import logging
import pyhf
from pyhf import events, interpolators
from pyhf.exceptions import InvalidModifier
from pyhf.parameters import ParamViewer
from pyhf.tensor.manager import get_backend
log = logging.getLogger(__name__)
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def required_parset(_sample_data, _modifier_data):
return {
"paramset_type": "constrained_by_normal",
"n_parameters": 1,
"is_scalar": True,
"inits": (0.0,),
"bounds": ((-5.0, 5.0),),
"fixed": False,
"auxdata": (0.0,),
}
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class histosys_builder:
"""Builder class for collecting histoys modifier data"""
is_shared = True
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def __init__(self, config):
self.builder_data = {}
self.config = config
self.required_parsets = {}
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def collect(self, thismod, nom):
lo_data = thismod["data"]["lo_data"] if thismod else nom
hi_data = thismod["data"]["hi_data"] if thismod else nom
maskval = bool(thismod)
mask = [maskval] * len(nom)
return {"lo_data": lo_data, "hi_data": hi_data, "mask": mask, "nom_data": nom}
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def append(self, key, channel, sample, thismod, defined_samp):
self.builder_data.setdefault(key, {}).setdefault(sample, {}).setdefault(
"data", {"hi_data": [], "lo_data": [], "nom_data": [], "mask": []}
)
nom = (
defined_samp["data"]
if defined_samp
else [0.0] * self.config.channel_nbins[channel]
)
moddata = self.collect(thismod, nom)
self.builder_data[key][sample]["data"]["lo_data"].append(moddata["lo_data"])
self.builder_data[key][sample]["data"]["hi_data"].append(moddata["hi_data"])
self.builder_data[key][sample]["data"]["nom_data"].append(moddata["nom_data"])
self.builder_data[key][sample]["data"]["mask"].append(moddata["mask"])
if thismod:
self.required_parsets.setdefault(
thismod["name"],
[required_parset(defined_samp["data"], thismod["data"])],
)
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def finalize(self):
default_backend = pyhf.default_backend
for modifier_name, modifier in self.builder_data.items():
for sample_name, sample in modifier.items():
sample["data"]["mask"] = default_backend.concatenate(
sample["data"]["mask"]
)
sample["data"]["lo_data"] = default_backend.concatenate(
sample["data"]["lo_data"]
)
sample["data"]["hi_data"] = default_backend.concatenate(
sample["data"]["hi_data"]
)
sample["data"]["nom_data"] = default_backend.concatenate(
sample["data"]["nom_data"]
)
if (
not len(sample["data"]["nom_data"])
== len(sample["data"]["lo_data"])
== len(sample["data"]["hi_data"])
):
_modifier_type, _modifier_name = modifier_name.split("/")
_sample_data_len = len(sample["data"]["nom_data"])
_lo_data_len = len(sample["data"]["lo_data"])
_hi_data_len = len(sample["data"]["hi_data"])
msg = (
f"The '{sample_name}' sample {_modifier_type} modifier"
f" '{_modifier_name}' has data shape inconsistent with the sample.\n"
f"{sample_name} has 'data' of length {_sample_data_len} but {_modifier_name}"
f" has 'lo_data' of length {_lo_data_len} and 'hi_data' of length {_hi_data_len}."
)
raise InvalidModifier(msg)
return self.builder_data
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class histosys_combined:
name = "histosys"
op_code = "addition"
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def __init__(
self, modifiers, pdfconfig, builder_data, interpcode="code0", batch_size=None
):
self.batch_size = batch_size
self.interpcode = interpcode
assert self.interpcode in ["code0", "code2", "code4p"]
keys = [f"{mtype}/{m}" for m, mtype in modifiers]
histosys_mods = [m for m, _ in modifiers]
parfield_shape = (
(self.batch_size, pdfconfig.npars)
if self.batch_size
else (pdfconfig.npars,)
)
self.param_viewer = ParamViewer(
parfield_shape, pdfconfig.par_map, histosys_mods
)
self._histosys_histoset = [
[
[
builder_data[m][s]["data"]["lo_data"],
builder_data[m][s]["data"]["nom_data"],
builder_data[m][s]["data"]["hi_data"],
]
for s in pdfconfig.samples
]
for m in keys
]
self._histosys_mask = [
[[builder_data[m][s]["data"]["mask"]] for s in pdfconfig.samples]
for m in keys
]
if histosys_mods:
self.interpolator = getattr(interpolators, self.interpcode)(
self._histosys_histoset
)
self._precompute()
events.subscribe("tensorlib_changed")(self._precompute)
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def _precompute(self):
if not self.param_viewer.index_selection:
return
tensorlib, _ = get_backend()
self.histosys_mask = tensorlib.astensor(self._histosys_mask, dtype="bool")
self.histosys_default = tensorlib.zeros(self.histosys_mask.shape)
if self.batch_size is None:
self.indices = tensorlib.reshape(
self.param_viewer.indices_concatenated, (-1, 1)
)
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def apply(self, pars):
"""
Returns:
modification tensor: Shape (n_modifiers, n_global_samples, n_alphas, n_global_bin)
"""
if not self.param_viewer.index_selection:
return None
tensorlib, _ = get_backend()
if self.batch_size is None:
histosys_alphaset = self.param_viewer.get(pars, self.indices)
else:
histosys_alphaset = self.param_viewer.get(pars)
results_histo = self.interpolator(histosys_alphaset)
# either rely on numerical no-op or force with line below
return tensorlib.where(self.histosys_mask, results_histo, self.histosys_default)