test_coverage.py
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#! /usr/bin/env python
# ==========================================================================
# This script computes the pull distribution for models.
#
# Copyright (C) 2011 Christoph Deil
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# ==========================================================================
from ctatools import *
from gammalib import *
from math import *
import os
import glob
import sys
import csv
# Parameters
events_name = "events.fits"
cntmap_name = "cntmap.fits"
result_name = "results.xml"
caldb = "irf"
irf = "kb_E_50h_v3"
ra = 83.63
dec = 22.01
rad_sim = 10.0
tstart = 0.0
tstop = 1e4
emin = 1
emax = 10
enumbins = 5
nxpix = 200
nypix = 200
binsz = 0.02
coordsys = "CEL"
proj = "CAR"
def run_sim(seed, model_name):
sim = ctobssim()
sim.logFileOpen() # We need this to explicitely open the log file in Python mode
sim["infile"].filename(model_name)
sim["outfile"].filename(events_name)
sim["caldb"].string(caldb)
sim["irf"].string(irf)
sim["seed"].integer(seed)
sim["ra"].real(ra)
sim["dec"].real(dec)
sim["rad"].real(rad_sim)
sim["tmin"].real(tstart)
sim["tmax"].real(tstop)
sim["emin"].real(emin)
sim["emax"].real(emax)
sim.execute()
return sim
def run_bin():
bin = ctbin()
bin.logFileOpen() # We need this to explicitely open the log file in Python mode
bin["evfile"].filename(events_name)
bin["outfile"].filename(cntmap_name)
bin["emin"].real(emin)
bin["emax"].real(emax)
bin["enumbins"].integer(enumbins)
bin["nxpix"].integer(nxpix)
bin["nypix"].integer(nypix)
bin["binsz"].real(binsz)
bin["coordsys"].string(coordsys)
bin["xref"].real(ra)
bin["yref"].real(dec)
bin["proj"].string(proj)
bin.execute()
return bin
def run_like(model_name):
like = ctlike()
like.logFileOpen() # We need this to explicitely open the log file in Python mode
like["cntmap"].filename(cntmap_name)
like["srcmdl"].filename(model_name)
like["outmdl"].filename(result_name)
like["method"].string("BINNED")
like["caldb"].string(caldb)
like["irf"].string(irf)
like.execute()
return like
def test_coverage(n_trials=3, model_name="data/crab.xml"):
"""Simulate and fit ntrials time and look at the
pull distribution for all free parameters.
It should be Gaussian with mean 0 and rms 1"""
results = []
colnames = [] # to preserve the order!
for seed in range(n_trials):
print 'seed:', seed
sim = run_sim(seed, model_name)
run_bin()
like = run_like(model_name)
models = like.obs().models()
result = {}
colnames = []
for par in range(models.npars()):
p = models.par(par)
if p.isfree():
name = p.name()
colnames.append(name)
fitted_value = p.value()
real_value = sim.obs().models().par(par).value()
error = p.error()
pull = (fitted_value - real_value) / error
result[name] = pull
results.append(result)
return results, colnames
if __name__ == '__main__':
usage = "test_coverage xml_model_file n_trials results_file"
if len(sys.argv) < 4:
print usage
sys.exit()
xml_model_file = sys.argv[1]
n_trials = int(sys.argv[2])
results_file = sys.argv[3]
print("Testing coverage for file {0} with {1} trials"
"".format(xml_model_file, n_trials))
results, colnames = test_coverage(n_trials, xml_model_file)
print("Writing pull values for all free parameters to file {0}"
"".format(results_file))
f = open(results_file, 'w')
writer = csv.DictWriter(f, colnames)
writer.writerow(dict((_,_) for _ in colnames))
writer.writerows(results)
f.close()