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python_fft_tests.py
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#!/usr/bin/env python3
# -*- coding:utf-8 -*-
"""
file python_fft_tests.py
@author Till Junge <till.junge@altermail.ch>
@date 17 Jan 2018
@brief Compare µSpectre's fft implementations to numpy reference
@section LICENSE
Copyright © 2018 Till Junge
µSpectre is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3, or (at
your option) any later version.
µSpectre 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 Lesser General Public License
along with µSpectre; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
Additional permission under GNU GPL version 3 section 7
If you modify this Program, or any covered work, by linking or combining it
with proprietary FFT implementations or numerical libraries, containing parts
covered by the terms of those libraries' licenses, the licensors of this
Program grant you additional permission to convey the resulting work.
"""
import unittest
import numpy as np
from python_test_imports import µ
try:
from mpi4py import MPI
comm = MPI.COMM_WORLD
except ImportError:
comm = None
class FFT_Check(unittest.TestCase):
def setUp(self):
self.resolution = [6, 4]
self.dim = len(self.resolution)
self.engines = [('fftw', False),
('fftwmpi', True),
('pfft', True)]
self.tol = 1e-14 * np.prod(self.resolution)
def test_forward_transform(self):
for engine_str, transposed in self.engines:
try:
engine = µ.fft.FFT(self.resolution, self.dim**2, fft=engine_str)
except KeyError:
# This FFT engine has not been compiled into the code. Skip
# test.
continue
engine.initialise()
in_arr = np.random.random([*self.resolution, self.dim, self.dim])
out_ref = np.fft.rfftn(in_arr, axes=(0, 1))
if transposed:
out_ref = out_ref.swapaxes(0, 1)
out_msp = engine.fft(in_arr.reshape(-1, self.dim**2).T).T
err = np.linalg.norm(out_ref -
out_msp.reshape(out_ref.shape))
self.assertTrue(err < self.tol)
def test_reverse_transform(self):
for engine_str, transposed in self.engines:
try:
engine = µ.fft.FFT(self.resolution, self.dim**2, fft=engine_str)
except KeyError:
# This FFT engine has not been compiled into the code. Skip
# test.
continue
engine.initialise()
complex_res = µ.get_hermitian_sizes(self.resolution)
in_arr = np.zeros([*complex_res, self.dim, self.dim],
dtype=complex)
in_arr.real = np.random.random(in_arr.shape)
in_arr.imag = np.random.random(in_arr.shape)
out_ref = np.fft.irfftn(in_arr, axes=(0, 1))
if transposed:
in_arr = in_arr.swapaxes(0, 1)
out_msp = engine.ifft(in_arr.reshape(-1, self.dim**2).T).T
out_msp *= engine.normalisation()
err = np.linalg.norm(out_ref -
out_msp.reshape(out_ref.shape))
self.assertTrue(err < self.tol)
if __name__ == '__main__':
unittest.main()

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