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# -*- coding: utf-8 -*-
# ######### COPYRIGHT #########
# Credits
# #######
#
# Copyright(c) 2015-2025
# ----------------------
#
# * `LabEx Archimède <http://labex-archimede.univ-amu.fr/>`_
# * `Laboratoire d'Informatique Fondamentale <http://www.lif.univ-mrs.fr/>`_
# (now `Laboratoire d'Informatique et Systèmes <http://www.lis-lab.fr/>`_)
# * `Institut de Mathématiques de Marseille <http://www.i2m.univ-amu.fr/>`_
# * `Université d'Aix-Marseille <http://www.univ-amu.fr/>`_
#
# This software is a port from LTFAT 2.1.0 :
# Copyright (C) 2005-2025 Peter L. Soendergaard <peter@sonderport.dk>.
#
# Contributors
# ------------
#
# * Denis Arrivault <contact.dev_AT_lis-lab.fr>
# * Florent Jaillet <contact.dev_AT_lis-lab.fr>
#
# Description
# -----------
#
# ltfatpy is a partial Python port of the
# `Large Time/Frequency Analysis Toolbox <http://ltfat.sourceforge.net/>`_,
# a MATLAB®/Octave toolbox for working with time-frequency analysis and
# synthesis.
#
# Version
# -------
#
# * ltfatpy version = 1.1.2
# * LTFAT version = 2.1.0
#
# Licence
# -------
#
# 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/>.
#
# ######### COPYRIGHT #########
"""Test of the gabphasegrad function
.. moduleauthor:: Florent Jaillet
"""
import unittest
import numpy as np
from numpy.testing import assert_array_equal, assert_allclose
from ltfatpy.gabor.gabphasegrad import gabphasegrad
from ltfatpy.tests.datasets.read_ref_mat import read_ref_mat
from ltfatpy.tests.datasets.get_dataset_path import get_dataset_path
# NOTE: The reference values used in the tests correspond to results
# obtained with Octave using ltfat 2.1.0
class TestGabphasegrad(unittest.TestCase):
# Called before the tests.
def setUp(self):
print('\nStart TestGabphasegrad')
# Called after the tests.
def tearDown(self):
print('Test done')
def test_exceptions(self):
"""Check that the right exceptions are raised when expected
"""
# method should be a string containing either 'dgt' or 'phase' or 'abs'
self.assertRaises(TypeError, gabphasegrad, 1)
self.assertRaises(TypeError, gabphasegrad, 1.0)
self.assertRaises(TypeError, gabphasegrad, (1, 2))
self.assertRaises(ValueError, gabphasegrad, 'test')
# check that passing a wrong L with method 'dgt' raises an exception
f = np.random.random((8,))
g = 'gauss'
a = 2
M = 4
self.assertRaises(ValueError, gabphasegrad, 'dgt', f, g, a, M, L=3)
# check that passing a too long window g with method 'dgt' raises an
# exception
g = np.ones(9)
self.assertRaises(ValueError, gabphasegrad, 'dgt', f, g, a, M)
g = np.ones(5)
self.assertRaises(ValueError, gabphasegrad, 'dgt', f, g, a, M, L=4)
# check that passing complex values instead of real phase values with
# method 'phase' raises an exception
shape = (3, 2)
cphase = np.random.random(shape) + 1.0j*np.random.random(shape)
self.assertRaises(TypeError, gabphasegrad, 'phase', cphase, a)
# check that passing negative values when an absolute value is
# expected with method 'abs' raises an exception
s = - np.random.random(shape)
g = 'gauss'
self.assertRaises(ValueError, gabphasegrad, 'abs', s, g, a)
# check that passing a non-gaussian window g with method 'abs' raises
# an exception
s = np.random.random(shape)
g = np.ones(4)
self.assertRaises(ValueError, gabphasegrad, 'abs', s, g, a)
def test_known(self):
"""Check gabphasegrad on some known results taken from Octave
"""
filename = get_dataset_path('gabphasegrad_ref.mat')
data = read_ref_mat(filename)
for inputs, outputs in data:
method = str(inputs['method'])
if method == 'dgt':
f, g, a, M = (inputs[var] for var in ('f', 'g', 'a', 'M'))
kwargs = dict()
if 'L' in inputs:
kwargs['L'] = inputs['L']
if 'minlvl' in inputs:
kwargs['minlvl'] = inputs['minlvl']
if isinstance(g, str):
# force g to be str instead of unicode under Python 2
g = str(g)
tgrad, fgrad, c = gabphasegrad(method, f, g, a, M, **kwargs)
msg = 'wrong output in gabphasegrad with inputs ' + str(inputs)
assert_allclose(tgrad, outputs[0], rtol=4e-15, err_msg=msg)
assert_allclose(fgrad, outputs[1], rtol=1e-15, err_msg=msg)
assert_allclose(c, outputs[2], rtol=1e-15, err_msg=msg)
elif method == 'phase':
cphase, a = (inputs[var] for var in ('cphase', 'a'))
tgrad, fgrad = gabphasegrad(method, cphase, a)
msg = 'wrong output in gabphasegrad with inputs ' + str(inputs)
assert_array_equal(tgrad, outputs[0], msg)
assert_array_equal(fgrad, outputs[1], msg)
elif method == 'abs':
s, g, a = (inputs[var] for var in ('s', 'g', 'a'))
kwargs = dict()
if 'difforder' in inputs:
kwargs['difforder'] = inputs['difforder']
if isinstance(g, str):
# force g to be str instead of unicode under Python 2
g = str(g)
tgrad, fgrad = gabphasegrad(method, s, g, a, **kwargs)
msg = 'wrong output in gabphasegrad with inputs ' + str(inputs)
assert_allclose(tgrad, outputs[0], err_msg=msg)
assert_allclose(fgrad, outputs[1], err_msg=msg)
if __name__ == '__main__':
suite = unittest.TestLoader().loadTestsFromTestCase(TestGabphasegrad)
unittest.TextTestRunner(verbosity=2).run(suite)
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