scikit-hep/pyhf

View on GitHub

pure-Python HistFactory implementation with tensors and autodiff

Stars: 303
Forks: 102
Open beginner issues: 0
Indexed issues: 398
Avg merge: 12h 39m
Merged PRs (30d): 17

Dominant language: Python
License: Apache-2.0
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 good first issue

Beginner friendly Everything

Open All

398 open issues indexed

Release v0.8.0 checklist Open

scikit-hep/pyhf#2768 · 1 assignee · Opened Sep 14, 2026
SCHEMA_CACHE lookup key never matches: Path() collapses double slash in schema URL Open

bug

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

scikit-hep/pyhf#2749 · Opened Aug 14, 2026
Add tests on self-hosted GPU runners Open

scikit-hep/pyhf#2733 · 1 assignee · Opened Jul 24, 2026
interpolation code2 is deliberately discontinuous Open

bug needs-triage

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

scikit-hep/pyhf#2729 · Opened Jul 7, 2026
pyhf review from Claude Fable Open

scikit-hep/pyhf#2706 · 2 comments · 1 reaction · 2 assignees · Opened Jun 12, 2026
outdated notebooks Open

docs needs-triage

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

scikit-hep/pyhf#2689 · Opened Apr 4, 2026
Release v0.8.0 burn down tracker Open

scikit-hep/pyhf#2681 · 2 assignees · Opened Apr 2, 2026
Only load the necesssary backends when testing with `skip_backend` or `only_backend` markers Open

feat/enhancement good first issue help wanted tests

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

scikit-hep/pyhf#2654 · 3 comments · Opened Dec 24, 2025
Drop support for Python 3.9 to maintain testing consistency Open

Breaking build

scikit-hep/pyhf#2653 · 1 assignee · Opened Dec 24, 2025
Improve speed of Click autocompletions Open

CLI help wanted perf

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

scikit-hep/pyhf#2649 · Opened Dec 18, 2025
Add Scientific Python repo review checks to CI Open

CI style

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

scikit-hep/pyhf#2624 · 2 comments · Opened Oct 16, 2025
Click v8.2.X breaks docs build with unexpected keyword argument 'ctx' Open

bug docs

Difficulty 3/5 1-2 days Newbie friendliness 50/100

scikit-hep/pyhf#2614 · 2 comments · Opened Oct 14, 2025
Multiple correlated modifiers acting on same distribution result in silent skipping Open

bug needs-triage

scikit-hep/pyhf#2602 · 2 assignees · Opened Sep 8, 2025
Pyhf giving inconsistent results depending on machine, with identical setups Open

bug needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 30/100

scikit-hep/pyhf#2601 · 1 comment · 1 reaction · Opened Sep 6, 2025
Linkcheck for docs is failing Open

bug docs

scikit-hep/pyhf#2594 · 2 assignees · Opened Jul 18, 2025
Support for unbound parameters Open

feat/enhancement needs-triage

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

scikit-hep/pyhf#2585 · 4 comments · 1 reaction · Opened Apr 11, 2025
Inconsistency between `main` branch and tagged release treatment of default POI name Open

bug needs-triage

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

scikit-hep/pyhf#2583 · Opened Apr 7, 2025
autogenerate documentation from json schema Open

feat/enhancement needs-triage

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

scikit-hep/pyhf#2582 · 1 reaction · Opened Apr 3, 2025
Staterror on samples with negative bin counts Open

bug needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 25/100

scikit-hep/pyhf#2577 · 1 comment · Opened Mar 12, 2025
Typing for model config properties Open

feat/enhancement needs-triage type checking

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

scikit-hep/pyhf#2576 · Opened Mar 11, 2025
chore: migrate from `make linkcheck` and `make html` to `sphinx-build -M` Open

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

scikit-hep/pyhf#2571 · 1 comment · Opened Jan 22, 2025
hist2workspace regression (or change) Open

bug needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 25/100

scikit-hep/pyhf#2570 · 10 comments · Opened Jan 22, 2025
repeated staterror across channels Open

bug needs-triage

Difficulty 3/5 1-2 days Newbie friendliness 42/100

scikit-hep/pyhf#2565 · 2 comments · Opened Dec 13, 2024
repeated modifiers Open

bug needs-triage user request

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

scikit-hep/pyhf#2558 · 2 comments · Opened Nov 14, 2024
support for custom test statistics Open

experiment/belle2 feat/enhancement needs-triage

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

scikit-hep/pyhf#2551 · Opened Oct 20, 2024
Improve error messages/hints when "Estimated distance to minimum too large." Open

