Csr is a general sparse matrix format that stores the column indices for each nonzero entry and a cumulative sum of the number of nonzeros in each row. More...

#include <ginkgo/core/matrix/batch_csr.hpp>

Inheritance diagram for gko::batch::matrix::Csr< ValueType, IndexType >:

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Collaboration diagram for gko::batch::matrix::Csr< ValueType, IndexType >:

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Public Types
using	value_type = ValueType

using	index_type = IndexType

using	unbatch_type = gko::matrix::Csr< value_type, index_type >

using	absolute_type = remove_complex< Csr >

using	complex_type = to_complex< Csr >

Public Types inherited from gko::EnablePolymorphicAssignment< Csr< ValueType, IndexType > >
using	result_type = Csr< ValueType, IndexType >

Public Types inherited from gko::ConvertibleTo< Csr< ValueType, IndexType > >
using	result_type = Csr< ValueType, IndexType >

Public Types inherited from gko::ConvertibleTo< Csr< next_precision< ValueType >, IndexType > >
using	result_type = Csr< next_precision< ValueType >, IndexType >

Public Member Functions
void	convert_to (Csr< next_precision< ValueType >, IndexType > *result) const override

void	move_to (Csr< next_precision< ValueType >, IndexType > *result) override

std::unique_ptr< unbatch_type >	create_view_for_item (size_type item_id)
	Creates a mutable view (of matrix::Csr type) of one item of the batch::matrix::Csr<value_type> object. More...

std::unique_ptr< const unbatch_type >	create_const_view_for_item (size_type item_id) const
	Creates a mutable view (of matrix::Csr type) of one item of the batch::matrix::Csr<value_type> object. More...

value_type *	get_values () noexcept
	Returns a pointer to the array of values of the matrix. More...

const value_type *	get_const_values () const noexcept
	Returns a pointer to the array of values of the matrix. More...

index_type *	get_col_idxs () noexcept
	Returns a pointer to the array of column indices of the matrix. More...

const index_type *	get_const_col_idxs () const noexcept
	Returns a pointer to the array of column indices of the matrix. More...

index_type *	get_row_ptrs () noexcept
	Returns a pointer to the array of row pointers of the matrix. More...

const index_type *	get_const_row_ptrs () const noexcept
	Returns a pointer to the array of row pointers of the matrix. More...

size_type	get_num_stored_elements () const noexcept
	Returns the number of elements explicitly stored in the batch matrix, cumulative across all the batch items. More...

size_type	get_num_elements_per_item () const noexcept
	Returns the number of stored elements in each batch item. More...

value_type *	get_values_for_item (size_type batch_id) noexcept
	Returns a pointer to the array of values of the matrix for a specific batch item. More...

const value_type *	get_const_values_for_item (size_type batch_id) const noexcept
	Returns a pointer to the array of values of the matrix for a specific batch item. More...

Csr *	apply (ptr_param< const MultiVector< value_type >> b, ptr_param< MultiVector< value_type >> x)
	Apply the matrix to a multi-vector. More...

Csr *	apply (ptr_param< const MultiVector< value_type >> alpha, ptr_param< const MultiVector< value_type >> b, ptr_param< const MultiVector< value_type >> beta, ptr_param< MultiVector< value_type >> x)
	Apply the matrix to a multi-vector with a linear combination of the given input vector. More...

const Csr *	apply (ptr_param< const MultiVector< value_type >> b, ptr_param< MultiVector< value_type >> x) const

const Csr *	apply (ptr_param< const MultiVector< value_type >> alpha, ptr_param< const MultiVector< value_type >> b, ptr_param< const MultiVector< value_type >> beta, ptr_param< MultiVector< value_type >> x) const

void	scale (const array< value_type > &row_scale, const array< value_type > &col_scale)
	Performs in-place row and column scaling for this matrix. More...

void	add_scaled_identity (ptr_param< const MultiVector< value_type >> alpha, ptr_param< const MultiVector< value_type >> beta)
	Performs the operation this = alphaI + betathis. More...

