From 7809b0c75bf58f0e8e7fa19442d30f4f2370079d Mon Sep 17 00:00:00 2001
From: Colm Talbot <colm.talbot@ligo.org>
Date: Thu, 19 Jul 2018 14:15:46 -0400
Subject: [PATCH] add example of using calibration
---
.../injection_examples/calibration_example.py | 92 +++++++++++++++++++
1 file changed, 92 insertions(+)
create mode 100644 examples/injection_examples/calibration_example.py
diff --git a/examples/injection_examples/calibration_example.py b/examples/injection_examples/calibration_example.py
new file mode 100644
index 000000000..3285bc16c
--- /dev/null
+++ b/examples/injection_examples/calibration_example.py
@@ -0,0 +1,92 @@
+#!/bin/python
+"""
+Tutorial to demonstrate running parameter estimation on a reduced parameter space for an injected signal.
+
+This example estimates the masses using a uniform prior in both component masses and distance using a uniform in
+comoving volume prior on luminosity distance between luminosity distances of 100Mpc and 5Gpc, the cosmology is WMAP7.
+"""
+from __future__ import division, print_function
+
+import numpy as np
+
+import tupak
+
+# Set the duration and sampling frequency of the data segment that we're going to inject the signal into
+
+duration = 4.
+sampling_frequency = 2048.
+
+# Specify the output directory and the name of the simulation.
+outdir = 'outdir'
+label = 'calibration'
+tupak.core.utils.setup_logger(outdir=outdir, label=label)
+
+# Set up a random seed for result reproducibility. This is optional!
+np.random.seed(88170235)
+
+# We are going to inject a binary black hole waveform. We first establish a dictionary of parameters that
+# includes all of the different waveform parameters, including masses of the two black holes (mass_1, mass_2),
+# spins of both black holes (a, tilt, phi), etc.
+injection_parameters = dict(mass_1=36., mass_2=29., a_1=0.4, a_2=0.3, tilt_1=0.5, tilt_2=1.0, phi_12=1.7, phi_jl=0.3,
+ luminosity_distance=2000., iota=0.4, psi=2.659, phase=1.3, geocent_time=1126259642.413,
+ ra=1.375, dec=-1.2108)
+
+# Fixed arguments passed into the source model
+waveform_arguments = dict(waveform_approximant='IMRPhenomPv2',
+ reference_frequency=50.)
+
+# Create the waveform_generator using a LAL BinaryBlackHole source function
+waveform_generator = tupak.WaveformGenerator(duration=duration,
+ sampling_frequency=sampling_frequency,
+ frequency_domain_source_model=tupak.gw.source.lal_binary_black_hole,
+ parameters=injection_parameters,
+ waveform_arguments=waveform_arguments)
+hf_signal = waveform_generator.frequency_domain_strain()
+
+# Set up interferometers. In this case we'll use three interferometers (LIGO-Hanford (H1), LIGO-Livingston (L1),
+# and Virgo (V1)). These default to their design sensitivity
+ifos = tupak.gw.detector.InterferometerSet(['H1', 'L1', 'V1'])
+for ifo in ifos:
+ injection_parameters.update({'recalib_{}_amplitude_{}'.format(ifo.name, ii): 0.1 for ii in range(5)})
+ injection_parameters.update({'recalib_{}_phase_{}'.format(ifo.name, ii): 0.01 for ii in range(5)})
+ ifo.calibration_model = tupak.gw.calibration.CubicSpline(
+ prefix='recalib_{}_'.format(ifo.name), minimum_frequency=ifo.minimum_frequency,
+ maximum_frequency=ifo.maximum_frequency, n_points=5)
+ifos.set_strain_data_from_power_spectral_densities(sampling_frequency=sampling_frequency, duration=duration)
+ifos.inject_signal(parameters=injection_parameters, waveform_generator=waveform_generator)
+# IFOs = [tupak.gw.detector.get_interferometer_with_fake_noise_and_injection(
+# name, injection_polarizations=hf_signal, injection_parameters=injection_parameters, duration=duration,
+# sampling_frequency=sampling_frequency, outdir=outdir) for name in ['H1', 'L1']]
+
+# Set up prior, which is a dictionary
+# By default we will sample all terms in the signal models. However, this will take a long time for the calculation,
+# so for this example we will set almost all of the priors to be equall to their injected values. This implies the
+# prior is a delta function at the true, injected value. In reality, the sampler implementation is smart enough to
+# not sample any parameter that has a delta-function prior.
+# The above list does *not* include mass_1, mass_2, iota and luminosity_distance, which means those are the parameters
+# that will be included in the sampler. If we do nothing, then the default priors get used.
+priors = tupak.gw.prior.BBHPriorSet()
+priors['geocent_time'] = tupak.core.prior.Uniform(
+ minimum=injection_parameters['geocent_time'] - 1, maximum=injection_parameters['geocent_time'] + 1,
+ name='geocent_time', latex_label='$t_c$')
+for key in ['a_1', 'a_2', 'tilt_1', 'tilt_2', 'phi_12', 'phi_jl', 'psi', 'ra', 'dec', 'geocent_time', 'phase',
+ 'iota', 'luminosity_distance', 'mass_1', 'mass_2']:
+ priors[key] = injection_parameters[key]
+for key in injection_parameters:
+ if 'recalib' in key:
+ priors[key] = injection_parameters[key]
+for name in ['recalib_H1_amplitude_0', 'recalib_H1_amplitude_1', 'recalib_H1_amplitude_2']:
+ priors[name] = tupak.prior.Gaussian(mu=0, sigma=0.2, name=name, latex_label='H1 $A_{}$'.format(name[-1]))
+
+# Initialise the likelihood by passing in the interferometer data (IFOs) and the waveoform generator
+likelihood = tupak.GravitationalWaveTransient(interferometers=ifos, waveform_generator=waveform_generator,
+ time_marginalization=False, phase_marginalization=False,
+ distance_marginalization=False, prior=priors)
+
+# Run sampler. In this case we're going to use the `dynesty` sampler
+result = tupak.run_sampler(likelihood=likelihood, priors=priors, sampler='dynesty', npoints=1000,
+ injection_parameters=injection_parameters, outdir=outdir, label=label)
+
+# make some plots of the outputs
+result.plot_corner()
+
--
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