pymc-devs/pymc

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Bayesian Modeling and Probabilistic Programming in Python

Stars: 9.8k
Forks: 2.3k
Open beginner issues: 4
Indexed issues: 313
Avg merge: 21h 39m
Merged PRs (30d): 5

Dominant language: Python
License: No license data
Last GitHub push: Sep 13, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted

Beginner friendly Everything

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313 open issues indexed

`LogitNormal` gets no default transform, unlike other unit-interval distributions Open

Difficulty 3/5 1-2 days Newbie friendliness 62/100

pymc-devs/pymc#8441 · 3 comments · Opened Sep 15, 2026
DOC: Fix raw LaTeX math syntax and grammar in GARCH11 docstring Open

Difficulty 1/5 Under an hour Newbie friendliness 95/100

pymc-devs/pymc#8439 · 1 comment · Opened Sep 14, 2026
BUG: Moyal logcdf returns -inf in lower tail where value is finite Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

pymc-devs/pymc#8437 · 2 comments · Opened Sep 14, 2026
BUG: Cauchy and StudentT logcdf return -inf in the lower tail where the true value is finite Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pymc-devs/pymc#8435 · Opened Sep 14, 2026
DOC: Fix documentation formatting, LaTeX, parameter metadata, and type declarations in continuous distributions Open

docs

Difficulty 2/5 1-3 hours Newbie friendliness 83/100

pymc-devs/pymc#8431 · 2 comments · Opened Sep 13, 2026
BUG: HSGP set_boundary causes unhandled divide by zero and inf eigenvalues when feature range is zero Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

pymc-devs/pymc#8427 · 2 comments · Opened Sep 10, 2026
ENH: Enable batch size > 1 for CAR distribution Open

feature request

Difficulty 4/5 3-5 days Newbie friendliness 55/100

pymc-devs/pymc#8414 · 3 comments · Opened Aug 28, 2026
ENH: Render full symbolic expressions for Deterministics (and Potentials) in model representations — plain text and LaTeX Open

Difficulty 4/5 3-5 days Newbie friendliness 65/100

pymc-devs/pymc#8407 · 1 comment · Opened Aug 25, 2026
BUG: No Progressbar in Marimo Notebook with ADVI Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 65/100

pymc-devs/pymc#8405 · 3 comments · Opened Aug 21, 2026
Support symbolic eta parameter in LKJCholeskyCov.logp Open

Difficulty 3/5 1-2 days Newbie friendliness 70/100

pymc-devs/pymc#8403 · Opened Aug 21, 2026
check_parameters should support xtensor inputs Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

pymc-devs/pymc#8398 · 1 comment · Opened Aug 13, 2026
BUG: default fork worker segfaults for MvNormal/LKJ sampling on macOS arm64 Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

pymc-devs/pymc#8377 · 1 comment · Opened Jul 24, 2026
pm.sample segfaults on Apple Silicon: fork default + Accelerate BLAS Open

bug macOS

Difficulty 4/5 3-5 days Newbie friendliness 48/100

pymc-devs/pymc#8372 · 1 comment · Opened Jul 20, 2026
BUG: `pm.sample(nuts_sampler="blackjax")` fails during warmup with every blackjax >= 1.6 Open

bug jax samplers

Difficulty 3/5 1-2 days Newbie friendliness 70/100

pymc-devs/pymc#8367 · 2 comments · Opened Jul 16, 2026
BUG: nuts vectorized chain method arg raising in pymc>=6 Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

pymc-devs/pymc#8366 · Opened Jul 16, 2026
BUG: JAX-backend fit leaves jax.Array in shared variable storage, breaking later numba-compiled functions (approx.sample) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

pymc-devs/pymc#8360 · 1 comment · Opened Jul 13, 2026
BUG: pm.fit(..., backend="jax") fails for every model: ADVI approximation parameters lack static shapes Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pymc-devs/pymc#8359 · 1 comment · Opened Jul 13, 2026
BUG: pm.sample can't disable init-value jitter for the external JAX samplers (numpyro/blackjax) Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 72/100

pymc-devs/pymc#8352 · 5 comments · Opened Jul 9, 2026
BUG: Long post-sampling compile times on large models with SMC sampler Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

pymc-devs/pymc#8347 · 1 comment · Opened Jul 2, 2026
Consider accepting observed in sample_posterior_prodective `freeze_vars` Open

request discussion samplers

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pymc-devs/pymc#8341 · Opened Jun 23, 2026
Raveled NUTS setup fails for scan model with length-one dimensioned vector RV Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 55/100

pymc-devs/pymc#8337 · 2 comments · Opened Jun 22, 2026
BUG: ZeroSumTransform jacobian shape breaks on model freeze Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pymc-devs/pymc#8335 · 8 comments · Opened Jun 21, 2026
BUG: keep_warning_stat argument in pm.sample does nothing Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 58/100

pymc-devs/pymc#8321 · 4 comments · 1 reaction · Opened Jun 4, 2026
pymc.dims does not impute missing (NaN) observed data Open

dims feature request

Difficulty 3/5 1-2 days Newbie friendliness 65/100

pymc-devs/pymc#8317 · 3 comments · Opened May 30, 2026
BUG: Typing results in spurious IDE warnings for distribution indexing. Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

pymc-devs/pymc#8306 · 6 comments · Opened May 19, 2026
Release notes: place maintenance before docs Open