Public Member Functions inherited from gko::EnableAbstractPolymorphicObject< Csr< ValueType, IndexType >, BatchLinOp >
std::unique_ptr< Csr< ValueType, IndexType > >	create_default (std::shared_ptr< const Executor > exec) const

std::unique_ptr< Csr< ValueType, IndexType > >	create_default () const

std::unique_ptr< Csr< ValueType, IndexType > >	clone (std::shared_ptr< const Executor > exec) const

std::unique_ptr< Csr< ValueType, IndexType > >	clone () const

Csr< ValueType, IndexType > *	copy_from (const PolymorphicObject *other)

std::enable_if_t< std::is_base_of< PolymorphicObject, std::decay_t< Derived > >::value, Csr< ValueType, IndexType > > *	copy_from (std::unique_ptr< Derived > &&other)

std::enable_if_t< std::is_base_of< PolymorphicObject, std::decay_t< Derived > >::value, Csr< ValueType, IndexType > > *	copy_from (const std::unique_ptr< Derived > &other)

Csr< ValueType, IndexType > *	copy_from (const std::shared_ptr< const PolymorphicObject > &other)

Csr< ValueType, IndexType > *	move_from (ptr_param< PolymorphicObject > other)

Csr< ValueType, IndexType > *	clear ()

Public Member Functions inherited from gko::EnablePolymorphicAssignment< Csr< ValueType, IndexType > >
void	convert_to (result_type *result) const override
	Converts the implementer to an object of type result_type. More...

void	move_to (result_type *result) override
	Converts the implementer to an object of type result_type by moving data from this object. More...

Public Member Functions inherited from gko::ConvertibleTo< Csr< ValueType, IndexType > >
void	convert_to (ptr_param< result_type > result) const

void	move_to (ptr_param< result_type > result)

Public Member Functions inherited from gko::ConvertibleTo< Csr< next_precision< ValueType >, IndexType > >
virtual void	convert_to (result_type *result) const=0
	Converts the implementer to an object of type result_type. More...

void	convert_to (ptr_param< result_type > result) const

virtual void	move_to (result_type *result)=0
	Converts the implementer to an object of type result_type by moving data from this object. More...

void	move_to (ptr_param< result_type > result)

Static Public Member Functions
static std::unique_ptr< Csr >	create (std::shared_ptr< const Executor > exec, const batch_dim< 2 > &size=batch_dim< 2 >{}, size_type num_nonzeros_per_item={})
	Creates an uninitialized Csr matrix of the specified size. More...

static std::unique_ptr< Csr >	create (std::shared_ptr< const Executor > exec, const batch_dim< 2 > &size, array< value_type > values, array< index_type > col_idxs, array< index_type > row_ptrs)
	Creates a Csr matrix from an already allocated (and initialized) array. More...

template<typename InputValueType , typename ColIndexType , typename RowPtrType >
static std::unique_ptr< Csr >	create (std::shared_ptr< const Executor > exec, const batch_dim< 2 > &size, std::initializer_list< InputValueType > values, std::initializer_list< ColIndexType > col_idxs, std::initializer_list< RowPtrType > row_ptrs)
	create(std::shared_ptr<const Executor>, More...

static std::unique_ptr< const Csr >	create_const (std::shared_ptr< const Executor > exec, const batch_dim< 2 > &sizes, gko::detail::const_array_view< value_type > &&values, gko::detail::const_array_view< index_type > &&col_idxs, gko::detail::const_array_view< index_type > &&row_ptrs)
	Creates a constant (immutable) batch csr matrix from a constant array. More...

Friends
class	EnablePolymorphicObject< Csr, BatchLinOp >

class	Csr< to_complex< ValueType >, IndexType >

class	Csr< next_precision< ValueType >, IndexType >

Detailed Description

template<typename ValueType = default_precision, typename IndexType = int32>
class gko::batch::matrix::Csr< ValueType, IndexType >

Csr is a general sparse matrix format that stores the column indices for each nonzero entry and a cumulative sum of the number of nonzeros in each row.

It is one of the most popular sparse matrix formats due to its versatility and ability to store a wide range of sparsity patterns in an efficient fashion.

Note: It is assumed that the sparsity pattern of all the items in the batch is the same and therefore only a single copy of the sparsity pattern is stored.; Currently only IndexType of int32 is supported.

Template Parameters

ValueType	value precision of matrix elements
IndexType	index precision of matrix elements

Member Function Documentation

◆ add_scaled_identity()

template<typename ValueType = default_precision, typename IndexType = int32>

void gko::batch::matrix::Csr< ValueType, IndexType >::add_scaled_identity	(	ptr_param< const MultiVector< value_type >>	alpha,
		ptr_param< const MultiVector< value_type >>	beta
	)

Performs the operation this = alpha*I + beta*this.

