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# heng@kedevelopments.co.uk
#
# 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 pyfftw import (
FFTW, n_byte_align_empty, is_n_byte_aligned, simd_alignment)
import pyfftw
from .test_pyfftw_base import run_test_suites
import unittest
import numpy
# FFTW tests that don't seem to fit anywhere else
class FFTWMiscTest(unittest.TestCase):
def __init__(self, *args, **kwargs):
super(FFTWMiscTest, self).__init__(*args, **kwargs)
# Assume python 3, but keep backwards compatibility
if not hasattr(self, 'assertRaisesRegex'):
self.assertRaisesRegex = self.assertRaisesRegexp
def setUp(self):
self.input_array = n_byte_align_empty((256, 512), 16,
dtype='complex128')
self.output_array = n_byte_align_empty((256, 512), 16,
dtype='complex128')
self.fft = FFTW(self.input_array, self.output_array)
self.output_array[:] = (numpy.random.randn(*self.output_array.shape)
+ 1j*numpy.random.randn(*self.output_array.shape))
def test_aligned_flag(self):
'''Test to see if the aligned flag is correct
'''
fft = FFTW(self.input_array, self.output_array)
self.assertTrue(fft.simd_aligned)
fft = FFTW(self.input_array, self.output_array,
flags=('FFTW_UNALIGNED',))
self.assertFalse(fft.simd_aligned)
def test_flags(self):
'''Test to see if the flags are correct
'''
fft = FFTW(self.input_array, self.output_array)
self.assertEqual(fft.flags, ('FFTW_MEASURE',))
fft = FFTW(self.input_array, self.output_array,
flags=('FFTW_DESTROY_INPUT', 'FFTW_UNALIGNED'))
self.assertEqual(fft.flags, ('FFTW_DESTROY_INPUT', 'FFTW_UNALIGNED'))
# Test an implicit flag
_input_array = n_byte_align_empty(256, 16, dtype='complex64')
_output_array = n_byte_align_empty(256, 16, dtype='complex64')
# These are guaranteed to be misaligned (due to dtype size == 8)
input_array = _input_array[:-1]
output_array = _output_array[:-1]
u_input_array = _input_array[1:]
u_output_array = _output_array[1:]
fft = FFTW(input_array, u_output_array)
self.assertEqual(fft.flags, ('FFTW_MEASURE', 'FFTW_UNALIGNED'))
fft = FFTW(u_input_array, output_array)
self.assertEqual(fft.flags, ('FFTW_MEASURE', 'FFTW_UNALIGNED'))
fft = FFTW(u_input_array, u_output_array)
self.assertEqual(fft.flags, ('FFTW_MEASURE', 'FFTW_UNALIGNED'))
def test_differing_aligned_arrays_update(self):
'''Test to see if the alignment code is working as expected
'''
# Start by creating arrays that are only on various byte
# alignments (4, 16 and 32)
_input_array = n_byte_align_empty(
len(self.input_array.ravel())*2+5,
32, dtype='float32')
_output_array = n_byte_align_empty(
len(self.output_array.ravel())*2+5,
32, dtype='float32')
_input_array[:] = 0
_output_array[:] = 0
input_array_4 = (
numpy.frombuffer(_input_array[1:-4].data, dtype='complex64')
.reshape(self.input_array.shape))
output_array_4 = (
numpy.frombuffer(_output_array[1:-4].data, dtype='complex64')
.reshape(self.output_array.shape))
input_array_16 = (
numpy.frombuffer(_input_array[4:-1].data, dtype='complex64')
.reshape(self.input_array.shape))
output_array_16 = (
numpy.frombuffer(_output_array[4:-1].data, dtype='complex64')
.reshape(self.output_array.shape))
input_array_32 = (
numpy.frombuffer(_input_array[:-5].data, dtype='complex64')
.reshape(self.input_array.shape))
output_array_32 = (
numpy.frombuffer(_output_array[:-5].data, dtype='complex64')
.reshape(self.output_array.shape))
input_arrays = {4: input_array_4,
16: input_array_16,
32: input_array_32}
output_arrays = {4: output_array_4,
16: output_array_16,
32: output_array_32}
alignments = (4, 16, 32)
# Test the arrays are aligned on 4 bytes...
self.assertTrue(is_n_byte_aligned(input_arrays[4], 4))
self.assertTrue(is_n_byte_aligned(output_arrays[4], 4))
# ...and on 16...
self.assertFalse(is_n_byte_aligned(input_arrays[4], 16))
self.assertFalse(is_n_byte_aligned(output_arrays[4], 16))
self.assertTrue(is_n_byte_aligned(input_arrays[16], 16))
self.assertTrue(is_n_byte_aligned(output_arrays[16], 16))
# ...and on 32...
self.assertFalse(is_n_byte_aligned(input_arrays[16], 32))
self.assertFalse(is_n_byte_aligned(output_arrays[16], 32))
self.assertTrue(is_n_byte_aligned(input_arrays[32], 32))
self.assertTrue(is_n_byte_aligned(output_arrays[32], 32))
if len(pyfftw.pyfftw._valid_simd_alignments) > 0:
max_align = pyfftw.pyfftw._valid_simd_alignments[0]
else:
max_align = simd_alignment
for in_align in alignments:
for out_align in alignments:
expected_align = min(in_align, out_align, max_align)
fft = FFTW(input_arrays[in_align], output_arrays[out_align])
self.assertTrue(fft.input_alignment == expected_align)
self.assertTrue(fft.output_alignment == expected_align)
for update_align in alignments:
if update_align < expected_align:
# This should fail (not aligned properly)
self.assertRaisesRegex(ValueError,
'Invalid input alignment',
fft.update_arrays,
input_arrays[update_align],
output_arrays[out_align])
self.assertRaisesRegex(ValueError,
'Invalid output alignment',
fft.update_arrays,
input_arrays[in_align],
output_arrays[update_align])
else:
# This should work (and not segfault!)
fft.update_arrays(input_arrays[update_align],
output_arrays[out_align])
fft.update_arrays(input_arrays[in_align],
output_arrays[update_align])
fft.execute()
def test_get_input_array(self):
'''Test to see the get_input_array method returns the correct thing
'''
self.assertIs(self.input_array, self.fft.get_input_array())
def test_get_output_array(self):
'''Test to see the get_output_array method returns the correct thing
'''
self.assertIs(self.output_array, self.fft.get_output_array())
test_cases = (
FFTWMiscTest,)
test_set = None
if __name__ == '__main__':
run_test_suites(test_cases, test_set)
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