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A numerical linear algebra library targeting many-core architectures
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jacobi.hpp
1// SPDX-FileCopyrightText: 2017 - 2024 The Ginkgo authors
2//
3// SPDX-License-Identifier: BSD-3-Clause
4
5#ifndef GKO_PUBLIC_CORE_PRECONDITIONER_JACOBI_HPP_
6#define GKO_PUBLIC_CORE_PRECONDITIONER_JACOBI_HPP_
7
8
9#include <ginkgo/core/base/array.hpp>
10#include <ginkgo/core/base/lin_op.hpp>
11#include <ginkgo/core/config/config.hpp>
12#include <ginkgo/core/config/registry.hpp>
13#include <ginkgo/core/matrix/csr.hpp>
14#include <ginkgo/core/matrix/dense.hpp>
15#include <ginkgo/core/matrix/diagonal.hpp>
16
17
18namespace gko {
24namespace preconditioner {
25
26
27// TODO: replace this with a custom accessor
36template <typename IndexType>
39
45 {}
46
50 IndexType block_offset;
51
55 IndexType group_offset;
56
63
69 GKO_ATTRIBUTES IndexType get_group_size() const noexcept
70 {
71 return one<IndexType>() << group_power;
72 }
73
86 GKO_ATTRIBUTES size_type
87 compute_storage_space(size_type num_blocks) const noexcept
88 {
89 return (num_blocks + 1 == size_type{0})
90 ? size_type{0}
91 : ceildiv(num_blocks, this->get_group_size()) * group_offset;
92 }
93
101 GKO_ATTRIBUTES IndexType get_group_offset(IndexType block_id) const noexcept
102 {
103 return group_offset * (block_id >> group_power);
104 }
105
113 GKO_ATTRIBUTES IndexType get_block_offset(IndexType block_id) const noexcept
114 {
115 return block_offset * (block_id & (this->get_group_size() - 1));
116 }
117
125 GKO_ATTRIBUTES IndexType
126 get_global_block_offset(IndexType block_id) const noexcept
127 {
128 return this->get_group_offset(block_id) +
129 this->get_block_offset(block_id);
130 }
131
137 GKO_ATTRIBUTES IndexType get_stride() const noexcept
138 {
139 return block_offset << group_power;
140 }
141};
142
143
186template <typename ValueType = default_precision, typename IndexType = int32>
187class Jacobi : public EnableLinOp<Jacobi<ValueType, IndexType>>,
188 public ConvertibleTo<matrix::Dense<ValueType>>,
189 public WritableToMatrixData<ValueType, IndexType>,
190 public Transposable {
191 friend class EnableLinOp<Jacobi>;
192 friend class EnablePolymorphicObject<Jacobi, LinOp>;
193
194public:
195 using EnableLinOp<Jacobi>::convert_to;
196 using EnableLinOp<Jacobi>::move_to;
197 using ConvertibleTo<matrix::Dense<ValueType>>::convert_to;
199 using value_type = ValueType;
200 using index_type = IndexType;
203
212 size_type get_num_blocks() const noexcept { return num_blocks_; }
213
223 const noexcept
224 {
225 return storage_scheme_;
226 }
227
239 const value_type* get_blocks() const noexcept
240 {
241 return blocks_.get_const_data();
242 }
243
254 {
255 return conditioning_.get_const_data();
256 }
257
264 {
265 return blocks_.get_size();
266 }
267
268 void convert_to(matrix::Dense<value_type>* result) const override;
269
270 void move_to(matrix::Dense<value_type>* result) override;
271
272 void write(mat_data& data) const override;
273
274 std::unique_ptr<LinOp> transpose() const override;
275
276 std::unique_ptr<LinOp> conj_transpose() const override;
277
282 Jacobi& operator=(const Jacobi& other);
283
290
295 Jacobi(const Jacobi& other);
296
302 Jacobi(Jacobi&& other);
303
305 {
315
326
344 bool GKO_FACTORY_PARAMETER_SCALAR(skip_sorting, false);
345
372 nullptr);
373
374 private:
375 // See documentation of storage_optimization parameter for details about
376 // this class
377 struct storage_optimization_type {
378 storage_optimization_type(precision_reduction p)
379 : is_block_wise{false}, of_all_blocks{p}
380 {}
381
382 storage_optimization_type(
383 const array<precision_reduction>& block_wise_opt)
384 : is_block_wise{block_wise_opt.get_size() > 0},
385 block_wise{block_wise_opt}
386 {}
387
388 storage_optimization_type(
389 array<precision_reduction>&& block_wise_opt)
390 : is_block_wise{block_wise_opt.get_size() > 0},
391 block_wise{std::move(block_wise_opt)}
392 {}
393
394 operator precision_reduction() { return of_all_blocks; }
395
396 bool is_block_wise;
397 precision_reduction of_all_blocks;
399 };
400
401 public:
469 storage_optimization_type GKO_FACTORY_PARAMETER_VECTOR(
470 storage_optimization, precision_reduction(0, 0));
471
499 accuracy, static_cast<remove_complex<value_type>>(1e-1));
500 };
503
521 const config::pnode& config, const config::registry& context,
522 const config::type_descriptor& td_for_child =
523 config::make_type_descriptor<ValueType, IndexType>());
