python_fft_tests.py
6838d6519bc7master

python_fft_tests.py
View Options

			#!/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()

muSpectre/tests/python_fft_tests.py6838d6519bc7master

python_fft_tests.pyView Options

muSpectre/tests/python_fft_tests.py
6838d6519bc7master

python_fft_tests.py
View Options