gko::matrix::Permutation< IndexType > Class Template Reference

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::EnablePolymorphicAssignment< Permutation< int32 > >
using	result_type
Public Types inherited from gko::WritableToMatrixData< default_precision, int32 >
using	value_type
using	index_type

Public Member Functions
index_type *	get_permutation () noexcept
	Returns a pointer to the array of permutation.
const index_type *	get_const_permutation () const noexcept
	Returns a pointer to the array of permutation.
size_type	get_permutation_size () const noexcept
	Returns the number of elements explicitly stored in the permutation array.
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.
std::unique_ptr< Permutation >	compose (ptr_param< const Permutation > other) const
	Composes this permutation with another permutation.
void	write (gko::matrix_data< value_type, index_type > &data) const override
Public Member Functions inherited from gko::EnableLinOp< Permutation< int32 > >
const Permutation< int32 > *	apply (ptr_param< const LinOp > b, ptr_param< LinOp > x) const
Public Member Functions inherited from gko::EnablePolymorphicAssignment< Permutation< int32 > >
void	convert_to (result_type *result) const override
void	move_to (result_type *result) override
Public Member Functions inherited from gko::WritableToMatrixData< default_precision, int32 >
virtual void	write (matrix_data< default_precision, int32 > &data) const=0
	Writes a matrix to a matrix_data structure.

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.
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.
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.
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.

Friends
class	EnablePolymorphicObject< Permutation, LinOp >

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: means .

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 and 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>

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>

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>

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>

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.

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.

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.

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

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