524
525protected:
531 explicit Jacobi(std::shared_ptr<const Executor> exec)
532 : EnableLinOp<Jacobi>(exec),
533 num_blocks_{},
534 blocks_(exec),
535 conditioning_(exec)
536 {
537 parameters_.block_pointers.set_executor(exec);
538 parameters_.storage_optimization.block_wise.set_executor(exec);
539 }
540
548 explicit Jacobi(const Factory* factory,
549 std::shared_ptr<const LinOp> system_matrix)
550 : EnableLinOp<Jacobi>(factory->get_executor(),
551 gko::transpose(system_matrix->get_size())),
552 parameters_{factory->get_parameters()},
553 storage_scheme_{this->compute_storage_scheme(
554 parameters_.max_block_size, parameters_.max_block_stride)},
555 num_blocks_{parameters_.block_pointers.get_size() - 1},
556 blocks_(factory->get_executor(),
557 storage_scheme_.compute_storage_space(
558 parameters_.block_pointers.get_size() - 1)),
559 conditioning_(factory->get_executor())
560 {
561 parameters_.block_pointers.set_executor(this->get_executor());
562 parameters_.storage_optimization.block_wise.set_executor(
563 this->get_executor());
564 this->generate(system_matrix.get(), parameters_.skip_sorting);
565 }
566
575 block_interleaved_storage_scheme<index_type> compute_storage_scheme(
576 uint32 max_block_size, uint32 param_max_block_stride)
577 {
578 uint32 default_block_stride = 32;
579 // If the executor is hip, the warp size is 32 or 64
580 if (auto hip_exec = std::dynamic_pointer_cast<const gko::HipExecutor>(
581 this->get_executor())) {
582 default_block_stride = hip_exec->get_warp_size();
583 }
584 uint32 max_block_stride = default_block_stride;
585 if (param_max_block_stride != 0) {
586 // if parameter max_block_stride is not zero, set max_block_stride =
587 // param_max_block_stride
588 max_block_stride = param_max_block_stride;
589 if (this->get_executor() != this->get_executor()->get_master() &&
590 max_block_stride != default_block_stride) {
591 // only support the default value on the gpu device
592 GKO_NOT_SUPPORTED(this);
593 }
594 }
595 if (parameters_.max_block_size > max_block_stride ||
596 parameters_.max_block_size < 1) {
597 GKO_NOT_SUPPORTED(this);
598 }
599 const auto group_size = static_cast<uint32>(
600 max_block_stride / get_superior_power(uint32{2}, max_block_size));
601 const auto block_offset = max_block_size;
602 const auto block_stride = group_size * block_offset;
603 const auto group_offset = max_block_size * block_stride;
604 return {static_cast<index_type>(block_offset),
605 static_cast<index_type>(group_offset),
606 get_significant_bit(group_size)};
607 }
608
618 void generate(const LinOp* system_matrix, bool skip_sorting);
619
627 void detect_blocks(const matrix::Csr<ValueType, IndexType>* system_matrix);
628
629 void apply_impl(const LinOp* b, LinOp* x) const override;
630
631 void apply_impl(const LinOp* alpha, const LinOp* b, const LinOp* beta,
632 LinOp* x) const override;
633
634private:
635 block_interleaved_storage_scheme<index_type> storage_scheme_{};
636 size_type num_blocks_;
637 array<value_type> blocks_;
639};
640
641
642} // namespace preconditioner
643} // namespace gko
644
645
646#endif // GKO_PUBLIC_CORE_PRECONDITIONER_JACOBI_HPP_
ConvertibleTo interface is used to mark that the implementer can be converted to the object of Result...
Definition polymorphic_object.hpp:470
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
LinOp(const LinOp &)=default
Copy-constructs a LinOp.
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
A LinOp implementing this interface can write its data to a matrix_data structure.
Definition lin_op.hpp:660
An array is a container which encapsulates fixed-sized arrays, stored on the Executor tied to the arr...
Definition logger.hpp:25
const value_type * get_const_data() const noexcept
Returns a constant pointer to the block of memory used to store the elements of the array.
Definition array.hpp:682
void set_executor(std::shared_ptr< const Executor > exec)
Changes the Executor of the array, moving the allocated data to the new Executor.
Definition array.hpp:700
size_type get_size() const noexcept
Returns the number of elements in the array.
Definition array.hpp:656
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
Dense is a matrix format which explicitly stores all values of the matrix.
Definition sparsity_csr.hpp:25
This class is used to encode storage precisions of low precision algorithms.
Definition types.hpp:238
Definition jacobi.hpp:501
A block-Jacobi preconditioner is a block-diagonal linear operator, obtained by inverting the diagonal...
