Permutation is a matrix format that represents a permutation matrix, i.e. More...

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

Inheritance diagram for gko::matrix::Permutation< IndexType >:

Collaboration diagram for gko::matrix::Permutation< IndexType >:

Public Types
using	value_type = default_precision

using	index_type = IndexType

Public Types inherited from gko::EnableCloneable< ConcreteType >
using	result_type = ConcreteType

Public Types inherited from gko::ConvertibleTo< ConcreteType >
using	result_type = ConcreteType

Public Types inherited from gko::WritableToMatrixData< default_precision, IndexType >
using	value_type = default_precision

using	index_type = IndexType

Public Member Functions
index_type *	get_permutation () noexcept
	Returns a pointer to the array of permutation. More...

const index_type *	get_const_permutation () const noexcept
	Returns a pointer to the array of permutation. More...

size_type	get_permutation_size () const noexcept
	Returns the number of elements explicitly stored in the permutation array. More...

mask_type	get_permute_mask () const

void	set_permute_mask (mask_type permute_mask)

std::unique_ptr< Permutation >	compute_inverse () const
	Returns the inverse permutation. More...

std::unique_ptr< Permutation >	compose (ptr_param< const Permutation > other) const
	Composes this permutation with another permutation. More...

void	write (gko::matrix_data< value_type, index_type > &data) const override
	Writes a matrix to a matrix_data structure. More...

Public Member Functions inherited from gko::LinOp
void	apply (ptr_param< const LinOp > b, ptr_param< LinOp > x) const
	Applies a linear operator to a vector (or a sequence of vectors). More...

void	apply (ptr_param< const LinOp > alpha, ptr_param< const LinOp > b, ptr_param< const LinOp > beta, ptr_param< LinOp > x) const
	Performs the operation x = alpha * op(b) + beta * x. More...

const dim< 2 > &	get_size () const noexcept
	Returns the size of the operator. More...

virtual bool	apply_uses_initial_guess () const
	Returns true if the linear operator uses the data given in x as an initial guess. More...

LinOp &	operator= (const LinOp &)=default
	Copy-assigns a LinOp. More...

LinOp &	operator= (LinOp &&other)
	Move-assigns a LinOp. More...

	LinOp (const LinOp &)=default
	Copy-constructs a LinOp. More...

	LinOp (LinOp &&other)
	Move-constructs a LinOp. More...

Public Member Functions inherited from gko::PolymorphicObject
PolymorphicObject &	operator= (const PolymorphicObject &)

std::shared_ptr< const Executor >	get_executor () const noexcept
	Returns the Executor of the object. More...

Public Member Functions inherited from gko::log::EnableLogging< PolymorphicObject >
void	add_logger (std::shared_ptr< const Logger > logger) override

void	remove_logger (const Logger *logger) override

void	remove_logger (ptr_param< const Logger > logger)

const std::vector< std::shared_ptr< const Logger > > &	get_loggers () const override

void	clear_loggers () override

Public Member Functions inherited from gko::log::Loggable
void	remove_logger (ptr_param< const Logger > logger)

Public Member Functions inherited from gko::EnableCloneable< ConcreteType >
std::unique_ptr< ConcreteType >	clone (std::shared_ptr< const Executor > exec) const
	Creates a clone of the object. More...

std::unique_ptr< ConcreteType >	clone () const
	Creates a clone of the object. More...

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...

std::unique_ptr< ConcreteType >	create_default () const

std::unique_ptr< ConcreteType >	create_default (std::shared_ptr< const Executor > exec) const

Public Member Functions inherited from gko::ConvertibleTo< ConcreteType >
void	convert_to (ptr_param< result_type > result) const

void	move_to (ptr_param< result_type > result)

Public Member Functions inherited from gko::Cloneable
std::unique_ptr< Cloneable >	clone (std::shared_ptr< const Executor > exec) const

std::unique_ptr< Cloneable >	clone () const

Cloneable *	copy_from (ptr_param< const Cloneable > other)

Cloneable *	move_from (ptr_param< Cloneable > other)

std::unique_ptr< Cloneable >	create_default (std::shared_ptr< const Executor > exec) const

std::unique_ptr< Cloneable >	create_default () const

Static Public Member Functions
static std::unique_ptr< Permutation >	create (std::shared_ptr< const Executor > exec, size_type size=0)
	Creates an uninitialized Permutation arrays on the specified executor. More...

static std::unique_ptr< Permutation >	create (std::shared_ptr< const Executor > exec, array< IndexType > permutation_indices)
	Creates a Permutation matrix from an already allocated (and initialized) row and column permutation arrays. More...

static std::unique_ptr< Permutation >	create (std::shared_ptr< const Executor > exec, const dim< 2 > &size)

static std::unique_ptr< Permutation >	create (std::shared_ptr< const Executor > exec, const dim< 2 > &size, const mask_type &enabled_permute)

static std::unique_ptr< Permutation >	create (std::shared_ptr< const Executor > exec, const dim< 2 > &size, array< IndexType > permutation_indices)

static std::unique_ptr< Permutation >	create (std::shared_ptr< const Executor > exec, const dim< 2 > &size, array< index_type > permutation_indices, const mask_type &enabled_permute)

static std::unique_ptr< const Permutation >	create_const (std::shared_ptr< const Executor > exec, size_type size, gko::detail::const_array_view< IndexType > &&perm_idxs, mask_type enabled_permute=row_permute)
	Creates a constant (immutable) Permutation matrix from a constant array. More...

static std::unique_ptr< const Permutation >	create_const (std::shared_ptr< const Executor > exec, gko::detail::const_array_view< IndexType > &&perm_idxs)
	Creates a constant (immutable) Permutation matrix from a constant array. More...

