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tamaas/tests/test_fftfreq.cpp
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test_fftfreq.cpp
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/**
* @file
* LICENSE
*
* Copyright (©) 2016-2021 EPFL (École Polytechnique Fédérale de Lausanne),
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "fft_engine.hh"
#include "grid.hh"
#include "grid_hermitian.hh"
#include "grid_view.hh"
#include "mpi_interface.hh"
#include "partitioner.hh"
#include "test.hh"
#include <pybind11/embed.h>
#include <pybind11/numpy.h>
#include <pybind11/pybind11.h>
using namespace tamaas;
namespace py = pybind11;
/* -------------------------------------------------------------------------- */
TEST(TestFFTEngine, Frequencies1D) {
mpi::sequential_guard guard{};
std::array<UInt, 1> sizes = {{10}};
auto freq = FFTEngine::computeFrequencies<Real, 1, false>(sizes);
py::module fftfreq = py::module::import("fftfreq");
std::vector<Real> reference(freq.dataSize());
py::array py_arg(reference.size(), reference.data(), py::none());
fftfreq.attr("frequencies1D")(py_arg);
EXPECT_TRUE(compare(reference, freq, AreFloatEqual()))
<< "Non hermitian frequencies are wrong";
auto hfreq = FFTEngine::computeFrequencies<Real, 1, true>(sizes);
std::iota(reference.begin(), reference.end(), 0);
EXPECT_TRUE(compare(reference, hfreq, AreFloatEqual()))
<< "Hermitian frequencies are wrong";
}
/* -------------------------------------------------------------------------- */
TEST(TestFFTEngine, Frequencies2D) {
std::array<UInt, 2> sizes = {{10, 10}};
auto global_sizes = Partitioner<2>::global_size(sizes);
auto freq = FFTEngine::computeFrequencies<Real, 2, false>(sizes);
auto hfreq = FFTEngine::computeFrequencies<Real, 2, true>(sizes);
auto gathered = Partitioner<2>::gather(freq);
auto hgathered = Partitioner<2>::gather(hfreq);
if (mpi::rank() != 0)
return;
py::module fftfreq = py::module::import("fftfreq");
std::vector<Real> reference(gathered.dataSize());
py::array py_arg({global_sizes[0], global_sizes[1], 2u}, reference.data(),
py::none());
fftfreq.attr("frequencies2D")(py_arg);
EXPECT_TRUE(compare(reference, gathered, AreFloatEqual()))
<< "Non hermitian frequencies are wrong";
fftfreq.attr("hfrequencies2D")(py_arg);
EXPECT_TRUE(compare(reference, hgathered, AreFloatEqual()))
<< "Hermitian frequencies are wrong";
}
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