Parameters

alpha	the scalar for identity
beta	the scalar to multiply this matrix

Note: Performs the operation in-place for this batch matrix; This operation fails in case this matrix does not have all its diagonal entries.

◆ apply() [1/4]

template<typename ValueType = default_precision, typename IndexType = int32>

Csr* gko::batch::matrix::Csr< ValueType, IndexType >::apply	(	ptr_param< const MultiVector< value_type >>	alpha,
		ptr_param< const MultiVector< value_type >>	b,
		ptr_param< const MultiVector< value_type >>	beta,
		ptr_param< MultiVector< value_type >>	x
	)

Apply the matrix to a multi-vector with a linear combination of the given input vector.

Represents the matrix vector multiplication, x = alpha * A

b + beta * x, where x and b are both multi-vectors.

Parameters

alpha	the scalar to scale the matrix-vector product with
b	the multi-vector to be applied to
beta	the scalar to scale the x vector with
x	the output multi-vector

◆ apply() [2/4]

template<typename ValueType = default_precision, typename IndexType = int32>

const Csr* gko::batch::matrix::Csr< ValueType, IndexType >::apply	(	ptr_param< const MultiVector< value_type >>	alpha,
		ptr_param< const MultiVector< value_type >>	b,
		ptr_param< const MultiVector< value_type >>	beta,
		ptr_param< MultiVector< value_type >>	x
	)		const

◆ apply() [3/4]

template<typename ValueType = default_precision, typename IndexType = int32>

Csr* gko::batch::matrix::Csr< ValueType, IndexType >::apply	(	ptr_param< const MultiVector< value_type >>	b,
		ptr_param< MultiVector< value_type >>	x
	)

Apply the matrix to a multi-vector.

Represents the matrix vector multiplication, x = A * b, where x and b are both multi-vectors.

Parameters

b	the multi-vector to be applied to
x	the output multi-vector

◆ apply() [4/4]

template<typename ValueType = default_precision, typename IndexType = int32>

const Csr* gko::batch::matrix::Csr< ValueType, IndexType >::apply	(	ptr_param< const MultiVector< value_type >>	b,
		ptr_param< MultiVector< value_type >>	x
	)		const

◆ create() [1/3]

template<typename ValueType = default_precision, typename IndexType = int32>

static std::unique_ptr<Csr> gko::batch::matrix::Csr< ValueType, IndexType >::create	(	std::shared_ptr< const Executor >	exec,
		const batch_dim< 2 > &	size,
		array< value_type >	values,
		array< index_type >	col_idxs,
		array< index_type >	row_ptrs
	)

static

Creates a Csr matrix from an already allocated (and initialized) array.

The column indices array needs to be the same for all batch items.

Parameters

exec	Executor associated to the matrix
size	size of the matrix
values	array of matrix values
col_idxs	the col_idxs array of a single batch item of the matrix.
row_ptrs	the row_ptrs array of a single batch item of the matrix.

Note: If values is not an rvalue, not an array of ValueType, or is on the wrong executor, an internal copy will be created, and the original array data will not be used in the matrix.

Returns: A smart pointer to the newly created matrix.

◆ create() [2/3]

template<typename ValueType = default_precision, typename IndexType = int32>

template<typename InputValueType , typename ColIndexType , typename RowPtrType >

static std::unique_ptr<Csr> gko::batch::matrix::Csr< ValueType, IndexType >::create	(	std::shared_ptr< const Executor >	exec,
		const batch_dim< 2 > &	size,
		std::initializer_list< InputValueType >	values,
		std::initializer_list< ColIndexType >	col_idxs,
		std::initializer_list< RowPtrType >	row_ptrs
	)

inlinestatic

create(std::shared_ptr<const Executor>,

create(std::shared_ptr<const Executor>, const batch_dim<2>&, array<value_type>, array<index_type>, array<index_type>)

References gko::batch::matrix::Csr< ValueType, IndexType >::create().

◆ create() [3/3]

template<typename ValueType = default_precision, typename IndexType = int32>

static std::unique_ptr<Csr> gko::batch::matrix::Csr< ValueType, IndexType >::create	(	std::shared_ptr< const Executor >	exec,
		const batch_dim< 2 > &	size = `batch_dim< 2 >{}`,
		size_type	num_nonzeros_per_item = `{}`
	)

static

Creates an uninitialized Csr matrix of the specified size.

