# Copyright (C) 2012 Alex Nitz, Josh Willis, Andrew Miller
#
# 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# =============================================================================
#
# Preamble
#
# =============================================================================
#
"""
This module provides classes that describe banks of waveforms
"""
import types
import logging
import os.path
import h5py
from copy import copy
import numpy as np
from ligo.lw import lsctables, utils as ligolw_utils
import pycbc.waveform
import pycbc.pnutils
import pycbc.waveform.compress
from pycbc import DYN_RANGE_FAC
from pycbc.types import FrequencySeries, zeros
import pycbc.io
from pycbc.io.ligolw import LIGOLWContentHandler
import hashlib
[docs]def sigma_cached(self, psd):
""" Cache sigma calculate for use in tandem with the FilterBank class
"""
if not hasattr(self, '_sigmasq'):
from pycbc.opt import LimitedSizeDict
self._sigmasq = LimitedSizeDict(size_limit=2**5)
key = id(psd)
if not hasattr(psd, '_sigma_cached_key'):
psd._sigma_cached_key = {}
if key not in self._sigmasq or id(self) not in psd._sigma_cached_key:
psd._sigma_cached_key[id(self)] = True
# If possible, we precalculate the sigmasq vector for all possible waveforms
if pycbc.waveform.waveform_norm_exists(self.approximant):
if not hasattr(psd, 'sigmasq_vec'):
psd.sigmasq_vec = {}
if self.approximant not in psd.sigmasq_vec:
psd.sigmasq_vec[self.approximant] = \
pycbc.waveform.get_waveform_filter_norm(
self.approximant,
psd,
len(psd),
psd.delta_f,
self.min_f_lower
)
if not hasattr(self, 'sigma_scale'):
# Get an amplitude normalization (mass dependant constant norm)
amp_norm = pycbc.waveform.get_template_amplitude_norm(
self.params, approximant=self.approximant)
amp_norm = 1 if amp_norm is None else amp_norm
self.sigma_scale = (DYN_RANGE_FAC * amp_norm) ** 2.0
curr_sigmasq = psd.sigmasq_vec[self.approximant]
kmin = int(self.f_lower / psd.delta_f)
self._sigmasq[key] = self.sigma_scale * \
(curr_sigmasq[self.end_idx-1] - curr_sigmasq[kmin])
else:
if not hasattr(self, 'sigma_view'):
from pycbc.filter.matchedfilter import get_cutoff_indices
N = (len(self) -1) * 2
kmin, kmax = get_cutoff_indices(
self.min_f_lower or self.f_lower, self.end_frequency,
self.delta_f, N)
self.sslice = slice(kmin, kmax)
self.sigma_view = self[self.sslice].squared_norm() * 4.0 * self.delta_f
if not hasattr(psd, 'invsqrt'):
psd.invsqrt = 1.0 / psd
self._sigmasq[key] = self.sigma_view.inner(psd.invsqrt[self.sslice])
return self._sigmasq[key]
# helper function for parsing approximant strings
[docs]def boolargs_from_apprxstr(approximant_strs):
"""Parses a list of strings specifying an approximant and where that
approximant should be used into a list that can be understood by
FieldArray.parse_boolargs.
Parameters
----------
apprxstr : (list of) string(s)
The strings to parse. Each string should be formatted `APPRX:COND`,
where `APPRX` is the approximant and `COND` is a string specifying
where it should be applied (see `FieldArgs.parse_boolargs` for examples
of conditional strings). The last string in the list may exclude a
conditional argument, which is the same as specifying ':else'.
Returns
-------
boolargs : list
A list of tuples giving the approximant and where to apply them. This
can be passed directly to `FieldArray.parse_boolargs`.
"""
if not isinstance(approximant_strs, list):
approximant_strs = [approximant_strs]
return [tuple(arg.split(':')) for arg in approximant_strs]
[docs]def add_approximant_arg(parser, default=None, help=None):
"""Adds an approximant argument to the given parser.
