pymc-devs/pytensor

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PyTensor allows you to define, optimize, and efficiently evaluate mathematical expressions involving multi-dimensional arrays.

Stars: 644
Forks: 208
Open beginner issues: 4
Indexed issues: 341
Avg merge: 2d 14h
Merged PRs (30d): 16

Dominant language: Python
License: No license data
Last GitHub push: Sep 18, 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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14 beginner-friendly issues open

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
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
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
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
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
pt.tensor("x") without shape= gives misleading error — default implies optional when it isn't Open

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

pymc-devs/pytensor#2338 · 1 comment · Opened Aug 10, 2026
TensorType.shape is a mutable plain attribute Open

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

pymc-devs/pytensor#2330 · 3 comments · Opened Aug 9, 2026
XTensorType.dims and .shape are silently mutable, leaving ndim out of sync Open

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

pymc-devs/pytensor#2329 · 1 comment · Opened Aug 9, 2026
DOC: Add pre-commit commands to CONTRIBUTING.md Open

Difficulty 1/5 Under an hour Newbie friendliness 86/100

pymc-devs/pytensor#2215 · 1 comment · Opened Jun 11, 2026
DOC: include description for the section with vectorize Open

docs

Difficulty 1/5 Under an hour Newbie friendliness 68/100

pymc-devs/pytensor#2183 · 1 comment · Opened May 28, 2026
DOC: add citation files Open

docs

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

pymc-devs/pytensor#2119 · 1 comment · 1 reaction · Opened May 9, 2026
DOC: document f.trust_input=True as MLX hot-loop performance tip Open

docs mlx

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

pymc-devs/pytensor#2093 · Opened Apr 28, 2026
PERF: TensorType.filter is O(N) for foreign array types (mx.array, jax.Array, torch.Tensor) Open

backend compatibility enhancement jax mlx

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

pymc-devs/pytensor#2087 · Opened Apr 28, 2026
CDataTypeConstant.signature() is wrong, merge_signature override shouldn't be needed Open

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

pymc-devs/pytensor#2031 · Opened Apr 6, 2026

pymc-devs/pytensor

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