Parameters

exec	Executor associated to the matrix
size	size of the matrix
num_nonzeros_per_item	number of nonzeros in each item of the batch matrix

Referenced by gko::batch::matrix::Csr< ValueType, IndexType >::create().

◆ create_const()

template<typename ValueType = default_precision, typename IndexType = int32>

static std::unique_ptr<const Csr> gko::batch::matrix::Csr< ValueType, IndexType >::create_const	(	std::shared_ptr< const Executor >	exec,
		const batch_dim< 2 > &	sizes,
		gko::detail::const_array_view< value_type > &&	values,
		gko::detail::const_array_view< index_type > &&	col_idxs,
		gko::detail::const_array_view< index_type > &&	row_ptrs
	)

static

Creates a constant (immutable) batch csr matrix from a constant array.

Only a single sparsity pattern (column indices and row pointers) is stored and hence the user needs to ensure that each batch item has the same sparsity pattern.

Parameters

exec	the executor to create the matrix on
size	the dimensions of the matrix
values	the value array of the matrix
col_idxs	the col_idxs array of a single batch item of the matrix.
row_ptrs	the row_ptrs array of a single batch item of the matrix.

Returns: A smart pointer to the constant matrix wrapping the input array (if it resides on the same executor as the matrix) or a copy of the array on the correct executor.; A smart pointer to the newly created matrix.

◆ create_const_view_for_item()

template<typename ValueType = default_precision, typename IndexType = int32>

std::unique_ptr<const unbatch_type> gko::batch::matrix::Csr< ValueType, IndexType >::create_const_view_for_item ( size_type item_id ) const

Creates a mutable view (of matrix::Csr type) of one item of the batch::matrix::Csr<value_type> object.

Does not perform any deep copies, but only returns a view of the data.

Parameters

item_id The index of the batch item

Returns: a batch::matrix::Csr object with the data from the batch item at the given index.

◆ create_view_for_item()

template<typename ValueType = default_precision, typename IndexType = int32>

std::unique_ptr<unbatch_type> gko::batch::matrix::Csr< ValueType, IndexType >::create_view_for_item ( size_type item_id )

Creates a mutable view (of matrix::Csr type) of one item of the batch::matrix::Csr<value_type> object.

Does not perform any deep copies, but only returns a view of the data.

Parameters

item_id The index of the batch item

Returns: a batch::matrix::Csr object with the data from the batch item at the given index.

◆ get_col_idxs()

template<typename ValueType = default_precision, typename IndexType = int32>

index_type* gko::batch::matrix::Csr< ValueType, IndexType >::get_col_idxs ( )

inlinenoexcept

Returns a pointer to the array of column indices of the matrix.

Returns: the pointer to the array of column indices

References gko::array< ValueType >::get_data().

◆ get_const_col_idxs()

template<typename ValueType = default_precision, typename IndexType = int32>

const index_type* gko::batch::matrix::Csr< ValueType, IndexType >::get_const_col_idxs ( ) const

inlinenoexcept

Returns a pointer to the array of column indices of the matrix.

Returns: the pointer to the array of column indices

Note: This is the constant version of the function, which can be significantly more memory efficient than the non-constant version, so always prefer this version.

References gko::array< ValueType >::get_const_data().

◆ get_const_row_ptrs()

template<typename ValueType = default_precision, typename IndexType = int32>

const index_type* gko::batch::matrix::Csr< ValueType, IndexType >::get_const_row_ptrs ( ) const

inlinenoexcept

Returns a pointer to the array of row pointers of the matrix.

Returns: the pointer to the array of row pointers

Note: This is the constant version of the function, which can be significantly more memory efficient than the non-constant version, so always prefer this version.

References gko::array< ValueType >::get_const_data().

◆ get_const_values()

template<typename ValueType = default_precision, typename IndexType = int32>

const value_type* gko::batch::matrix::Csr< ValueType, IndexType >::get_const_values ( ) const

inlinenoexcept

Returns a pointer to the array of values of the matrix.

Returns: the pointer to the array of values

Note: This is the constant version of the function, which can be significantly more memory efficient than the non-constant version, so always prefer this version.

References gko::array< ValueType >::get_const_data().

◆ get_const_values_for_item()

template<typename ValueType = default_precision, typename IndexType = int32>

const value_type* gko::batch::matrix::Csr< ValueType, IndexType >::get_const_values_for_item ( size_type batch_id ) const

inlinenoexcept

Returns a pointer to the array of values of the matrix for a specific batch item.