Parameters
----------
parser : ArgumentParser
The argument parser to add the argument to.
default : {None, str}
Specify a default for the approximant argument. Defaults to None.
help : {None, str}
Provide a custom help message. If None, will use a descriptive message
on how to specify the approximant.
"""
if help is None:
help=str("The approximant(s) to use. Multiple approximants to use "
"in different regions may be provided. If multiple "
"approximants are provided, every one but the last must be "
"be followed by a conditional statement defining where that "
"approximant should be used. Conditionals can be any boolean "
"test understood by numpy. For example, 'Apprx:(mtotal > 4) & "
"(mchirp <= 5)' would use approximant 'Apprx' where total mass "
"is > 4 and chirp mass is <= 5. "
"Conditionals are applied in order, with each successive one "
"only applied to regions not covered by previous arguments. "
"For example, `'TaylorF2:mtotal < 4' 'IMRPhenomD:mchirp < 3'` "
"would result in IMRPhenomD being used where chirp mass is < 3 "
"and total mass is >= 4. The last approximant given may use "
"'else' as the conditional or include no conditional. In either "
"case, this will cause the last approximant to be used in any "
"remaning regions after all the previous conditionals have been "
"applied. For the full list of possible parameters to apply "
"conditionals to, see WaveformArray.default_fields(). Math "
"operations may also be used on parameters; syntax is python, "
"with any operation recognized by numpy.")
parser.add_argument("--approximant", nargs='+', type=str, default=default,
metavar='APPRX[:COND]',
help=help)
[docs]def parse_approximant_arg(approximant_arg, warray):
"""Given an approximant arg (see add_approximant_arg) and a field
array, figures out what approximant to use for each template in the array.
Parameters
----------
approximant_arg : list
The approximant argument to parse. Should be the thing returned by
ArgumentParser when parsing the argument added by add_approximant_arg.
warray : FieldArray
The array to parse. Must be an instance of a FieldArray, or a class
that inherits from FieldArray.
Returns
-------
array
A numpy array listing the approximants to use for each element in
the warray.
"""
return warray.parse_boolargs(boolargs_from_apprxstr(approximant_arg))[0]
[docs]def tuple_to_hash(tuple_to_be_hashed):
"""
Return a hash for a numpy array, avoids native (unsafe) python3 hash function
Parameters
----------
tuple_to_be_hashed: tuple
The tuple which is being hashed
Must be convertible to a numpy array
Returns
-------
int
an integer representation of the hashed array
"""
h = hashlib.blake2b(np.array(tuple_to_be_hashed).tobytes('C'),
digest_size=8)
return np.fromstring(h.digest(), dtype=int)[0]
[docs]class TemplateBank(object):
"""Class to provide some basic helper functions and information
about elements of a template bank.
Parameters
----------
filename : string
The name of the file to load. Must end in '.xml[.gz]' or '.hdf'. If an
hdf file, it should have a 'parameters' in its `attrs` which gives a
list of the names of fields to load from the file. If no 'parameters'
are found, all of the top-level groups in the file will assumed to be
parameters (a warning will be printed to stdout in this case). If an
xml file, it must have a `SnglInspiral` table.
approximant : {None, (list of) string(s)}
Specify the approximant(s) for each template in the bank. If None
provided, will try to load the approximant from the file. The
approximant may either be a single string (in which case the same
approximant will be used for all templates) or a list of strings and
conditionals specifying where to use the approximant. See
`boolargs_from_apprxstr` for syntax.
parameters : {None, (list of) sting(s)}
Specify what parameters to load from the file. If None, all of the
parameters in the file (if an xml file, this is all of the columns in
the SnglInspiral table, if an hdf file, this is given by the
parameters attribute in the file). The list may include parameters that
are derived from the file's parameters, or functions thereof. For a
full list of possible parameters, see `WaveformArray.default_fields`.
