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pyhf: pure-Python implementation of HistFactory with tensors and automatic differentiation

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arxiv 2211.15838 v1 pith:3RWTMU4R submitted 2022-11-29 hep-ex hep-ph

pyhf: pure-Python implementation of HistFactory with tensors and automatic differentiation

classification hep-ex hep-ph
keywords pyhfhistfactoryimplementationanalysisasymptoticmodelspure-pythonroot
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The HistFactory p.d.f. template is per-se independent of its implementation in ROOT and it is useful to be able to run statistical analysis outside of the ROOT, RooFit, RooStats framework. pyhf is a pure-Python implementation of that statistical model for multi-bin histogram-based analysis and its interval estimation is based on the asymptotic formulas of "Asymptotic formulae for likelihood-based tests of new physics". pyhf supports modern computational graph libraries such as TensorFlow, PyTorch, and JAX in order to make use of features such as auto-differentiation and GPU acceleration. In addition, pyhf's JSON serialization specification for HistFactory models has been used to publish 23 full probability models from published ATLAS collaboration analyses to HEPData.

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