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pymc-devs

13 indexed repositories · View on GitHub

pymc
Bayesian Modeling and Probabilistic Programming in Python

Python · 9759 stars
pytensor
PyTensor allows you to define, optimize, and efficiently evaluate mathematical expressions involving multi-dimensional arrays.

Python · 644 stars
pymc-examples
Examples of PyMC models, including a library of Jupyter notebooks.

Python · 398 stars
nutpie
Python wrapper for nuts-rs

Python · 207 stars
pymc-bart

Python · 156 stars
pymc-extras
Powerful add-ons for PyMC

Jupyter Notebook · 143 stars
nuts-rs
A implementation of NUTS in rust

Rust · 109 stars
pytensor-ml
Neural Network package built on Pytensor

Python · 9 stars
bartrs
High-performance Rust-based particle Gibbs sampler for Bayesian additive regression trees

Rust · 8 stars
ptgp
GPs in PyTensor

Jupyter Notebook · 8 stars
pymc-model-catalogue

Python · 6 stars
pytensor-distributions
PyTensor powered distributions

Python · 5 stars
pymc-prop

Python · 4 stars

Beginner friendly Everything

Open All

scaled_dot_product_attention promotes float32 inputs to float64 (uses config.floatX for the scale and causal mask) Open

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

pymc-devs/pytensor-ml#164 · Opened Sep 19, 2026
Numba linker: fgraph_to_python puts fgraph inputs in global_env, preventing numba caching Open

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

pymc-devs/pytensor#2428 · 1 comment · Opened Sep 18, 2026
Feature request: backend-dispatch registration hook for third-party packages Open

Difficulty 5/5 Over a week Newbie friendliness 45/100

pymc-devs/pytensor#2427 · 4 comments · Opened Sep 18, 2026
Make Sort/ArgSort axis a static Op property Open

enhancement refactor

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

pymc-devs/pytensor#2426 · Opened Sep 18, 2026
MLX: Subtensor and IncSubtensor fail on a symbolic integer index under mx.compile Open

bug indexing mlx

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

pymc-devs/pytensor#2422 · Opened Sep 17, 2026
Give compile_training_step's shared parameters a static shape for JAX and MLX Open

enhancement pytensor

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

pymc-devs/ptgp#54 · 1 comment · Opened Sep 16, 2026
Numba MvNormalRV raises LinAlgError on a NaN covariance: np.linalg calls inside the njit body Open

enhancement linalg numba

Difficulty 3/5 1-2 days Newbie friendliness 84/100

pymc-devs/pytensor#2421 · Opened Sep 16, 2026
control scale of initialization randomness Open

Difficulty 3/5 1-2 days Newbie friendliness 64/100

pymc-devs/nutpie#352 · 1 comment · Opened Sep 15, 2026
(un)constrained initialization for Stan (and PyMC?) Open

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

pymc-devs/nutpie#351 · 1 comment · Opened Sep 15, 2026
init_mean passed, but never used Open

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

pymc-devs/nutpie#350 · Opened Sep 15, 2026
`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
Blockwise of an OpFromGraph core keeps the inner graph's unknown static shape Open

OpFromGraph shape inference vectorization

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

pymc-devs/pytensor#2419 · 6 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
local_useless_unbatched_blockwise emits squeeze(expand_dims(x)) that nothing collapses, so factorizations stop merging Open

graph rewriting performance vectorization

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

pymc-devs/pytensor#2416 · 2 comments · Opened Sep 14, 2026
psd_solve_to_chol_solve only tracks b_ndim=2, so solve(A, b, assume_a="pos") with a vector b factors A twice Open

graph rewriting linalg performance

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

pymc-devs/pytensor#2415 · 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
Make the PyMC/Numba frontend usable without _lib for WASM integration Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

pymc-devs/nutpie#347 · Opened Sep 11, 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
feat: support the pymc.dims (xdist) API Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

pymc-devs/pymc-bart#289 · Opened Sep 9, 2026
Prior.create_likelihood_variable detaches tensor parameters, so pm.set_data stops reaching the likelihood Open

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

pymc-devs/pymc-extras#764 · 1 comment · Opened Sep 8, 2026
BUG: ImportError: cannot import name 'batched_dot' from 'pytensor.tensor.blas' Open

bug

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

pymc-devs/pytensor#2407 · 3 comments · Opened Sep 7, 2026
Trainer.fit reads len(data) as the dataset size, so minibatch likelihoods get the wrong scale Open