If a derived parameter is specified, only the parameters needed to
compute that parameter will be loaded from the file. For example, if
`parameters='mchirp'`, then only `mass1, mass2` will be loaded from
the file. Note that derived parameters can only be used if the
needed parameters are in the file; e.g., you cannot use `chi_eff` if
`spin1z`, `spin2z`, `mass1`, and `mass2` are in the input file.
\**kwds :
Any additional keyword arguments are stored to the `extra_args`
attribute.
Attributes
----------
table : WaveformArray
An instance of a WaveformArray containing all of the information about
the parameters of the bank.
has_compressed_waveforms : {False, bool}
True if compressed waveforms are present in the the (hdf) file; False
otherwise.
indoc : {None, xmldoc}
If an xml file was provided, an in-memory representation of the xml.
Otherwise, None.
filehandler : {None, h5py.File}
If an hdf file was provided, the file handler pointing to the hdf file
(left open after initialization). Otherwise, None.
extra_args : {None, dict}
Any extra keyword arguments that were provided on initialization.
"""
def __init__(self, filename, approximant=None, parameters=None,
**kwds):
self.has_compressed_waveforms = False
ext = os.path.basename(filename)
if ext.endswith(('.xml', '.xml.gz', '.xmlgz')):
self.filehandler = None
self.indoc = ligolw_utils.load_filename(
filename, False, contenthandler=LIGOLWContentHandler)
self.table = lsctables.SnglInspiralTable.get_table(self.indoc)
self.table = pycbc.io.WaveformArray.from_ligolw_table(self.table,
columns=parameters)
# inclination stored in xml alpha3 column
names = list(self.table.dtype.names)
names = tuple([n if n != 'alpha3' else 'inclination' for n in names])
# low frequency cutoff in xml alpha6 column
names = tuple([n if n!= 'alpha6' else 'f_lower' for n in names])
self.table.dtype.names = names
elif ext.endswith(('hdf', '.h5', '.hdf5')):
self.indoc = None
f = h5py.File(filename, 'r')
self.filehandler = f
try:
fileparams = list(f.attrs['parameters'])
except KeyError:
# just assume all of the top-level groups are the parameters
fileparams = list(f.keys())
logging.info("WARNING: no parameters attribute found. "
"Assuming that %s " %(', '.join(fileparams)) +
"are the parameters.")
tmp_params = []
# At this point fileparams might be bytes. Fix if it is
for param in fileparams:
try:
param = param.decode()
tmp_params.append(param)
except AttributeError:
tmp_params.append(param)
fileparams = tmp_params
# use WaveformArray's syntax parser to figure out what fields
# need to be loaded
if parameters is None:
parameters = fileparams
common_fields = list(pycbc.io.WaveformArray(1,
names=parameters).fieldnames)
add_fields = list(set(parameters) &
(set(fileparams) - set(common_fields)))
# load
dtype = []
data = {}
for key in common_fields+add_fields:
data[key] = f[key][:]
dtype.append((key, data[key].dtype))
num = f[fileparams[0]].size
self.table = pycbc.io.WaveformArray(num, dtype=dtype)
for key in data:
self.table[key] = data[key]
# add the compressed waveforms, if they exist
self.has_compressed_waveforms = 'compressed_waveforms' in f
else:
raise ValueError("Unsupported template bank file extension %s" %(
ext))
# if approximant is specified, override whatever was in the file
# (if anything was in the file)
if approximant is not None:
# get the approximant for each template
dtype = h5py.string_dtype(encoding='utf-8')
apprxs = np.array(self.parse_approximant(approximant),
dtype=dtype)
if 'approximant' not in self.table.fieldnames:
self.table = self.table.add_fields(apprxs, 'approximant')
else:
self.table['approximant'] = apprxs
self.extra_args = kwds
self.ensure_hash()
@property
def parameters(self):
"""tuple: The parameters loaded from the input file.
