existing topic - https://discourse.pymc.io/t/calculating-waic-for-models-with-multiple-likelihood-functions/4834 I would like to consider the possibility of combining multiple log likelihoods for model co…

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## [Feb 5th Bayesian Data Analysis Meetup Virtual Event](https://discourse.pymc.io/t/feb-5th-bayesian-data-analysis-meetup-virtual-event/17534)

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**Author:** [@Brian\_Parbhu](https://discourse.pymc.io/u/Brian_Parbhu)\
**Replies:** 3\
**Last updated:** [February 23, 2026, 2:10am UTC](https://discourse.pymc.io/t/feb-5th-bayesian-data-analysis-meetup-virtual-event/17534 "2026-02-23T02:10:29Z")

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Hi All, On Feb 5 we have a virtual event for the Bayesian Data Analysis Meetup. We’re excited to host Ian Costley (Wegmans Food Markets) for an upcoming talk on Bayesian Models in Production. Ian will share hands-on ex…

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## [Senior Pymc Data Scientist - Tech Lead for Attribution Intelligence Platform (iGaming)](https://discourse.pymc.io/t/senior-pymc-data-scientist-tech-lead-for-attribution-intelligence-platform-igaming/17526)

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**Author:** [@Timothy\_Mathews](https://discourse.pymc.io/u/Timothy_Mathews)\
**Replies:** 0\
**Last updated:** [January 17, 2026, 2:19pm UTC](https://discourse.pymc.io/t/senior-pymc-data-scientist-tech-lead-for-attribution-intelligence-platform-igaming/17526 "2026-01-17T14:19:10Z")

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Senior ML Engineer / Bayesian Attribution Lead (iGaming) Immensity.ai About Immensity.ai Immensity.ai builds production-grade Bayesian attribution and forecasting systems for iGaming operators. We focus on estimating in…

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## [Updating example notebooks without open issue](https://discourse.pymc.io/t/updating-example-notebooks-without-open-issue/17505)

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**Author:** [@Cassie\_Bastress](https://discourse.pymc.io/u/Cassie_Bastress)\
**Replies:** 1\
**Last updated:** [January 1, 2026, 9:04pm UTC](https://discourse.pymc.io/t/updating-example-notebooks-without-open-issue/17505 "2026-01-01T21:04:39Z")

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Hi, I have a quick question about contributing to the example notebooks. I found an example notebook which uses some deprecated pandas key words and uses pm.MutableData instead of pm.Data. I am all ready to submit my PR…

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## [New Contributor to PyMC Community](https://discourse.pymc.io/t/new-contributor-to-pymc-community/17504)

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**Author:** [@Subhra\_Jyoti\_Das](https://discourse.pymc.io/u/Subhra_Jyoti_Das)\
**Replies:** 0\
**Last updated:** [December 31, 2025, 8:00pm UTC](https://discourse.pymc.io/t/new-contributor-to-pymc-community/17504 "2025-12-31T20:00:04Z")

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Hello everyone! My name is Subhra Jyoti Das, a second-year engineering student at the Indian Institute of Technology Roorkee (IIT Roorkee). I have a strong interest in artificial intelligence, machine learning, and deep…

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## [New Contributor to PyMC](https://discourse.pymc.io/t/new-contributor-to-pymc/17497)

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**Author:** [@Moazzam-SK](https://discourse.pymc.io/u/Moazzam-SK)\
**Replies:** 2\
**Last updated:** [December 26, 2025, 7:03pm UTC](https://discourse.pymc.io/t/new-contributor-to-pymc/17497 "2025-12-26T19:03:35Z")

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Hello all, I’m Moazzam Shahzazd, a sophomore studying Computer Science, and I’m trying to contribute to PyMC. I’ve already opened a PR (#7979). In summary, what began as an attempt to silence a UserWarning evolved into r…

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## [Hello from a medical student and GSoC 2026 aspirant](https://discourse.pymc.io/t/hello-from-a-medical-student-and-gsoc-2026-aspirant/17454)

