def test_simfactory_factory_split(sim_factory):
"""Test function splitting is done properly."""
# With yields
syst_fac = ToyRandomizer(sim_factory)
assert list(syst_fac._gen_pdfs.keys()) == ['label1', 'label2']
assert len(syst_fac._gen_pdfs['label1']) == 2
assert syst_fac._gen_pdfs['label1'][0].expectedEvents(
list_to_rooargset(
sim_factory.get_observables())) == 999
assert syst_fac._gen_pdfs['label1'][1].expectedEvents(
list_to_rooargset(
sim_factory.get_observables())) == 320
assert len(syst_fac._gen_pdfs['label2']) == 1
assert syst_fac._gen_pdfs['label2'][0].expectedEvents(
list_to_rooargset(
sim_factory.get_observables())) == 231
def get_constraints(self):
child_constraints = list_to_rooargset(self._constraints)
for child in self.get_children().values():
tmp_constraints = child.get_constraints()
if tmp_constraints:
child_constraints = ROOT.RooArgSet(child_constraints,
child.get_constraints())
return child_constraints
def test_prodfactory_split(prod_factory):
"""Test function splitting is done properly."""
syst_fac = ToyRandomizer(prod_factory)
assert list(syst_fac._gen_pdfs.keys()) == [None]
assert len(syst_fac._gen_pdfs[None]) == 1
assert syst_fac._gen_pdfs[None][0].expectedEvents(
list_to_rooargset(
prod_factory.get_observables())) == 999
def test_sumfactory_factory_split(sum_factory, sum_factory_frac):
"""Test function splitting is done properly."""
# With yields
syst_fac = ToyRandomizer(sum_factory)
assert list(syst_fac._gen_pdfs.keys()) == [None]
assert len(syst_fac._gen_pdfs[None]) == 2
assert syst_fac._gen_pdfs[None][0].expectedEvents(
list_to_rooargset(
sum_factory.get_observables())) == 999
assert syst_fac._gen_pdfs[None][1].expectedEvents(
list_to_rooargset(
sum_factory.get_observables())) == 999
# With fraction
syst_fac = ToyRandomizer(sum_factory_frac, {'yield': 100})
assert list(syst_fac._gen_pdfs.keys()) == [None]
assert len(syst_fac._gen_pdfs[None]) == 1
assert syst_fac._gen_pdfs[None][0].expectedEvents(
list_to_rooargset(
sum_factory.get_observables())) == 100
def get_dataset(self, randomize=True):
"""Get dataset generated from the input model.
If an acceptance was given on initialization, accept-reject is applied on the dataset,
and an extra variable representing the inverse of the per-event weight (`fit_weight`)
is added as weight.
Arguments:
randomize (bool, optional): Randomize the parameters? Defaults to `True`.
Return:
`ROOT.RooDataSet`.
"""
import ROOT
# TODO: Add weights?
if randomize:
logger.debug("Applying randomization")
self.randomize()
obs = list_to_rooargset(self._model.get_observables())
datasets_to_merge = []
cats = list_to_rooarglist(self._model.get_category_vars())
for label, pdf_list in self._gen_pdfs.items():
if cats:
for lab_num, lab in enumerate(label.split(',')):
cats[lab_num].setLabel(lab)
for pdf in pdf_list:
logger.debug("Generating PDF -> %s", pdf.GetName())
if self._gen_acceptance:
# TODO: Fixed yields
yield_to_generate = poisson.rvs(pdf.expectedEvents(obs))
pandas_dataset = None
while yield_to_generate:
events = self._gen_acceptance.apply_accept_reject(
pandas_from_dataset(
pdf.generate(obs, yield_to_generate * 2)))
# Sample if the dataset is too large
if events.shape[0] > yield_to_generate:
events = events.sample(yield_to_generate)
# Merge with existing
if not pandas_dataset:
pandas_dataset = events
else:
pandas_dataset = pandas_dataset.append(events, ignore_index=True)
yield_to_generate -= len(events)
logger.debug("Adding fitting weights")
pandas_dataset['fit_weight'] = self._fit_acceptance.get_fit_weights(pandas_dataset)
dataset = dataset_from_pandas(pandas_dataset, "GenData", "GenData", weight_var='fit_weight')
else:
dataset = pdf.generate(obs, ROOT.RooFit.Extended(True))
if cats:
dataset.addColumns(cats)
datasets_to_merge.append(dataset)
return merge_root(datasets_to_merge, 'GenData', 'GenData')
def test_factory_split(factory, factory_with_yield):
"""Test function splitting is done properly."""
