Ginkgo Generated from branch based on main. Ginkgo version 1.9.0
A numerical linear algebra library targeting many-core architectures
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bicgstab.hpp
1// SPDX-FileCopyrightText: 2017 - 2024 The Ginkgo authors
2//
3// SPDX-License-Identifier: BSD-3-Clause
4
5#ifndef GKO_PUBLIC_CORE_SOLVER_BICGSTAB_HPP_
6#define GKO_PUBLIC_CORE_SOLVER_BICGSTAB_HPP_
7
8
9#include <vector>
10
11#include <ginkgo/core/base/array.hpp>
12#include <ginkgo/core/base/exception_helpers.hpp>
13#include <ginkgo/core/base/lin_op.hpp>
14#include <ginkgo/core/base/math.hpp>
15#include <ginkgo/core/base/types.hpp>
16#include <ginkgo/core/config/config.hpp>
17#include <ginkgo/core/config/registry.hpp>
18#include <ginkgo/core/log/logger.hpp>
19#include <ginkgo/core/matrix/dense.hpp>
20#include <ginkgo/core/matrix/identity.hpp>
21#include <ginkgo/core/solver/solver_base.hpp>
22#include <ginkgo/core/stop/combined.hpp>
23#include <ginkgo/core/stop/criterion.hpp>
24
25
26namespace gko {
32namespace solver {
33
34
50template <typename ValueType = default_precision>
52 : public EnableLinOp<Bicgstab<ValueType>>,
54 Bicgstab<ValueType>>,
55 public Transposable {
56 friend class EnableLinOp<Bicgstab>;
58
59public:
60 using value_type = ValueType;
62
63 std::unique_ptr<LinOp> transpose() const override;
64
65 std::unique_ptr<LinOp> conj_transpose() const override;
66
72 bool apply_uses_initial_guess() const override { return true; }
73
74 class Factory;
78
81
95 static parameters_type parse(const config::pnode& config,
96 const config::registry& context,
97 const config::type_descriptor& td_for_child =
98 config::make_type_descriptor<ValueType>());
99
100protected:
101 void apply_impl(const LinOp* b, LinOp* x) const override;
102
103 template <typename VectorType>
104 void apply_dense_impl(const VectorType* b, VectorType* x) const;
105
106 void apply_impl(const LinOp* alpha, const LinOp* b, const LinOp* beta,
107 LinOp* x) const override;
108
109 explicit Bicgstab(std::shared_ptr<const Executor> exec)
110 : EnableLinOp<Bicgstab>(std::move(exec))
111 {}
112
113 explicit Bicgstab(const Factory* factory,
114 std::shared_ptr<const LinOp> system_matrix)
115 : EnableLinOp<Bicgstab>(factory->get_executor(),
116 gko::transpose(system_matrix->get_size())),
117 EnablePreconditionedIterativeSolver<ValueType, Bicgstab<ValueType>>{
118 std::move(system_matrix), factory->get_parameters()},
119 parameters_{factory->get_parameters()}
120 {}
121};
122
123
124template <typename ValueType>
125struct workspace_traits<Bicgstab<ValueType>> {
127 // number of vectors used by this workspace
128 static int num_vectors(const Solver&);
129 // number of arrays used by this workspace
130 static int num_arrays(const Solver&);
131 // array containing the num_vectors names for the workspace vectors
132 static std::vector<std::string> op_names(const Solver&);
133 // array containing the num_arrays names for the workspace vectors
134 static std::vector<std::string> array_names(const Solver&);
135 // array containing all varying scalar vectors (independent of problem size)
136 static std::vector<int> scalars(const Solver&);
137 // array containing all varying vectors (dependent on problem size)
138 static std::vector<int> vectors(const Solver&);
139
140 // residual vector
141 constexpr static int r = 0;
142 // preconditioned residual vector
143 constexpr static int z = 1;
144 // y vector
145 constexpr static int y = 2;
146 // v vector
147 constexpr static int v = 3;
148 // s vector
149 constexpr static int s = 4;
150 // t vector
151 constexpr static int t = 5;
152 // p vector
153 constexpr static int p = 6;
154 // rr vector
155 constexpr static int rr = 7;
156 // alpha scalar
157 constexpr static int alpha = 8;
158 // beta scalar
159 constexpr static int beta = 9;
160 // gamma scalar
161 constexpr static int gamma = 10;
162 // previous rho scalar
163 constexpr static int prev_rho = 11;
164 // current rho scalar
165 constexpr static int rho = 12;
166 // omega scalar
167 constexpr static int omega = 13;
168 // constant 1.0 scalar
169 constexpr static int one = 14;
170 // constant -1.0 scalar
171 constexpr static int minus_one = 15;
172
173 // stopping status array
174 constexpr static int stop = 0;
175 // reduction tmp array
176 constexpr static int tmp = 1;
177};
178
179
180} // namespace solver
181} // namespace gko
182
183
184#endif // GKO_PUBLIC_CORE_SOLVER_BICGSTAB_HPP_
The EnableLinOp mixin can be used to provide sensible default implementations of the majority of the ...
Definition lin_op.hpp:879
This mixin inherits from (a subclass of) PolymorphicObject and provides a base implementation of a ne...
Definition polymorphic_object.hpp:662
Definition lin_op.hpp:117
const dim< 2 > & get_size() const noexcept
Returns the size of the operator.
Definition lin_op.hpp:210
std::shared_ptr< const Executor > get_executor() const noexcept
Returns the Executor of the object.
Definition polymorphic_object.hpp:234
Linear operators which support transposition should implement the Transposable interface.
Definition lin_op.hpp:433
pnode describes a tree of properties.
Definition property_tree.hpp:28
This class stores additional context for creating Ginkgo objects from configuration files.
Definition registry.hpp:167
This class describes the value and index types to be used when building a Ginkgo type from a configur...
Definition type_descriptor.hpp:39
Definition bicgstab.hpp:79
BiCGSTAB or the Bi-Conjugate Gradient-Stabilized is a Krylov subspace solver.
Definition bicgstab.hpp:55
std::unique_ptr< LinOp > conj_transpose() const override
Returns a LinOp representing the conjugate transpose of the Transposable object.
static parameters_type parse(const config::pnode &config, const config::registry &context, const config::type_descriptor &td_for_child=config::make_type_descriptor< ValueType >())
Create the parameters from the property_tree.
std::unique_ptr< LinOp > transpose() const override
Returns a LinOp representing the transpose of the Transposable object.
bool apply_uses_initial_guess() const override
Return true as iterative solvers use the data in x as an initial guess.
Definition bicgstab.hpp:72
A LinOp implementing this interface stores a system matrix and stopping criterion factory.
Definition solver_base.hpp:787
#define GKO_ENABLE_BUILD_METHOD(_factory_name)
Defines a build method for the factory, simplifying its construction by removing the repetitive typin...
Definition abstract_factory.hpp:394
#define GKO_ENABLE_LIN_OP_FACTORY(_lin_op, _parameters_name, _factory_name)
This macro will generate a default implementation of a LinOpFactory for the LinOp subclass it is defi...
Definition lin_op.hpp:1017
The Ginkgo namespace.
Definition abstract_factory.hpp:20
constexpr T one()
Returns the multiplicative identity for T.
Definition math.hpp:630
STL namespace.
Definition bicgstab.hpp:77
Traits class providing information on the type and location of workspace vectors inside a solver.
Definition solver_base.hpp:238