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**Author:** [@faraz](https://discourse.pymc.io/u/faraz)\
**Replies:** 0\
**Last updated:** [November 26, 2025, 5:27am UTC](https://discourse.pymc.io/t/hello-from-a-medical-student-and-gsoc-2026-aspirant/17454 "2025-11-26T05:27:48Z")

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Hi everyone, My name is Faraz Shamim. I am currently a 4th-year MBBS student with a strong passion for computational statistics and open-source development. Coming from a medical background, I am entirely self-taught i…

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## [Questions on dependently-sized variables (possible bug?)](https://discourse.pymc.io/t/questions-on-dependently-sized-variables-possible-bug/17414)

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**Author:** [@threepwood](https://discourse.pymc.io/u/threepwood)\
**Replies:** 10\
**Last updated:** [October 30, 2025, 10:18am UTC](https://discourse.pymc.io/t/questions-on-dependently-sized-variables-possible-bug/17414 "2025-10-30T10:18:45Z")

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Hi, asking for help around a crash I’m getting. I wrote a PyMC model which uses a derived quantity as the shape parameter of some variable. Later, I use the variable in question in some custom Op. There is some invariant…

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## [Is my model setup in proper way? Dependent Dirichlet process (DDP)](https://discourse.pymc.io/t/is-my-model-setup-in-proper-way-dependent-dirichlet-process-ddp/16864)

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**Author:** [@aga2025](https://discourse.pymc.io/u/aga2025)\
**Replies:** 1\
**Last updated:** [April 21, 2025, 9:10pm UTC](https://discourse.pymc.io/t/is-my-model-setup-in-proper-way-dependent-dirichlet-process-ddp/16864 "2025-04-21T21:10:14Z")

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Hi everyone, I am currently implementing a Dependent Dirichlet Process (DDP) mixture model in PyMC, and I do really appreciate any feedback or guidance from the community. Data used are 12 clusters features and 5 covari…

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## [Hi, I’m finalizing my GSoC proposal for PyMC—any quick thoughts?](https://discourse.pymc.io/t/hi-i-m-finalizing-my-gsoc-proposal-for-pymc-any-quick-thoughts/16847)

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**Author:** [@avinash\_bhargav](https://discourse.pymc.io/u/avinash_bhargav)\
**Replies:** 0\
**Last updated:** [April 8, 2025, 9:39am UTC](https://discourse.pymc.io/t/hi-i-m-finalizing-my-gsoc-proposal-for-pymc-any-quick-thoughts/16847 "2025-04-08T09:39:54Z")

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PyMC is a powerful tool for Bayesian modeling, but its integration with modern deep learning techniques remains underexplored. This project aims to enhance PyMC by incorporating advanced neural network capabilities, suc…

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## [Generalized LV: missing 1 required positional argument using pymc.ode.DifferentialEquation](https://discourse.pymc.io/t/generalized-lv-missing-1-required-positional-argument-using-pymc-ode-differentialequation/16756)

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**Author:** [@snjie209](https://discourse.pymc.io/u/snjie209)\
**Replies:** 0\
**Last updated:** [March 25, 2025, 5:12pm UTC](https://discourse.pymc.io/t/generalized-lv-missing-1-required-positional-argument-using-pymc-ode-differentialequation/16756 "2025-03-25T17:12:41Z")

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Hi team, I am trying to train a generalized Lotka Volterra using pymc. I have a 500 x 30 dataset where there are 500 data points and 30 time series. # Run only in the beginning !pip install --force-reinstall numpy==1.…

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## [Choice-Based Conjoint Data Using A Hierarchical Logit Model](https://discourse.pymc.io/t/choice-based-conjoint-data-using-a-hierarchical-logit-model/16669)

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**Author:** [@wleopach](https://discourse.pymc.io/u/wleopach)\
**Replies:** 6\
**Last updated:** [March 14, 2025, 4:34pm UTC](https://discourse.pymc.io/t/choice-based-conjoint-data-using-a-hierarchical-logit-model/16669 "2025-03-14T16:34:49Z")

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Hello, I am trying to write an implementation for this model for the camera dataset bayesm Overview, my model already runs for 2 clients and for 332 clients it takes to long to start the sampling. Can you give me a hint…