try:
ToyRandomizer(factory)
except ValueError:
pass
# Manual yield
syst_fac = ToyRandomizer(factory, {'yield': 100})
assert list(syst_fac._gen_pdfs.keys()) == [None]
assert len(syst_fac._gen_pdfs[None]) == 1
assert syst_fac._gen_pdfs[None][0].expectedEvents(
list_to_rooargset(
factory.get_observables())) == 100
# Yield from config
syst_fac = ToyRandomizer(factory_with_yield)
assert list(syst_fac._gen_pdfs.keys()) == [None]
assert len(syst_fac._gen_pdfs[None]) == 1
assert syst_fac._gen_pdfs[None][0].expectedEvents(
list_to_rooargset(
factory.get_observables())) == 1000
def __init__(self, factories, children_yields, parameters=None):
"""Initialize.
In this case, the children are a map of PDF name -> Factory.
Raise:
InvalidRequestError: When the observables of the factories are incompatible.
KeyError: On configuration error.
"""
# Check observable compatibility
if len({
tuple([obs.GetName() for obs in factory.get_observables()])
for factory in factories.values()
}) != 1:
raise InvalidRequestError("Incompatible observables")
# Check children yields type
if not isinstance(children_yields, OrderedDict):
raise ValueError("children_yields must be an ordered dictionary")
super(SumPhysicsFactory, self).__init__({}, parameters)
# Set children
self._children = factories
# Set observables
observables = {
obs.getStringAttribute('originalName'): obs
for obs in list(self._children.values())[0].get_observables()
}
for obs_name, obs in observables.items():
for child in list(self._children.values())[1:]:
child.set_observable(obs_name, obs=obs)
# Set yields
yield_ = None
if parameters and 'yield' in parameters:
yield_, constraint = parameters.pop('yield')
yield_values = [
child_yield for child_yield, _ in children_yields.values()
]
if len(factories) == len(children_yields): # Extended
if yield_ is not None:
raise KeyError("Specified yield on a sum of RooExtendPdf")
self['Yield'] = ROOT.RooAddition("Yield", "Yield",
list_to_rooarglist(yield_values))
self._constraints.update(
{constraint
for _, constraint in children_yields.values()})
for child_name, child in self._children.items():
child.set_yield_var(children_yields[child_name])
elif (len(factories) - len(children_yields)) == 1:
# Check order is correct
if list(self._children.keys())[-1] in children_yields.keys():
logger.error(
"The last child should not be in `children_keys` to ensure consistency."
)
raise ValueError("Wrong PDF ordering")
# Store the fractions and propagate
for yield_val in yield_values:
if yield_val.getVal() > 1:
raise ValueError(
"Specified a fraction larger than 1 -> {}".format(
yield_val.GetName()))
# Not very good heuristics
if yield_val.getStringAttribute('shared') != 'true':
yield_val.SetName(yield_val.GetName().replace(
'Yield', 'Fraction'))
yield_val.SetTitle(yield_val.GetTitle().replace(
'Yield', 'Fraction'))
self['Fractions'] = yield_values
for child_name, child in self._children.items():
if child_name in children_yields:
child_yield, child_constraint = children_yields[child_name]
child['Fraction'] = child_yield
child._constraints.add(child_constraint)
else:
# Need no rename because RooFracRemainder needs a RooArgSet and there will be clashes
# between vars named 'Fraction'. It's stupid, since the name is not used after.
for yield_num, yield_val in enumerate(yield_values):
yield_val.SetName('{}_{}'.format(
yield_val.GetName(), yield_num))
child['Fraction'] = ROOT.RooFracRemainder(
"Fraction", "Fraction",
list_to_rooargset(yield_values))
child._constraints.update({
constraint
for _, constraint in children_yields.values()
if constraint
})
# Put names back where they belong
for yield_num, yield_val in enumerate(yield_values):
yield_val.SetName('_'.join(
yield_val.GetName().split('_')[:-1]))
# Final rename
if yield_ is not None:
self.set_yield_var((yield_, constraint))
else:
raise KeyError("Badly specified yields/fractions")
def dataset_from_pandas(frame, name, title, var_list=None, weight_var=None, categories=None, ranges=None):
"""Build RooDataset from a Pandas DataFrame.
Arguments:
frame (pandas.DataFrame): DataFrame to convert.
name (str): RooDataSet name.
title (str): RooDataSet title.
var_list (list[str], optional): List of variables to add to the dataset.
If not given, all variables are converted.
weight_var (str, optional): Assign the given variable name as weight.