Same as `table.fieldnames`.
"""
return self.table.fieldnames
[docs] def ensure_hash(self):
"""Ensure that there is a correctly populated template_hash.
Check for a correctly populated template_hash and create if it doesn't
already exist.
"""
fields = self.table.fieldnames
if 'template_hash' in fields:
return
# The fields to use in making a template hash
hash_fields = ['mass1', 'mass2', 'inclination',
'spin1x', 'spin1y', 'spin1z',
'spin2x', 'spin2y', 'spin2z',]
fields = [f for f in hash_fields if f in fields]
template_hash = np.array([tuple_to_hash(v) for v in zip(*[self.table[p]
for p in fields])])
if not np.unique(template_hash).size == template_hash.size:
raise RuntimeError("Some template hashes clash. This should not "
"happen.")
self.table = self.table.add_fields(template_hash, 'template_hash')
[docs] def write_to_hdf(self, filename, start_index=None, stop_index=None,
force=False, skip_fields=None,
write_compressed_waveforms=True):
"""Writes self to the given hdf file.
Parameters
----------
filename : str
The name of the file to write to. Must be a recognised HDF5
file extension
start_index : If a specific slice of the template bank is to be
written to the hdf file, this would specify the index of the
first template in the slice
stop_index : If a specific slice of the template bank is to be
written to the hdf file, this would specify the index of the
last template in the slice
force : {False, bool}
If the file already exists, it will be overwritten if True.
Otherwise, an OSError is raised if the file exists.
skip_fields : {None, (list of) strings}
Do not write the given fields to the hdf file. Default is None,
in which case all fields in self.table.fieldnames are written.
write_compressed_waveforms : {True, bool}
Write compressed waveforms to the output (hdf) file if this is
True, which is the default setting. If False, do not write the
compressed waveforms group, but only the template parameters to
the output file.
Returns
-------
h5py.File
The file handler to the output hdf file (left open).
"""
if not filename.endswith(('.hdf', '.h5', '.hdf5')):
raise ValueError("Unrecoginized file extension")
if os.path.exists(filename) and not force:
raise IOError("File %s already exists" %(filename))
f = h5py.File(filename, 'w')
parameters = self.parameters
if skip_fields is not None:
if not isinstance(skip_fields, list):
skip_fields = [skip_fields]
parameters = [p for p in parameters if p not in skip_fields]
# save the parameters
f.attrs['parameters'] = parameters
write_tbl = self.table[start_index:stop_index]
for p in parameters:
f[p] = write_tbl[p]
if write_compressed_waveforms and self.has_compressed_waveforms:
for tmplt_hash in write_tbl.template_hash:
compressed_waveform = pycbc.waveform.compress.CompressedWaveform.from_hdf(
self.filehandler, tmplt_hash,
load_now=True)
compressed_waveform.write_to_hdf(f, tmplt_hash)
return f
[docs] def end_frequency(self, index):
""" Return the end frequency of the waveform at the given index value
"""
if hasattr(self.table[index], 'f_final'):
return self.table[index].f_final
return pycbc.waveform.get_waveform_end_frequency(
self.table[index],
approximant=self.approximant(index),
**self.extra_args)
[docs] def parse_approximant(self, approximant):
"""Parses the given approximant argument, returning the approximant to
use for each template in self. This is done by calling
`parse_approximant_arg` using self's table as the array; see that
function for more details."""
return parse_approximant_arg(approximant, self.table)
[docs] def approximant(self, index):
""" Return the name of the approximant ot use at the given index
"""
if 'approximant' not in self.table.fieldnames:
raise ValueError("approximant not found in input file and no "
"approximant was specified on initialization")
apx = self.table["approximant"][index]
if hasattr(apx, 'decode'):
apx = apx.decode()
return apx
def __len__(self):
return len(self.table)
[docs] def template_thinning(self, inj_filter_rejector):
"""Remove templates from bank that are far from all injections."""
