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test_fftfreq.cpp
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Sun, Apr 28, 15:29

test_fftfreq.cpp
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/*
* SPDX-License-Indentifier: AGPL-3.0-or-later
*
* Copyright (©) 2016-2023 EPFL (École Polytechnique Fédérale de Lausanne),
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
* Copyright (©) 2020-2023 Lucas Frérot
*
* 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{static_cast<py::ssize_t>(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";
}
/* -------------------------------------------------------------------------- */
TEST(TestFFTEngine, RealComponents) {
mpi::sequential_guard guard;
auto even_even{FFTEngine::realCoefficients<2>({{10, 10}})};
auto even_odd{FFTEngine::realCoefficients<2>({{10, 11}})};
auto odd_even{FFTEngine::realCoefficients<2>({{11, 10}})};
auto odd_odd{FFTEngine::realCoefficients<2>({{11, 11}})};
std::vector<UInt> even_even_ref{0, 0, 5, 0, 0, 5, 5, 5};
std::vector<UInt> even_odd_ref{0, 0, 5, 0};
std::vector<UInt> odd_even_ref{0, 0, 0, 5};
std::vector<UInt> odd_odd_ref{0, 0};
auto flatten = [](auto v) {
std::vector<UInt> flat;
for (auto&& tuple : v)
for (auto i : tuple)
flat.push_back(i);
return flat;
};
compare(flatten(even_even), even_even_ref);
compare(flatten(even_odd), even_odd_ref);
compare(flatten(odd_even), odd_even_ref);
compare(flatten(odd_odd), odd_odd_ref);
}

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