Defaults to None.
categories (list[`ROOT.RooCategory`], optional): Categories to separate the data in.
Their name must correspond to a column in the `frame`.
ranges (dict, optional): Variables to set a range for. Defaults to `None`, in which case
all variables are unbounded.
Return:
ROOT.RooDataSet: Frame converted to dataset.
Raise:
KeyError: If the weight_var or the category is not present in `frame`.
"""
def fill_dataset(name, title, var_set, input_data):
"""Fill a dataset from a pandas DataFrame.
Arguments:
name (str): Name of the dataset.
title (str): Title of the dataset.
var_set (ROOT.RooArgSet): Variables in the dataset.
input_data (pandas.DataFrame): Input data.
Return:
ROOT.RooDataSet: Output data set.
"""
dataset = ROOT.RooDataSet(name, title, var_set)
for _, row in input_data.iterrows():
for var_name in var_names:
if isinstance(row[var_name], (float, int)):
var_set.setRealValue(var_name, row[var_name])
for cat_name in cat_names:
var_set.setCatLabel(cat_name, row[cat_name])
dataset.add(var_set)
return dataset
var_names = var_list if var_list else list(frame.columns)
if weight_var and weight_var not in frame.columns:
raise KeyError("Cannot find weight variable -> {}".format(weight_var))
cat_names = []
roovar_list = []
if categories:
for category in categories:
cat_var = category.GetName()
if cat_var not in frame.columns:
raise KeyError("Cannot find category variable -> {}".format(cat_var))
roovar_list.append(category)
if cat_var in var_names:
var_names.pop(var_names.index(cat_var))
cat_names.append(cat_var)
super_category = 'x'.join(cat.GetName() for cat in categories)
if super_category in var_names:
logger.warning("You asked for variable %s but this is the name of a SuperCategory. Ignoring it.",
super_category)
var_names.pop(var_names.index(super_category))
roovar_list.extend([ROOT.RooRealVar(var_name, var_name, 0.0) for var_name in var_names])
dataset_set = list_to_rooargset(roovar_list)
if ranges:
for var_name, (min_, max_) in ranges.items():
dataset_set[var_name].setMin(min_)
dataset_set[var_name].setMax(max_)
dataset = fill_dataset(name, title, dataset_set, frame)
if weight_var:
dataset = ROOT.RooDataSet(name, title, dataset_set,
ROOT.RooFit.Import(dataset),
ROOT.RooFit.WeightVar(weight_var))
return dataset
def generate(physics_factory, n_events):
"""Perform generation of toys.
Note:
If the factory is simultaneous, events are generated in steps.
For that reason, the configuration for 'gen/nevents' must be a dictionary
of {label -> nevents} keys.
Arguments:
physics_factory (`analysis.physics.PhysicsFactory`): Physics factory object to get
observables, parameters and PDFs from.
n_events (dict, int): Number of events to generate.
Return:
`pandas.DataFrame`: Generated events.
Raise:
ValueError: If the number of events to generate is not properly specified.
KeyError: If an unknown simultaneous category label is requested.
"""
def generate_events(gen_pdf, obs_set, n_events):
"""Generate events according to the given PDF.
Result is converted to a pandas data frame.
Arguments:
gen_pdf (`ROOT.RooAbsPdf`): PDF to use for generation.
obs_set (`ROOT.RooArgSet`): Observables to generate.
n_events (int): Number of events to generate.
Return:
`pandas.DataFrame`: Generated events.
"""
data = gen_pdf.generate(obs_set, n_events)
dataframe = pandas_from_dataset(data)
destruct_object(data)
return dataframe
observables = list_to_rooargset(physics_factory.get_observables())
if physics_factory.is_simultaneous():
if not isinstance(n_events, dict):
raise ValueError(
"Generation of a simultaneous requires a dictionary for the number of events."
)
output_dataset = None
for label, n_events_label in n_events.items():
label_factory = physics_factory.get_children().get(label)
if not label_factory:
raise KeyError("Unknown label -> {}".format(label))
label_df = generate_events(
label_factory.get_pdf("GenPdf_{}".format(label),
"GenPdf_{}".format(label)), observables,
n_events_label).assign(category=label)
if output_dataset is None:
output_dataset = label_df
else:
output_dataset = output_dataset.append(label_df)
return output_dataset
else:
if not isinstance(n_events, int):
raise ValueError("Number of events to generate is not an integer")
return generate_events(physics_factory.get_pdf("GenPdf", "GenPdf"),
observables, n_events)
