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# author : S. Mandalia
# s.p.mandalia@qmul.ac.uk
#
# date : April 04, 2018
"""
Likelihood functions for the BSM flavour ratio analysis
"""
from __future__ import absolute_import, division
from functools import partial
import numpy as np
from scipy.stats import multivariate_normal, rv_continuous
from utils import fr as fr_utils
from utils import gf as gf_utils
from utils.enums import EnergyDependance, Likelihood, ParamTag, PriorsCateg
from utils.misc import enum_parse
class Gaussian(rv_continuous):
"""Gaussian for one dimension."""
def _pdf(self, x, mu, sig):
return (1./np.sqrt(2*np.pi*sig**2))*np.exp(-((x-mu)**2)/(2*sig**2))
def multi_gaussian(fr, fr_bf, sigma, offset=-320):
"""Multivariate gaussian likelihood."""
cov_fr = np.identity(3) * sigma
return np.log(multivariate_normal.pdf(fr, mean=fr_bf, cov=cov_fr)) + offset
def likelihood_argparse(parser):
parser.add_argument(
'--likelihood', default='gaussian', type=partial(enum_parse, c=Likelihood),
choices=Likelihood, help='likelihood contour'
)
parser.add_argument(
'--sigma-ratio', type=float, default=0.01,
help='Set the 1 sigma for the measured flavour ratio for a gaussian LLH'
)
def lnprior(theta, paramset):
"""Priors on theta."""
if len(theta) != len(paramset):
raise AssertionError(
'Length of MCMC scan is not the same as the input '
'params\ntheta={0}\nparamset={1}'.format(theta, paramset)
)
for idx, param in enumerate(paramset):
param.value = theta[idx]
ranges = paramset.ranges
for value, range in zip(theta, ranges):
if range[0] <= value <= range[1]:
pass
else: return -np.inf
prior = 0
for param in paramset:
if param.prior is PriorsCateg.GAUSSIAN:
prior += Gaussian().logpdf(
param.nominal_value, param.value, param.std
)
elif param.prior is PriorsCateg.HALFGAUSS:
prior += Gaussian().logpdf(
param.nominal_value, param.value, param.std
) + Gaussian().logcdf(1, param.value, param.std)
return prior
def triangle_llh(theta, args, asimov_paramset, llh_paramset, fitter):
"""Log likelihood function for a given theta."""
if len(theta) != len(llh_paramset):
raise AssertionError(
'Length of MCMC scan is not the same as the input '
'params\ntheta={0}\nparamset]{1}'.format(theta, llh_paramset)
)
for idx, param in enumerate(llh_paramset):
param.value = theta[idx]
hypo_paramset = asimov_paramset
for param in llh_paramset.from_tag(ParamTag.NUISANCE):
hypo_paramset[param.name].value = param.value
if args.energy_dependance is EnergyDependance.SPECTRAL:
bin_centers = np.sqrt(args.binning[:-1]*args.binning[1:])
bin_width = np.abs(np.diff(args.binning))
if args.likelihood in [Likelihood.GOLEMFIT, Likelihood.GF_FREQ] \
and args.fold_index:
args.spectral_index = -hypo_paramset['astroDeltaGamma'].value
if args.fix_source_ratio:
if args.energy_dependance is EnergyDependance.MONO:
source_flux = args.source_ratio
elif args.energy_dependance is EnergyDependance.SPECTRAL:
source_flux = np.array(
[fr * np.power(bin_centers, args.spectral_index)
for fr in args.source_ratio]
).T
else:
if args.energy_dependance is EnergyDependance.MONO:
source_flux = fr_utils.angles_to_fr(
llh_paramset.from_tag(ParamTag.SRCANGLES, values=True)
)
elif args.energy_dependance is EnergyDependance.SPECTRAL:
source_flux = np.array(
[fr * np.power(bin_centers, args.spectral_index)
for fr in fr_utils.angles_to_fr(theta[-2:])]
).T
bsm_angles = llh_paramset.from_tag(
[ParamTag.SCALE, ParamTag.MMANGLES], values=True
)
m_eig_names = ['m21_2', 'm3x_2']
ma_names = ['s_12_2', 'c_13_4', 's_23_2', 'dcp']
if set(m_eig_names+ma_names).issubset(set(llh_paramset.names)):
mass_eigenvalues = [x.value for x in llh_paramset if x.name in m_eig_names]
sm_u = fr_utils.angles_to_u(
[x.value for x in llh_paramset if x.name in ma_names]
)
else:
mass_eigenvalues = fr_utils.MASS_EIGENVALUES
sm_u = fr_utils.NUFIT_U
if args.energy_dependance is EnergyDependance.MONO:
u = fr_utils.params_to_BSMu(
theta = bsm_angles,
dim = args.dimension,
energy = args.energy,
mass_eigenvalues = mass_eigenvalues,
sm_u = sm_u,
no_bsm = args.no_bsm,
fix_mixing = args.fix_mixing,
fix_mixing_almost = args.fix_mixing_almost,
fix_scale = args.fix_scale,
scale = args.scale
)
fr = fr_utils.u_to_fr(source_flux, u)
elif args.energy_dependance is EnergyDependance.SPECTRAL:
mf_perbin = []
for i_sf, sf_perbin in enumerate(source_flux):
u = fr_utils.params_to_BSMu(
theta = bsm_angles,
dim = args.dimension,
energy = bin_centers[i_sf],
mass_eigenvalues = mass_eigenvalues,
sm_u = sm_u,
no_bsm = args.no_bsm,
fix_mixing = args.fix_mixing,
fix_mixing_almost = args.fix_mixing_almost,
fix_scale = args.fix_scale,
scale = args.scale
)
fr = fr_utils.u_to_fr(sf_perbin, u)
mf_perbin.append(fr)
measured_flux = np.array(mf_perbin).T
intergrated_measured_flux = np.sum(measured_flux * bin_width, axis=1)
averaged_measured_flux = (1./(args.binning[-1] - args.binning[0])) * \
intergrated_measured_flux
fr = averaged_measured_flux / np.sum(averaged_measured_flux)
flavour_angles = fr_utils.fr_to_angles(fr)
# print 'flavour_angles', map(float, flavour_angles)
for idx, param in enumerate(hypo_paramset.from_tag(ParamTag.BESTFIT)):
param.value = flavour_angles[idx]
if args.likelihood is Likelihood.FLAT:
llh = 1.
elif args.likelihood is Likelihood.GAUSSIAN:
fr_bf = args.measured_ratio
llh = multi_gaussian(fr, fr_bf, args.sigma_ratio)
elif args.likelihood is Likelihood.GOLEMFIT:
llh = gf_utils.get_llh(fitter, hypo_paramset)
elif args.likelihood is Likelihood.GF_FREQ:
llh = gf_utils.get_llh_freq(fitter, hypo_paramset)
return llh
def ln_prob(theta, args, asimov_paramset, llh_paramset, fitter):
lp = lnprior(theta, paramset=llh_paramset)
if not np.isfinite(lp):
return -np.inf
return lp + triangle_llh(
theta, args=args, asimov_paramset=asimov_paramset,
llh_paramset=llh_paramset, fitter=fitter
)
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