Add chebyshev Iteration

common/unified/CMakeLists.txt

@@ -25,6 +25,7 @@ set(UNIFIED_SOURCES
     solver/bicgstab_kernels.cpp
     solver/cg_kernels.cpp
     solver/cgs_kernels.cpp
+    solver/chebyshev_kernels.cpp
     solver/common_gmres_kernels.cpp
     solver/fcg_kernels.cpp
     solver/gcr_kernels.cpp

common/unified/solver/chebyshev_kernels.cpp

@@ -0,0 +1,114 @@
+// SPDX-FileCopyrightText: 2025 The Ginkgo authors
+//
+// SPDX-License-Identifier: BSD-3-Clause
+
+#include "core/solver/chebyshev_kernels.hpp"
+
+#include <type_traits>
+
+#include <ginkgo/core/base/std_extensions.hpp>
+#include <ginkgo/core/matrix/dense.hpp>
+#include <ginkgo/core/solver/chebyshev.hpp>
+
+#include "common/unified/base/kernel_launch.hpp"
+
+
+namespace gko {
+namespace kernels {
+namespace GKO_DEVICE_NAMESPACE {
+namespace chebyshev {
+
+
+#if GINKGO_DPCPP_SINGLE_MODE
+
+
+// we only change type in device code to keep the interface is the same as the
+// other backend.
+template <typename coeff_type>
+using if_single_only_type =
+    std::conditional_t<std::is_same_v<coeff_type, double>, float,
+                       std::complex<float>>;
+
+
+#else
+
+
+template <typename coeff_type>
+using if_single_only_type = xstd::type_identity_t<coeff_type>;
+
+
+#endif
+
+
+template <typename ValueType>
+void init_update(std::shared_ptr<const DefaultExecutor> exec,
+                 const solver::detail::coeff_type<ValueType> alpha,
+                 const matrix::Dense<ValueType>* inner_sol,
+                 matrix::Dense<ValueType>* update_sol,
+                 matrix::Dense<ValueType>* output)
+{
+    using coeff_type =
+        if_single_only_type<solver::detail::coeff_type<ValueType>>;
+    // the coeff_type always be the highest precision, so we need
+    // to cast the others from ValueType to this precision.
+    using arithmetic_type = device_type<coeff_type>;
+
+    auto alpha_val = static_cast<coeff_type>(alpha);
+
+    run_kernel(
+        exec,
+        [] GKO_KERNEL(auto row, auto col, auto alpha, auto inner_sol,
+                      auto update_sol, auto output) {
+            const auto inner_val =
+                static_cast<arithmetic_type>(inner_sol(row, col));
+            update_sol(row, col) =
+                static_cast<device_type<ValueType>>(inner_val);
+            output(row, col) = static_cast<device_type<ValueType>>(
+                static_cast<arithmetic_type>(output(row, col)) +
+                alpha * inner_val);
+        },
+        output->get_size(), alpha_val, inner_sol, update_sol, output);
+}
+
+GKO_INSTANTIATE_FOR_EACH_VALUE_TYPE(GKO_DECLARE_CHEBYSHEV_INIT_UPDATE_KERNEL);
+
+
+template <typename ValueType>
+void update(std::shared_ptr<const DefaultExecutor> exec,
+            const solver::detail::coeff_type<ValueType> alpha,
+            const solver::detail::coeff_type<ValueType> beta,
+            matrix::Dense<ValueType>* inner_sol,
+            matrix::Dense<ValueType>* update_sol,
+            matrix::Dense<ValueType>* output)
+{
+    using coeff_type =
+        if_single_only_type<solver::detail::coeff_type<ValueType>>;
+    // the coeff_type always be the highest precision, so we need
+    // to cast the others from ValueType to this precision.
+    using arithmetic_type = device_type<coeff_type>;
+
+    auto alpha_val = static_cast<coeff_type>(alpha);
+    auto beta_val = static_cast<coeff_type>(beta);
+
+    run_kernel(
+        exec,
+        [] GKO_KERNEL(auto row, auto col, auto alpha, auto beta, auto inner_sol,
+                      auto update_sol, auto output) {
+            const auto val =
+                static_cast<arithmetic_type>(inner_sol(row, col)) +
+                beta * static_cast<arithmetic_type>(update_sol(row, col));
+            inner_sol(row, col) = static_cast<device_type<ValueType>>(val);
+            update_sol(row, col) = static_cast<device_type<ValueType>>(val);
+            output(row, col) = static_cast<device_type<ValueType>>(
+                static_cast<arithmetic_type>(output(row, col)) + alpha * val);
+        },
+        output->get_size(), alpha_val, beta_val, inner_sol, update_sol, output);
+}
+
+GKO_INSTANTIATE_FOR_EACH_VALUE_TYPE(GKO_DECLARE_CHEBYSHEV_UPDATE_KERNEL);
+
+
+}  // namespace chebyshev
+}  // namespace GKO_DEVICE_NAMESPACE
+}  // namespace kernels
+}  // namespace gko