Parameters

batch_id the id of the batch item.

Returns: the pointer to the array of values

Note: This is the constant version of the function, which can be significantly more memory efficient than the non-constant version, so always prefer this version.

References gko::array< ValueType >::get_const_data(), gko::batch::matrix::Csr< ValueType, IndexType >::get_num_elements_per_item(), and gko::array< ValueType >::get_size().

◆ get_num_elements_per_item()

template<typename ValueType = default_precision, typename IndexType = int32>

size_type gko::batch::matrix::Csr< ValueType, IndexType >::get_num_elements_per_item ( ) const

inlinenoexcept

Returns the number of stored elements in each batch item.

Returns: the number of stored elements per batch item.

References gko::batch::matrix::Csr< ValueType, IndexType >::get_num_stored_elements().

Referenced by gko::batch::matrix::Csr< ValueType, IndexType >::get_const_values_for_item(), and gko::batch::matrix::Csr< ValueType, IndexType >::get_values_for_item().

◆ get_num_stored_elements()

template<typename ValueType = default_precision, typename IndexType = int32>

size_type gko::batch::matrix::Csr< ValueType, IndexType >::get_num_stored_elements ( ) const

inlinenoexcept

Returns the number of elements explicitly stored in the batch matrix, cumulative across all the batch items.

Returns: the number of elements explicitly stored in the vector, cumulative across all the batch items

References gko::array< ValueType >::get_size().

Referenced by gko::batch::matrix::Csr< ValueType, IndexType >::get_num_elements_per_item().

◆ get_row_ptrs()

template<typename ValueType = default_precision, typename IndexType = int32>

index_type* gko::batch::matrix::Csr< ValueType, IndexType >::get_row_ptrs ( )

inlinenoexcept

Returns a pointer to the array of row pointers of the matrix.

Returns: the pointer to the array of row pointers

References gko::array< ValueType >::get_data().

◆ get_values()

template<typename ValueType = default_precision, typename IndexType = int32>

value_type* gko::batch::matrix::Csr< ValueType, IndexType >::get_values ( )

inlinenoexcept

Returns a pointer to the array of values of the matrix.

Returns: the pointer to the array of values

References gko::array< ValueType >::get_data().

◆ get_values_for_item()

template<typename ValueType = default_precision, typename IndexType = int32>

value_type* gko::batch::matrix::Csr< ValueType, IndexType >::get_values_for_item ( size_type batch_id )

inlinenoexcept

Returns a pointer to the array of values of the matrix for a specific batch item.

Parameters

batch_id the id of the batch item.

Returns: the pointer to the array of values

References gko::array< ValueType >::get_data(), gko::batch::matrix::Csr< ValueType, IndexType >::get_num_elements_per_item(), and gko::array< ValueType >::get_size().

◆ scale()

template<typename ValueType = default_precision, typename IndexType = int32>

void gko::batch::matrix::Csr< ValueType, IndexType >::scale	(	const array< value_type > &	row_scale,
		const array< value_type > &	col_scale
	)

Performs in-place row and column scaling for this matrix.

Parameters

row_scale	the row scalars
col_scale	the column scalars

The documentation for this class was generated from the following file:

ginkgo/core/matrix/batch_csr.hpp

Public Types

Public Member Functions

Static Public Member Functions

Friends

Detailed Description

template<typename ValueType = default_precision, typename IndexType = int32> class gko::batch::matrix::Csr< ValueType, IndexType >

Member Function Documentation

◆ add_scaled_identity()

◆ apply() [1/4]

◆ apply() [2/4]

◆ apply() [3/4]

◆ apply() [4/4]

◆ create() [1/3]

◆ create() [2/3]

◆ create() [3/3]

◆ create_const()

◆ create_const_view_for_item()

◆ create_view_for_item()

◆ get_col_idxs()

◆ get_const_col_idxs()

◆ get_const_row_ptrs()

◆ get_const_values()

◆ get_const_values_for_item()

◆ get_num_elements_per_item()

◆ get_num_stored_elements()

◆ get_row_ptrs()

◆ get_values()

◆ get_values_for_item()

◆ scale()

template<typename ValueType = default_precision, typename IndexType = int32>
class gko::batch::matrix::Csr< ValueType, IndexType >