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test_fftw_comparison.cc
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test_fftw_comparison.cc
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/**
* file test_fftw_c2c.cc
*
* @author Till Junge <till.junge@epfl.ch>
*
* @date 11 May 2017
*
* @brief test fftw redundant class
*
* @section LICENCE
*
* Copyright (C) 2017 Till Junge
*
* µSpectre 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, 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 General Public License
* along with GNU Emacs; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <boost/test/unit_test.hpp>
#include <iostream>
#include <complex>
#include <unsupported/Eigen/CXX11/Tensor>
#include <Eigen/Dense>
#include "system/fftw_engine_c2c.hh"
#include "system/fftw_engine_r2c.hh"
#include "tests.hh"
#include "materials/materials_toolbox.hh"
namespace muSpectre {
template <Dim_t DimS, Dim_t DimM>
struct fftw_comp_fixture{
fftw_comp_fixture()
:fftwc(std_nb_pix, FFT_PlanFlags::estimate),
fftwr(std_nb_pix, FFT_PlanFlags::estimate){}
const static typename FFTW_EngineC2C<DimS,DimM>::Ccoord std_nb_pix;
FFTW_EngineC2C<DimS,DimM> fftwc;
FFTW_EngineR2C<DimS,DimM> fftwr;
};
template<> const Ccoord_t<1> fftw_comp_fixture<1,1>::std_nb_pix{3};
template<> const Ccoord_t<2> fftw_comp_fixture<2,2>::std_nb_pix{5,3};
template<> const Ccoord_t<2> fftw_comp_fixture<2,1>::std_nb_pix{5,3};
template<> const Ccoord_t<3> fftw_comp_fixture<3,3>::std_nb_pix{7,5,3};
using fix2 = fftw_comp_fixture<2, 2>;
BOOST_FIXTURE_TEST_CASE(fftw_comparison, fix2) {
const size_t dim_m = 2;
const size_t tot_nb_pixels = fftwc.get_tot_nb_pixels();
Real in_arr[tot_nb_pixels*dim_m*dim_m];
for (size_t i = 0; i < tot_nb_pixels; ++i) {
for (size_t d = 0; d < dim_m*dim_m; ++d) {
in_arr[i*dim_m*dim_m+d] = i;
}
}
Eigen::Tensor<Real, 5>G(dim_m, dim_m, dim_m, dim_m, tot_nb_pixels);
G.setZero();
for (size_t i = 1; i < tot_nb_pixels; ++i) {
Eigen::TensorMap<Eigen::Tensor<Real,4>> Gmap(G.data()+dim_m*dim_m*dim_m*dim_m*i, dim_m, dim_m,dim_m,dim_m);
Gmap = Tensors::I4<dim_m>();
}
Eigen::Tensor<Real,3> resc(dim_m, dim_m, tot_nb_pixels);
Eigen::Tensor<Real,3> resr(dim_m, dim_m, tot_nb_pixels);
fftwc.convolve(G.data(), in_arr, resc.data());
fftwr.convolve(G.data(), in_arr, resr.data());
Eigen::Map<Eigen::VectorXd>cmap(resc.data(), resc.size());
Eigen::Map<Eigen::VectorXd>rmap(resr.data(), resr.size());
Real error = (rmap-cmap).norm()/rmap.norm();
Real tol = 1e-14;
BOOST_CHECK_LT(error, tol);
}
} // muSpectre

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