Difficulty 2/5 1-3 hours Newbie friendliness 65/100

pymc-devs/pymc#8296 · 1 comment · Opened May 13, 2026
ENH: Support user callback with nutpie sampler Open

feature request

Difficulty 4/5 3-5 days Newbie friendliness 45/100

pymc-devs/pymc#8292 · 1 comment · 2 reactions · Opened May 12, 2026
BUG: gp.TP default prior is not a multivariate Student-t process Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

pymc-devs/pymc#8290 · 4 comments · Opened May 11, 2026
BUG: Discrete distributions silently cast float observed values to integers Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 58/100

pymc-devs/pymc#8282 · 6 comments · Opened May 8, 2026
Remove deprecated return_inference_data=False in sample Open

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

pymc-devs/pymc#8272 · Opened Apr 27, 2026
is `pmd.Distribution(..., observed=pmd.as_xtensor(data, dims=dims), dims=dims)` redundant? Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

pymc-devs/pymc#8270 · 6 comments · Opened Apr 26, 2026
XTensorVariable flagged in `_find_unallowed_rvs_in_graph` Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

pymc-devs/pymc#8269 · 1 comment · Opened Apr 26, 2026
Add Threat Model Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

pymc-devs/pymc#8266 · 1 comment · Opened Apr 24, 2026
Add an Incident Response Plan Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

pymc-devs/pymc#8265 · 1 comment · Opened Apr 24, 2026
Use Scalar op property for monotonic increasing / decreasing instead of redefining them. Open

beginner friendly hackathon logprob maintenance

Difficulty 3/5 1-2 days Newbie friendliness 52/100

pymc-devs/pymc#8259 · 10 comments · 1 reaction · Opened Apr 22, 2026
postprocessing_vectorize default does not match docs/warnings Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

pymc-devs/pymc#8238 · 2 comments · Opened Apr 2, 2026
vectorize_over_posterior crashes with pymc.dims (XTensorVariable) models Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

pymc-devs/pymc#8237 · 1 comment · Opened Mar 31, 2026
Remove patch for empty coords if arviz handles it Open

trace-backend

Difficulty 3/5 1-2 days Newbie friendliness 40/100

pymc-devs/pymc#8233 · Opened Mar 30, 2026
ENH: Help PyTensor on macOS detect SDK header layout Open

feature request

Difficulty 4/5 3-5 days Newbie friendliness 45/100

pymc-devs/pymc#8230 · 1 comment · Opened Mar 29, 2026
BUG: `vectorize_over_posterior` crashes with `AttributeError` on models using `ZeroSumNormal` Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

pymc-devs/pymc#8219 · 1 comment · Opened Mar 24, 2026
BUG: BaseHMC doesn't pass `dtype` to ‎`QuadPotentialDiagAdapt` Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

pymc-devs/pymc#8213 · 2 comments · Opened Mar 23, 2026
ENH: Add ZeroOneInflatedBeta (Port from brms) Open

feature request

Difficulty 4/5 3-5 days Newbie friendliness 45/100

pymc-devs/pymc#8190 · 3 comments · Opened Mar 14, 2026
BUG: freeze_dims_and_data breaks HalfStudentT logp when a dimension has size 1 Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

pymc-devs/pymc#8173 · 11 comments · Opened Mar 6, 2026
`TestPopulationSamplers` started failing in the CI Open

bug Github CI/CD help wanted

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pymc-devs/pymc#8169 · 2 comments · Opened Mar 5, 2026
BUG: Possible coefficient scaling mismatch in HSGPPeriodic prior (q_j^2 used as std) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

pymc-devs/pymc#8167 · 1 comment · Opened Mar 5, 2026
dims.Censored is not a regular RV Open

dims

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pymc-devs/pymc#8138 · 4 comments · Opened Feb 28, 2026
BUG: Instances of BaseHMCState are not __eq__ comparable Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 38/100

pymc-devs/pymc#8132 · 1 comment · Opened Feb 27, 2026
BUG: `gp.Latent.conditional` conditional cov needs stabilizing? Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 38/100

pymc-devs/pymc#8108 · 2 comments · Opened Feb 16, 2026
Deprecation warning from cachetools v7 Open

dependencies help wanted

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pymc-devs/pymc#8106 · 5 comments · Opened Feb 11, 2026
BUG: ZarrTrace unnecessarily loads all data into memory after sampling is done Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

pymc-devs/pymc#8104 · 2 comments · Opened Feb 10, 2026

pymc-devs/pymc

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