Source code for pyhf.infer.utils

"""Inference for Statistical Models."""

from pyhf.infer.calculators import AsymptoticCalculator, ToyCalculator
from pyhf.exceptions import InvalidTestStatistic
from pyhf.infer.test_statistics import q0, qmu, qmu_tilde

import logging

log = logging.getLogger(__name__)

__all__ = ["create_calculator", "get_test_stat"]

def __dir__():
    return __all__

[docs]def all_pois_floating(pdf, fixed_params): r""" Check whether all POI(s) are floating (i.e. not within the fixed set). Args: pdf (~pyhf.pdf.Model): The statistical model adhering to the schema ``model.json``. fixed_params (:obj:`list` or `tensor` of :obj:`bool`): Array of :obj:`bool` indicating if model parameters are fixed. Returns: :obj:`bool`: The result whether all POIs are floating. """ poi_fixed = fixed_params[pdf.config.poi_index] return not poi_fixed
[docs]def create_calculator(calctype, *args, **kwargs): """ Creates a calculator object of the specified `calctype`. See :py:class:`~pyhf.infer.calculators.AsymptoticCalculator` and :py:class:`~pyhf.infer.calculators.ToyCalculator` on additional arguments to be specified. Example: >>> import pyhf >>> import numpy.random as random >>> random.seed(0) >>> model = pyhf.simplemodels.uncorrelated_background( ... signal=[12.0, 11.0], bkg=[50.0, 52.0], bkg_uncertainty=[3.0, 7.0], ... ) >>> observations = [51, 48] >>> data = observations + model.config.auxdata >>> mu_test = 1.0 >>> toy_calculator = pyhf.infer.utils.create_calculator( ... "toybased", data, model, ntoys=100, test_stat="qtilde", track_progress=False ... ) >>> qmu_sig, qmu_bkg = toy_calculator.distributions(mu_test) >>> qmu_sig.pvalue(mu_test), qmu_bkg.pvalue(mu_test) (array(0.14), array(0.79)) Args: calctype (:obj:`str`): The calculator to create. Choose either 'asymptotics' or 'toybased'. Returns: calculator (:obj:`object`): A calculator. """ return {'asymptotics': AsymptoticCalculator, 'toybased': ToyCalculator}[calctype]( *args, **kwargs )
[docs]def get_test_stat(name): """ Get the test statistic function by name. The following test statistics are supported: - :func:`~pyhf.infer.test_statistics.q0` - :func:`~pyhf.infer.test_statistics.qmu` - :func:`~pyhf.infer.test_statistics.qmu_tilde` Example: >>> from pyhf.infer import utils, test_statistics >>> utils.get_test_stat("q0") <function q0 at 0x...> >>> utils.get_test_stat("q0") == test_statistics.q0 True >>> utils.get_test_stat("q") <function qmu at 0x...> >>> utils.get_test_stat("q") == test_statistics.qmu True >>> utils.get_test_stat("qtilde") <function qmu_tilde at 0x...> >>> utils.get_test_stat("qtilde") == test_statistics.qmu_tilde True Args: name (:obj:`str`): The name of the test statistic to retrieve Returns: callable: The test statistic function """ _mapping = { "q0": q0, "q": qmu, "qtilde": qmu_tilde, } try: return _mapping[name] except KeyError: raise InvalidTestStatistic