if not inj_filter_rejector.enabled or \
inj_filter_rejector.chirp_time_window is None:
# Do nothing!
return
injection_parameters = inj_filter_rejector.injection_params.table
fref = inj_filter_rejector.f_lower
threshold = inj_filter_rejector.chirp_time_window
m1= self.table['mass1']
m2= self.table['mass2']
tau0_temp, _ = pycbc.pnutils.mass1_mass2_to_tau0_tau3(m1, m2, fref)
indices = []
sort = tau0_temp.argsort()
tau0_temp = tau0_temp[sort]
for inj in injection_parameters:
tau0_inj, _ = \
pycbc.pnutils.mass1_mass2_to_tau0_tau3(inj.mass1, inj.mass2,
fref)
lid = np.searchsorted(tau0_temp, tau0_inj - threshold)
rid = np.searchsorted(tau0_temp, tau0_inj + threshold)
inj_indices = sort[lid:rid]
indices.append(inj_indices)
indices_combined = np.concatenate(indices)
indices_unique= np.unique(indices_combined)
self.table = self.table[indices_unique]
[docs] def ensure_standard_filter_columns(self, low_frequency_cutoff=None):
""" Initialize FilterBank common fields
Parameters
----------
low_frequency_cutoff: {float, None}, Optional
A low frequency cutoff which overrides any given within the
template bank file.
"""
# Make sure we have a template duration field
if not hasattr(self.table, 'template_duration'):
self.table = self.table.add_fields(np.zeros(len(self.table),
dtype=np.float32), 'template_duration')
# Make sure we have a f_lower field
if low_frequency_cutoff is not None:
if not hasattr(self.table, 'f_lower'):
vec = np.zeros(len(self.table), dtype=np.float32)
self.table = self.table.add_fields(vec, 'f_lower')
self.table['f_lower'][:] = low_frequency_cutoff
self.min_f_lower = min(self.table['f_lower'])
if self.f_lower is None and self.min_f_lower == 0.:
raise ValueError('Invalid low-frequency cutoff settings')
[docs]class LiveFilterBank(TemplateBank):
def __init__(self, filename, sample_rate, minimum_buffer,
approximant=None, increment=8, parameters=None,
low_frequency_cutoff=None,
**kwds):
self.increment = increment
self.filename = filename
self.sample_rate = sample_rate
self.minimum_buffer = minimum_buffer
self.f_lower = low_frequency_cutoff
super(LiveFilterBank, self).__init__(filename, approximant=approximant,
parameters=parameters, **kwds)
self.ensure_standard_filter_columns(low_frequency_cutoff=low_frequency_cutoff)
self.param_lookup = {}
for i, p in enumerate(self.table):
key = (p.mass1, p.mass2, p.spin1z, p.spin2z)
assert(key not in self.param_lookup) # Uh, oh, template confusion!
self.param_lookup[key] = i
[docs] def round_up(self, num):
"""Determine the length to use for this waveform by rounding.
Parameters
----------
num : int
Proposed size of waveform in samples.
Returns
-------
size: int
The rounded size to use for the waveform buffer in samples.
This is calculated using an internal `increment` attribute, which
determines the discreteness of the rounding.
"""
inc = self.increment
size = np.ceil(num / self.sample_rate / inc) * self.sample_rate * inc
return size
[docs] def getslice(self, sindex):
instance = copy(self)
instance.table = self.table[sindex]
return instance
[docs] def id_from_param(self, param_tuple):
"""Get the index of this template based on its param tuple
Parameters
----------
param_tuple : tuple
Tuple of the parameters which uniquely identify this template
Returns
--------
index : int
The ordered index that this template has in the template bank.
"""
return self.param_lookup[param_tuple]
def __getitem__(self, index):
if isinstance(index, slice):
return self.getslice(index)
return self.get_template(index)
[docs] def freq_resolution_for_template(self, index):
"""Compute the correct resolution for a frequency series that contains
a given template in the bank.