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

pymc-devs/pymc-extras#758 · Opened Sep 3, 2026
BUG: TypingError using pt.tensor.linalg.eig within a pymc model Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 52/100

pymc-devs/nutpie#344 · 3 comments · Opened Sep 1, 2026
ENH: Introduce a callbacks mechanism to the Trainer class Open

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

pymc-devs/pymc-extras#755 · Opened Aug 29, 2026
Move optimizers to pytensor-ml Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pymc-devs/pymc-extras#754 · 2 comments · Opened Aug 29, 2026
Move the _is_provably_positive helpers out of tensor/subtensor.py Open

maintenance refactor

Difficulty 4/5 3-5 days Newbie friendliness 50/100

pymc-devs/pytensor#2404 · Opened Aug 28, 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
Guard the MLX convolution's rank at compile time Open

enhancement pytensor

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

pymc-devs/pytensor-ml#135 · 1 comment · Opened Aug 28, 2026
Add a batch_first argument to MultiheadAttention Open

enhancement layer

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

pymc-devs/pytensor-ml#127 · 1 comment · Opened Aug 28, 2026
require_unique_state_names misses a duplicate name that is only read Open

enhancement optimizer

Difficulty 4/5 3-5 days Newbie friendliness 72/100

pymc-devs/pytensor-ml#122 · 1 comment · Opened Aug 28, 2026
JAX aligns the causal mask top-left, so generation with a KV cache attends to the wrong prefix Open

bug layer

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

pymc-devs/pytensor-ml#120 · Opened Aug 28, 2026
test_mlx_eigh compares eigenvector signs, which are arbitrary Open

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

pymc-devs/pytensor#2394 · Opened Aug 26, 2026
MLX: gradient of batched advanced indexing fails in broadcast_shapes Open

bug gradients indexing mlx

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

pymc-devs/pytensor#2387 · 1 comment · Opened Aug 26, 2026
Consider `mlx-addons` for MLX linalg dispatches Open

enhancement help wanted linalg mlx

Difficulty 5/5 Over a week Newbie friendliness 30/100

pymc-devs/pytensor#2383 · 4 comments · 1 reaction · Opened Aug 26, 2026
Hessian in find_MAP/fit_laplace/fit_dadvi is a Scan; expose a vectorize flag Open

feature request inference

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

pymc-devs/pymc-extras#752 · Opened Aug 25, 2026
MLX AdvancedIncSubtensor fails when Blockwise adds a batch dim Open

backend compatibility bug mlx

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

pymc-devs/pytensor#2382 · Opened Aug 25, 2026
Update find_MAP's return type annotation to DataTree Open

Difficulty 1/5 Under an hour Newbie friendliness 90/100

pymc-devs/pymc-extras#751 · Opened Aug 25, 2026
Type mismatch in raw logp return Open

Difficulty 1/5 Under an hour Newbie friendliness 88/100

pymc-devs/nutpie#343 · Opened Aug 25, 2026
ENH: Expose a 'stop at named variables' mode in `pprint` and add LaTeX printers Open

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

pymc-devs/pytensor#2381 · 2 comments · Opened Aug 25, 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
Test groups have drifted out of balance, so CI wall clock is 8 minutes Open

enhancement

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

pymc-devs/pytensor-ml#109 · Opened Aug 24, 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
numba max reduction is 10x slower than sum on the same array Open

numba performance

Difficulty 4/5 3-5 days Newbie friendliness 50/100

pymc-devs/pytensor#2367 · 2 comments · Opened Aug 20, 2026
pt.flatten drops static shape on a fully-known input Open

bug shape inference

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

pymc-devs/pytensor#2366 · 3 comments · Opened Aug 20, 2026
PyTorch backend warns on every read-only constant: torch.as_tensor on non-writable array Open

bug torch

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

pymc-devs/pytensor#2365 · 1 comment · Opened Aug 20, 2026
scan_push_out_seq doesn't push a sequence-dependent Blockwise out of the loop Open

enhancement graph rewriting performance scan

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

pymc-devs/pytensor#2357 · 1 comment · Opened Aug 16, 2026
Out-of-core minibatch ADVI on a financial tick stream Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

pymc-devs/pymc-examples#891 · Opened Aug 14, 2026

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