Definition jacobi.hpp:190
const block_interleaved_storage_scheme< index_type > & get_storage_scheme() const noexcept
Returns the storage scheme used for storing Jacobi blocks.
Definition jacobi.hpp:222
std::unique_ptr< LinOp > conj_transpose() const override
Returns a LinOp representing the conjugate transpose of the Transposable object.
Jacobi(const Jacobi &other)
Copy-constructs a Jacobi preconditioner.
const remove_complex< value_type > * get_conditioning() const noexcept
Returns an array of 1-norm condition numbers of the blocks.
Definition jacobi.hpp:253
Jacobi(Jacobi &&other)
Move-assigns a Jacobi preconditioner.
static parameters_type parse(const config::pnode &config, const config::registry &context, const config::type_descriptor &td_for_child=config::make_type_descriptor< ValueType, IndexType >())
Create the parameters from the property_tree.
std::unique_ptr< LinOp > transpose() const override
Returns a LinOp representing the transpose of the Transposable object.
const value_type * get_blocks() const noexcept
Returns the pointer to the memory used for storing the block data.
Definition jacobi.hpp:239
Jacobi & operator=(Jacobi &&other)
Move-assigns a Jacobi preconditioner.
Jacobi & operator=(const Jacobi &other)
Copy-assigns a Jacobi preconditioner.
size_type get_num_stored_elements() const noexcept
Returns the number of elements explicitly stored in the matrix.
Definition jacobi.hpp:263
size_type get_num_blocks() const noexcept
Returns the number of blocks of the operator.
Definition jacobi.hpp:212
#define GKO_CREATE_FACTORY_PARAMETERS(_parameters_name, _factory_name)
This Macro will generate a new type containing the parameters for the factory _factory_name.
Definition abstract_factory.hpp:280
#define GKO_FACTORY_PARAMETER_SCALAR(_name, _default)
Creates a scalar factory parameter in the factory parameters structure.
Definition abstract_factory.hpp:445
#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
#define GKO_FACTORY_PARAMETER_VECTOR(_name,...)
Creates a vector factory parameter in the factory parameters structure.
Definition abstract_factory.hpp:461
The Ginkgo namespace.
Definition abstract_factory.hpp:20
constexpr T one()
Returns the multiplicative identity for T.
Definition math.hpp:630
typename detail::remove_complex_s< T >::type remove_complex
Obtain the type which removed the complex of complex/scalar type or the template parameter of class b...
Definition math.hpp:260
constexpr uint32 get_significant_bit(const T &n, uint32 hint=0u) noexcept
Returns the position of the most significant bit of the number.
Definition math.hpp:1009
std::uint32_t uint32
32-bit unsigned integral type.
Definition types.hpp:129
constexpr int64 ceildiv(int64 num, int64 den)
Performs integer division with rounding up.
Definition math.hpp:590
std::size_t size_type
Integral type used for allocation quantities.
Definition types.hpp:89
constexpr T get_superior_power(const T &base, const T &limit, const T &hint=T{1}) noexcept
Returns the smallest power of base not smaller than limit.
Definition math.hpp:1027
@ array
The matrix should be written as dense matrix in column-major order.
STL namespace.
This structure is used as an intermediate data type to store a sparse matrix.
Definition matrix_data.hpp:126
storage_optimization_type storage_optimization
The precisions to use for the blocks of the matrix.
Definition jacobi.hpp:470
uint32 max_block_size
Maximal size of diagonal blocks.
Definition jacobi.hpp:314
gko::array< index_type > block_pointers
Starting (row / column) indexes of individual blocks.
Definition jacobi.hpp:372
bool skip_sorting
true means it is known that the matrix given to this factory will be sorted first by row,...
Definition jacobi.hpp:344
Defines the parameters of the interleaved block storage scheme used by block-Jacobi blocks.
Definition jacobi.hpp:37
IndexType get_block_offset(IndexType block_id) const noexcept
Returns the offset of the block with the given ID within its group.
Definition jacobi.hpp:113
IndexType get_group_offset(IndexType block_id) const noexcept
Returns the offset of the group belonging to the block with the given ID.
Definition jacobi.hpp:101
uint32 group_power
Then base 2 power of the group.
Definition jacobi.hpp:62
IndexType get_stride() const noexcept
Returns the stride between columns of the block.
Definition jacobi.hpp:137
IndexType group_offset
The offset between two block groups.
Definition jacobi.hpp:55
IndexType get_global_block_offset(IndexType block_id) const noexcept
Returns the offset of the block with the given ID.
Definition jacobi.hpp:126
IndexType block_offset
The offset between consecutive blocks within the group.
Definition jacobi.hpp:50
size_type compute_storage_space(size_type num_blocks) const noexcept
Computes the storage space required for the requested number of blocks.
Definition jacobi.hpp:87
IndexType get_group_size() const noexcept
Returns the number of elements in the group.
Definition jacobi.hpp:69