"""
from pycbc.waveform.waveform import props
time_duration = self.minimum_buffer
time_duration += 0.5
params = props(self.table[index])
params.pop('approximant')
approximant = self.approximant(index)
waveform_duration = pycbc.waveform.get_waveform_filter_length_in_time(
approximant, **params
)
if waveform_duration is None:
raise RuntimeError(
'Template waveform {approximant} not recognized!'
)
time_duration += waveform_duration
td_samples = self.round_up(time_duration * self.sample_rate)
return self.sample_rate / float(td_samples)
[docs] def get_template(self, index, delta_f=None):
"""Calculate and return the frequency-domain waveform for the template
with the given index. The frequency resolution can optionally be given.
Parameters
----------
index: int
Index of the template in the bank.
delta_f: float, optional
Resolution of the resulting frequency series. If not given, it is
calculated from the time duration of the template.
Returns
-------
htilde: FrequencySeries
Template waveform in the frequency domain.
"""
approximant = self.approximant(index)
f_end = self.end_frequency(index)
flow = self.table[index].f_lower
if delta_f is None:
delta_f = self.freq_resolution_for_template(index)
flen = int(self.sample_rate / (2 * delta_f) + 1)
if f_end is None or f_end >= (flen * delta_f):
f_end = (flen - 1) * delta_f
logging.info(
"Generating %s, duration %s s, index %i, starting from %s Hz",
approximant,
1.0 / delta_f,
index,
flow
)
# Get the waveform filter
distance = 1.0 / DYN_RANGE_FAC
htilde = pycbc.waveform.get_waveform_filter(
zeros(flen, dtype=np.complex64), self.table[index],
approximant=approximant, f_lower=flow, f_final=f_end,
delta_f=delta_f, delta_t=1.0 / self.sample_rate, distance=distance,
**self.extra_args)
# If available, record the total duration (which may
# include ringdown) and the duration up to merger since they will be
# erased by the type conversion below.
ttotal = template_duration = -1
time_offset = None
if hasattr(htilde, 'length_in_time'):
ttotal = htilde.length_in_time
if hasattr(htilde, 'chirp_length'):
template_duration = htilde.chirp_length
if hasattr(htilde, 'time_offset'):
time_offset = htilde.time_offset
self.table[index].template_duration = template_duration
htilde = htilde.astype(np.complex64)
htilde.f_lower = flow
htilde.min_f_lower = self.min_f_lower
htilde.end_idx = int(f_end / htilde.delta_f)
htilde.params = self.table[index]
htilde.chirp_length = template_duration
htilde.length_in_time = ttotal
htilde.approximant = approximant
htilde.end_frequency = f_end
if time_offset:
htilde.time_offset = time_offset
# Add sigmasq as a method of this instance
htilde.sigmasq = types.MethodType(sigma_cached, htilde)
htilde.id = self.id_from_param((htilde.params.mass1,
htilde.params.mass2,
htilde.params.spin1z,
htilde.params.spin2z))
return htilde
[docs]class FilterBank(TemplateBank):
def __init__(self, filename, filter_length, delta_f, dtype,
out=None, max_template_length=None,
approximant=None, parameters=None,
enable_compressed_waveforms=True,
low_frequency_cutoff=None,
waveform_decompression_method=None,
**kwds):
self.out = out
self.dtype = dtype
self.f_lower = low_frequency_cutoff
self.filename = filename
self.delta_f = delta_f
self.N = (filter_length - 1 ) * 2
self.delta_t = 1.0 / (self.N * self.delta_f)
self.filter_length = filter_length
self.max_template_length = max_template_length
self.enable_compressed_waveforms = enable_compressed_waveforms
self.waveform_decompression_method = waveform_decompression_method
super(FilterBank, self).__init__(filename, approximant=approximant,
parameters=parameters, **kwds)
self.ensure_standard_filter_columns(low_frequency_cutoff=low_frequency_cutoff)
[docs] def generate_with_delta_f_and_max_freq(self, t_num, max_freq, delta_f,
low_frequency_cutoff=None,
cached_mem=None):
"""Generate the template with index t_num using custom length."""