Friends
class	EnableCloneable< Permutation< IndexType > >

Detailed Description

template<typename IndexType = int32>
class gko::matrix::Permutation< IndexType >

Permutation is a matrix format that represents a permutation matrix, i.e.

a matrix where each row and column has exactly one entry. The matrix can only be applied to Dense inputs, where it represents a row permutation: $A' = PA$ means $A'(i, j) = A(p[i], j)$ .

Template Parameters

IndexType precision of permutation array indices.

Member Function Documentation

◆ compose()

template<typename IndexType = int32>

std::unique_ptr<Permutation> gko::matrix::Permutation< IndexType >::compose ( ptr_param< const Permutation< IndexType > > other ) const

Composes this permutation with another permutation.

The resulting permutation fulfills result[i] = this[other[i]] or result = other * this from the matrix perspective, which is equivalent to first permuting by this and then by other: Combining permutations $P_1$ and $P_2$ with P = P_1.combine(P_2) performs the operation permute(A, P) = permute(permute(A, P_1), P_2).

Parameters

other the other permutation

Returns: the combined permutation

◆ compute_inverse()

template<typename IndexType = int32>

std::unique_ptr<Permutation> gko::matrix::Permutation< IndexType >::compute_inverse ( ) const

Returns the inverse permutation.

Returns: a newly created Permutation object storing the inverse permutation of this Permutation.

◆ create() [1/2]

template<typename IndexType = int32>

static std::unique_ptr<Permutation> gko::matrix::Permutation< IndexType >::create	(	std::shared_ptr< const Executor >	exec,
		array< IndexType >	permutation_indices
	)

static

Creates a Permutation matrix from an already allocated (and initialized) row and column permutation arrays.

Parameters

exec	Executor associated to the matrix
size	size of the permutation array.
permutation_indices	array of permutation array
enabled_permute	mask for the type of permutation to apply.

Note: If permutation_indices is not an rvalue, not an array of IndexType, 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() [2/2]

template<typename IndexType = int32>

static std::unique_ptr<Permutation> gko::matrix::Permutation< IndexType >::create	(	std::shared_ptr< const Executor >	exec,
		size_type	size = `0`
	)

static

Creates an uninitialized Permutation arrays on the specified executor.

Parameters

exec	Executor associated to the LinOp

Returns: A smart pointer to the newly created matrix.

◆ create_const() [1/2]

template<typename IndexType = int32>

static std::unique_ptr<const Permutation> gko::matrix::Permutation< IndexType >::create_const	(	std::shared_ptr< const Executor >	exec,
		gko::detail::const_array_view< IndexType > &&	perm_idxs
	)

static

Creates a constant (immutable) Permutation matrix from a constant array.

Parameters

exec	the executor to create the matrix on
size	the size of the square matrix
perm_idxs	the permutation index array of the matrix
enabled_permute	the mask describing the type of permutation

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.

◆ create_const() [2/2]

template<typename IndexType = int32>

static std::unique_ptr<const Permutation> gko::matrix::Permutation< IndexType >::create_const	(	std::shared_ptr< const Executor >	exec,
		size_type	size,
		gko::detail::const_array_view< IndexType > &&	perm_idxs,
		mask_type	enabled_permute = `row_permute`
	)

static

Creates a constant (immutable) Permutation matrix from a constant array.

Parameters

exec	the executor to create the matrix on
size	the size of the square matrix
perm_idxs	the permutation index array of the matrix
enabled_permute	the mask describing the type of permutation

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.

◆ get_const_permutation()

template<typename IndexType = int32>

const index_type* gko::matrix::Permutation< IndexType >::get_const_permutation ( ) const

inlinenoexcept

Returns a pointer to the array of permutation.

Returns: the pointer to the row permutation array.

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_permutation()

template<typename IndexType = int32>

index_type* gko::matrix::Permutation< IndexType >::get_permutation ( )

inlinenoexcept

Returns a pointer to the array of permutation.

Returns: the pointer to the row permutation array.

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

◆ get_permutation_size()

template<typename IndexType = int32>

size_type gko::matrix::Permutation< IndexType >::get_permutation_size ( ) const

noexcept

Returns the number of elements explicitly stored in the permutation array.

Returns: the number of elements explicitly stored in the permutation array.

◆ write()

template<typename IndexType = int32>

void gko::matrix::Permutation< IndexType >::write ( gko::matrix_data< value_type, index_type > & data ) const

overridevirtual

Writes a matrix to a matrix_data structure.

Parameters

data	the matrix_data structure

Implements gko::WritableToMatrixData< default_precision, IndexType >.

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

ginkgo/core/matrix/csr.hpp
ginkgo/core/matrix/permutation.hpp

Public Types

Public Member Functions

Static Public Member Functions

Friends

Detailed Description

template<typename IndexType = int32> class gko::matrix::Permutation< IndexType >

Member Function Documentation

◆ compose()

◆ compute_inverse()

◆ create() [1/2]

◆ create() [2/2]

◆ create_const() [1/2]

◆ create_const() [2/2]

◆ get_const_permutation()

◆ get_permutation()

◆ get_permutation_size()

◆ write()

template<typename IndexType = int32>
class gko::matrix::Permutation< IndexType >