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## [Dims Argument for Univariate Target Data](https://discourse.pymc.io/t/dims-argument-for-univariate-target-data/14906)

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**Author:** [@paschermayr](https://discourse.pymc.io/u/paschermayr)\
**Replies:** 5\
**Last updated:** [February 12, 2025, 8:55pm UTC](https://discourse.pymc.io/t/dims-argument-for-univariate-target-data/14906 "2025-02-12T20:55:07Z")

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Hi there, I would like to define the dimensionality of my data via coords/dims, independent if either the feature or target data is multivariate or univariate. As such, I would always like to define the data via dims = …

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## [PSA: \`pymc\_experimental\` is now \`pymc\_extras\`](https://discourse.pymc.io/t/psa-pymc-experimental-is-now-pymc-extras/16332)

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**Author:** [@jessegrabowski](https://discourse.pymc.io/u/jessegrabowski)\
**Replies:** 1\
**Last updated:** [January 3, 2025, 4:25pm UTC](https://discourse.pymc.io/t/psa-pymc-experimental-is-now-pymc-extras/16332 "2025-01-03T16:25:04Z")

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As of recently, the pymc companion package pymc\_experimental has been renamed to pymc\_extras. Please be sure to update your dependencies accordingly! If you don’t know, pymc\_extras is a place where we implement new func…

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## [Getting random variables in my logp function while using pymc\_extras.statespace](https://discourse.pymc.io/t/getting-random-variables-in-my-logp-function-while-using-pymc-extras-statespace/16323)

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**Author:** [@agonzago](https://discourse.pymc.io/u/agonzago)\
**Replies:** 4\
**Last updated:** [January 2, 2025, 3:28pm UTC](https://discourse.pymc.io/t/getting-random-variables-in-my-logp-function-while-using-pymc-extras-statespace/16323 "2025-01-02T15:28:49Z")

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Hi all, I’m new to PyMC (thanks to the community and the contributors for this amazing library!). I’m developing a BVAR model that should, in principle, work with the state-space implementation. While I’ve managed to se…

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## [Modeling of multiple regression model with array form](https://discourse.pymc.io/t/modeling-of-multiple-regression-model-with-array-form/12430)

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**Author:** [@selmainger326](https://discourse.pymc.io/u/selmainger326)\
**Replies:** 12\
**Last updated:** [December 17, 2024, 10:25pm UTC](https://discourse.pymc.io/t/modeling-of-multiple-regression-model-with-array-form/12430 "2024-12-17T22:25:31Z")

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Hello. I am a beginner in Bayesian Inference and PYMC (Also Python). I have studied multi-objective predictive control using machine learning and deep learning. I wonder whether users can develop the regression (or GP…

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## ['dayofyear' in sample\_posterior\_predictive Call in PyMC-Marketing](https://discourse.pymc.io/t/dayofyear-in-sample-posterior-predictive-call-in-pymc-marketing/16073)

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**Author:** [@AnSaejin](https://discourse.pymc.io/u/AnSaejin)\
**Replies:** 2\
**Last updated:** [November 21, 2024, 5:08pm UTC](https://discourse.pymc.io/t/dayofyear-in-sample-posterior-predictive-call-in-pymc-marketing/16073 "2024-11-21T17:08:53Z")

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Title: KeyError: ‘dayofyear’ in sample\_posterior\_predictive Call in PyMC-Marketing Question: Hello, I’m using PyMC-Marketing to build a Marketing Mix Model (MMM). While running sample\_posterior\_predictive on my model, I…

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## [Not divergences but high R hat](https://discourse.pymc.io/t/not-divergences-but-high-r-hat/16090)

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**Author:** [@andrea\_garcia](https://discourse.pymc.io/u/andrea_garcia)\
**Replies:** 1\
**Last updated:** [November 8, 2024, 4:52pm UTC](https://discourse.pymc.io/t/not-divergences-but-high-r-hat/16090 "2024-11-08T16:52:23Z")

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Hi, I am implementing a version of the Stochastic Block Model with very simple priors. I don’t have divergences, but the R-hat is still higher than 1.01 for three of the parameters. I’m not sure how to improve it. Any he…

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