approximant = self.approximant(t_num)
# Don't want to use INTERP waveforms in here
if approximant.endswith('_INTERP'):
approximant = approximant.replace('_INTERP', '')
# Using SPAtmplt here is bad as the stored cbrt and logv get
# recalculated as we change delta_f values. Fall back to TaylorF2
# in lalsimulation.
if approximant == 'SPAtmplt':
approximant = 'TaylorF2'
if cached_mem is None:
wav_len = int(max_freq / delta_f) + 1
cached_mem = zeros(wav_len, dtype=np.complex64)
if self.has_compressed_waveforms and self.enable_compressed_waveforms:
htilde = self.get_decompressed_waveform(cached_mem, t_num,
f_lower=low_frequency_cutoff,
approximant=approximant,
df=delta_f)
else :
htilde = pycbc.waveform.get_waveform_filter(
cached_mem, self.table[t_num], approximant=approximant,
f_lower=low_frequency_cutoff, f_final=max_freq, delta_f=delta_f,
distance=1./DYN_RANGE_FAC, delta_t=1./(2.*max_freq))
return htilde
def __getitem__(self, index):
# Make new memory for templates if we aren't given output memory
if self.out is None:
tempout = zeros(self.filter_length, dtype=self.dtype)
else:
tempout = self.out
approximant = self.approximant(index)
f_end = self.end_frequency(index)
if f_end is None or f_end >= (self.filter_length * self.delta_f):
f_end = (self.filter_length-1) * self.delta_f
# Find the start frequency, if variable
f_low = find_variable_start_frequency(approximant,
self.table[index],
self.f_lower,
self.max_template_length)
logging.info('%s: generating %s from %s Hz' % (index, approximant, f_low))
# Clear the storage memory
poke = tempout.data # pylint:disable=unused-variable
tempout.clear()
# Get the waveform filter
distance = 1.0 / DYN_RANGE_FAC
if self.has_compressed_waveforms and self.enable_compressed_waveforms:
htilde = self.get_decompressed_waveform(tempout, index, f_lower=f_low,
approximant=approximant, df=None)
else :
htilde = pycbc.waveform.get_waveform_filter(
tempout[0:self.filter_length], self.table[index],
approximant=approximant, f_lower=f_low, f_final=f_end,
delta_f=self.delta_f, delta_t=self.delta_t, distance=distance,
**self.extra_args)
# If available, record the total duration (which may
# include ringdown) and the duration up to merger since they will be
# erased by the type conversion below.
ttotal = template_duration = None
if hasattr(htilde, 'length_in_time'):
ttotal = htilde.length_in_time
if hasattr(htilde, 'chirp_length'):
template_duration = htilde.chirp_length
self.table[index].template_duration = template_duration
htilde = htilde.astype(self.dtype)
htilde.f_lower = f_low
htilde.min_f_lower = self.min_f_lower
htilde.end_idx = int(f_end / htilde.delta_f)
htilde.params = self.table[index]
htilde.chirp_length = template_duration
htilde.length_in_time = ttotal
htilde.approximant = approximant
htilde.end_frequency = f_end
# Add sigmasq as a method of this instance
htilde.sigmasq = types.MethodType(sigma_cached, htilde)
htilde._sigmasq = {}
return htilde
[docs]def find_variable_start_frequency(approximant, parameters, f_start, max_length,
delta_f = 1):
""" Find a frequency value above the starting frequency that results in a
waveform shorter than max_length.