feat/enhancement needs-triage

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

scikit-hep/pyhf#2529 · 3 comments · Opened Jul 5, 2024
Warn when parameter hits bounds Open

feat/enhancement optimization

scikit-hep/pyhf#2525 · 3 comments · 1 assignee · Opened Jun 26, 2024
xml2json breaks with HistoPath including filename Open

bug schema and spec

scikit-hep/pyhf#2487 · 2 comments · 1 assignee · Opened May 27, 2024
toms748_scan doesn't work with JAX backend Open

bug

scikit-hep/pyhf#2466 · 6 comments · 1 assignee · Opened Apr 13, 2024
Treating arbitrarily correlated parameters with pyhf Open

experiment/belle2 feat/enhancement needs-triage

Difficulty 5/5 Over a week Newbie friendliness 18/100

scikit-hep/pyhf#2463 · 3 comments · Opened Mar 27, 2024
Inconsistent return types of `model.config.suggested_bounds()` when using parameter config Open

bug needs-triage user request

scikit-hep/pyhf#2462 · 1 reaction · 1 assignee · Opened Mar 24, 2024
Forced measurement object schema validation through `ws.model()` Open

bug

scikit-hep/pyhf#2457 · 1 comment · 1 reaction · 1 assignee · Opened Mar 15, 2024
docs linkcheck failing for SciPy conference proceedings Open

bug docs

scikit-hep/pyhf#2450 · 1 assignee · Opened Mar 10, 2024
Implementation of fixed params in scipy minimizer Open

feat/enhancement needs-triage

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

scikit-hep/pyhf#2439 · Opened Jan 11, 2024
Typo in docs for qmutilde test-statistic Open

Difficulty 1/5 Under an hour Newbie friendliness 45/100

scikit-hep/pyhf#2438 · 1 comment · Opened Jan 11, 2024
Using the hessian matrix in optimization Open

feat/enhancement needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 42/100

scikit-hep/pyhf#2437 · 2 comments · Opened Jan 10, 2024
Release v0.7.6 checklist Open

docs

scikit-hep/pyhf#2429 · 1 assignee · Opened Jan 5, 2024
Typing for tensor shapes Open

feat/enhancement needs-triage user request

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

scikit-hep/pyhf#2402 · 1 reaction · Opened Dec 18, 2023
Remove `InvalidNameReuse` exception in favor of in `InvalidModel` Open

API help wanted

Difficulty 2/5 1-3 hours Newbie friendliness 42/100

scikit-hep/pyhf#2395 · Opened Dec 8, 2023
Catch 100% normalization uncertainty modifiers Open

feat/enhancement needs-triage user request

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

scikit-hep/pyhf#2379 · 1 reaction · Opened Nov 15, 2023
Pruning with logical "and" instead of "or" Open

feat/enhancement needs-triage

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

scikit-hep/pyhf#2374 · 2 comments · Opened Oct 31, 2023
Release v0.7.5 checklist Open

docs

scikit-hep/pyhf#2366 · 1 assignee · Opened Oct 26, 2023
Make tests/test_scripts.py that use pytest-console-scripts script_runner fixture OS independent Open

help wanted tests Windows

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

scikit-hep/pyhf#2365 · 1 comment · Opened Oct 26, 2023
Construction of qmutilde for muhat < 0 Open

bug user request

Difficulty 4/5 3-5 days Newbie friendliness 25/100

scikit-hep/pyhf#2352 · 6 comments · Opened Oct 16, 2023
Allow for disabling the default backend in tests at the command line Open

tests

scikit-hep/pyhf#2346 · 1 assignee · Opened Oct 9, 2023
Document / summarize additional tools in the "family" / network Open

docs

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

scikit-hep/pyhf#2338 · Opened Sep 20, 2023
Release v0.7.4 checklist Open

docs

scikit-hep/pyhf#2319 · 2 comments · 1 assignee · Opened Sep 6, 2023
Analytic optimization of staterror parameters Open

feat/enhancement needs-triage

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

scikit-hep/pyhf#2304 · 2 comments · 1 reaction · Opened Aug 24, 2023
Release v0.7.3 checklist Open

docs

scikit-hep/pyhf#2289 · 2 comments · 1 assignee · Opened Aug 16, 2023
Add learn notebook on the CLs method Open

docs

scikit-hep/pyhf#2274 · 1 assignee · Opened Aug 10, 2023

scikit-hep/pyhf

Get new issues in your inbox