lower_trs_kernels.cpp

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#include <ginkgo/core/solver/lower_trs.hpp>


#include <gtest/gtest.h>


#include <memory>
#include <random>


#include <ginkgo/core/base/exception.hpp>
#include <ginkgo/core/base/executor.hpp>
#include <ginkgo/core/matrix/csr.hpp>
#include <ginkgo/core/matrix/dense.hpp>


#include "core/solver/lower_trs_kernels.hpp"
#include "core/test/utils.hpp"


namespace {


class LowerTrs : public ::testing::Test {
protected:
    using CsrMtx = gko::matrix::Csr<double, gko::int32>;
    using Mtx = gko::matrix::Dense<>;
    LowerTrs() : rand_engine(30) {}

    void SetUp()
    {
        ASSERT_GT(gko::CudaExecutor::get_num_devices(), 0);
        ref = gko::ReferenceExecutor::create();
        cuda = gko::CudaExecutor::create(0, ref);
    }

    void TearDown()
    {
        if (cuda != nullptr) {
            ASSERT_NO_THROW(cuda->synchronize());
        }
    }

    std::unique_ptr<Mtx> gen_mtx(int num_rows, int num_cols)
    {
        return gko::test::generate_random_matrix<Mtx>(
            num_rows, num_cols,
            std::uniform_int_distribution<>(num_cols, num_cols),
            std::normal_distribution<>(-1.0, 1.0), rand_engine, ref);
    }

    std::unique_ptr<Mtx> gen_l_mtx(int num_rows, int num_cols)
    {
        return gko::test::generate_random_lower_triangular_matrix<Mtx>(
            num_rows, num_cols, false,
            std::uniform_int_distribution<>(num_cols, num_cols),
            std::normal_distribution<>(-1.0, 1.0), rand_engine, ref);
    }


    std::shared_ptr<gko::ReferenceExecutor> ref;
    std::shared_ptr<const gko::CudaExecutor> cuda;
    std::ranlux48 rand_engine;
};


TEST_F(LowerTrs, CudaApplyIsEquivalentToRef)
{
    std::shared_ptr<Mtx> mtx = gen_l_mtx(50, 50);
    std::shared_ptr<Mtx> b = gen_mtx(50, 1);
    std::shared_ptr<Mtx> x = gen_mtx(50, 1);
    std::shared_ptr<CsrMtx> csr_mtx = CsrMtx::create(ref);
    mtx->convert_to(csr_mtx.get());
    std::shared_ptr<CsrMtx> d_csr_mtx = CsrMtx::create(cuda);
    auto d_x = Mtx::create(cuda);
    d_x->copy_from(x.get());
    d_csr_mtx->copy_from(csr_mtx.get());
    std::shared_ptr<Mtx> b2 = Mtx::create(ref);
    std::shared_ptr<Mtx> d_b2 = Mtx::create(cuda);
    d_b2->copy_from(b.get());
    b2->copy_from(b.get());

    auto lower_trs_factory = gko::solver::LowerTrs<>::build().on(ref);
    auto d_lower_trs_factory = gko::solver::LowerTrs<>::build().on(cuda);
    auto solver = lower_trs_factory->generate(csr_mtx);
    auto d_solver = d_lower_trs_factory->generate(d_csr_mtx);
    solver->apply(b2.get(), x.get());
    d_solver->apply(d_b2.get(), d_x.get());

    GKO_ASSERT_MTX_NEAR(d_x, x, 1e-14);
}


}  // namespace