"""
if (f_start is None):
f = parameters.f_lower
elif (max_length is not None):
l = max_length + 1
f = f_start - delta_f
while l > max_length:
f += delta_f
l = pycbc.waveform.get_waveform_filter_length_in_time(approximant,
parameters, f_lower=f)
else :
f = f_start
return f
[docs]class FilterBankSkyMax(TemplateBank):
def __init__(self, filename, filter_length, delta_f,
dtype, out_plus=None, out_cross=None,
max_template_length=None, parameters=None,
low_frequency_cutoff=None, **kwds):
self.out_plus = out_plus
self.out_cross = out_cross
self.dtype = dtype
self.f_lower = low_frequency_cutoff
self.filename = filename
self.delta_f = delta_f
self.N = (filter_length - 1 ) * 2
self.delta_t = 1.0 / (self.N * self.delta_f)
self.filter_length = filter_length
self.max_template_length = max_template_length
super(FilterBankSkyMax, self).__init__(filename, parameters=parameters,
**kwds)
self.ensure_standard_filter_columns(low_frequency_cutoff=low_frequency_cutoff)
def __getitem__(self, index):
# Make new memory for templates if we aren't given output memory
if self.out_plus is None:
tempoutplus = zeros(self.filter_length, dtype=self.dtype)
else:
tempoutplus = self.out_plus
if self.out_cross is None:
tempoutcross = zeros(self.filter_length, dtype=self.dtype)
else:
tempoutcross = self.out_cross
approximant = self.approximant(index)
# Get the end of the waveform if applicable (only for SPAtmplt atm)
f_end = self.end_frequency(index)
if f_end is None or f_end >= (self.filter_length * self.delta_f):
f_end = (self.filter_length-1) * self.delta_f
# Find the start frequency, if variable
f_low = find_variable_start_frequency(approximant,
self.table[index],
self.f_lower,
self.max_template_length)
logging.info('%s: generating %s from %s Hz', index, approximant, f_low)
# What does this do???
poke1 = tempoutplus.data # pylint:disable=unused-variable
poke2 = tempoutcross.data # pylint:disable=unused-variable
# Clear the storage memory
tempoutplus.clear()
tempoutcross.clear()
# Get the waveform filter
distance = 1.0 / DYN_RANGE_FAC
hplus, hcross = pycbc.waveform.get_two_pol_waveform_filter(
tempoutplus[0:self.filter_length],
tempoutcross[0:self.filter_length], self.table[index],
approximant=approximant, f_lower=f_low,
f_final=f_end, delta_f=self.delta_f, delta_t=self.delta_t,
distance=distance, **self.extra_args)
if hasattr(hplus, 'chirp_length') and hplus.chirp_length is not None:
self.table[index].template_duration = hplus.chirp_length
hplus = hplus.astype(self.dtype)
hcross = hcross.astype(self.dtype)
hplus.f_lower = f_low
hcross.f_lower = f_low
hplus.min_f_lower = self.min_f_lower
hcross.min_f_lower = self.min_f_lower
hplus.end_frequency = f_end
hcross.end_frequency = f_end
hplus.end_idx = int(hplus.end_frequency / hplus.delta_f)
hcross.end_idx = int(hplus.end_frequency / hplus.delta_f)
hplus.params = self.table[index]
hcross.params = self.table[index]
hplus.approximant = approximant
hcross.approximant = approximant
# Add sigmasq as a method of this instance
hplus.sigmasq = types.MethodType(sigma_cached, hplus)
hplus._sigmasq = {}
hcross.sigmasq = types.MethodType(sigma_cached, hcross)
hcross._sigmasq = {}
return hplus, hcross
__all__ = ('sigma_cached', 'boolargs_from_apprxstr', 'add_approximant_arg',
'parse_approximant_arg', 'tuple_to_hash', 'TemplateBank',
'LiveFilterBank', 'FilterBank', 'find_variable_start_frequency',
'FilterBankSkyMax')