core/CMakeLists.txt

@@ -93,8 +93,8 @@ target_sources(
         matrix/scaled_permutation.cpp
         matrix/sellp.cpp
         matrix/sparsity_csr.cpp
-        multigrid/pgm.cpp
         multigrid/fixed_coarsening.cpp
+        multigrid/pgm.cpp
         preconditioner/batch_jacobi.cpp
         preconditioner/gauss_seidel.cpp
         preconditioner/sor.cpp
@@ -113,6 +113,7 @@ target_sources(
         solver/cb_gmres.cpp
         solver/cg.cpp
         solver/cgs.cpp
+        solver/chebyshev.cpp
         solver/direct.cpp
         solver/fcg.cpp
         solver/gcr.cpp

core/config/config_helper.hpp

@@ -24,10 +24,9 @@ namespace gko {
 namespace config {
 
 
-#define GKO_INVALID_CONFIG_VALUE(_entry, _value)                            \
-    GKO_INVALID_STATE(std::string("The value >" + _value +                  \
-                                  "< is invalid for the entry >" + _entry + \
-                                  "<"))
+#define GKO_INVALID_CONFIG_VALUE(_entry, _value)            \
+    GKO_INVALID_STATE(std::string("The value >") + _value + \
+                      "< is invalid for the entry >" + _entry + "<")
 
 
 #define GKO_MISSING_CONFIG_ENTRY(_entry) \
@@ -53,6 +52,7 @@ enum class LinOpFactoryType : int {
     Direct,
     LowerTrs,
     UpperTrs,
+    Chebyshev,
     Factorization_Ic,
     Factorization_Ilu,
     Cholesky,

core/config/registry.cpp

@@ -33,6 +33,7 @@ configuration_map generate_config_map()
             {"solver::Direct", parse<LinOpFactoryType::Direct>},
             {"solver::LowerTrs", parse<LinOpFactoryType::LowerTrs>},
             {"solver::UpperTrs", parse<LinOpFactoryType::UpperTrs>},
+            {"solver::Chebyshev", parse<LinOpFactoryType::Chebyshev>},
             {"factorization::Ic", parse<LinOpFactoryType::Factorization_Ic>},
             {"factorization::Ilu", parse<LinOpFactoryType::Factorization_Ilu>},
             {"factorization::Cholesky", parse<LinOpFactoryType::Cholesky>},

core/config/solver_config.cpp

@@ -12,6 +12,7 @@
 #include <ginkgo/core/solver/cb_gmres.hpp>
 #include <ginkgo/core/solver/cg.hpp>
 #include <ginkgo/core/solver/cgs.hpp>
+#include <ginkgo/core/solver/chebyshev.hpp>
 #include <ginkgo/core/solver/direct.hpp>
 #include <ginkgo/core/solver/fcg.hpp>
 #include <ginkgo/core/solver/gcr.hpp>
@@ -45,6 +46,7 @@
 GKO_PARSE_VALUE_AND_INDEX_TYPE(Direct, gko::experimental::solver::Direct);
 GKO_PARSE_VALUE_AND_INDEX_TYPE(LowerTrs, gko::solver::LowerTrs);
 GKO_PARSE_VALUE_AND_INDEX_TYPE(UpperTrs, gko::solver::UpperTrs);
+GKO_PARSE_VALUE_TYPE(Chebyshev, gko::solver::Chebyshev);
 
 
 template <>

core/device_hooks/common_kernels.inc.cpp

@@ -63,6 +63,7 @@
 #include "core/solver/cb_gmres_kernels.hpp"
 #include "core/solver/cg_kernels.hpp"
 #include "core/solver/cgs_kernels.hpp"
+#include "core/solver/chebyshev_kernels.hpp"
 #include "core/solver/common_gmres_kernels.hpp"
 #include "core/solver/fcg_kernels.hpp"
 #include "core/solver/gcr_kernels.hpp"
@@ -677,6 +678,16 @@
 }  // namespace cb_gmres
 
 
+namespace chebyshev {
+
+
+GKO_STUB_VALUE_TYPE(GKO_DECLARE_CHEBYSHEV_INIT_UPDATE_KERNEL);
+GKO_STUB_VALUE_TYPE(GKO_DECLARE_CHEBYSHEV_UPDATE_KERNEL);
+
+
+}  // namespace chebyshev
+
+
 namespace ir {