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// SPDX-FileCopyrightText: Copyright © DUNE Project contributors, see file LICENSE.md in module root
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception
#ifndef DUNE_PYTHON_UTILITY_VECTORCOMMDATAHANDLE_HH
#define DUNE_PYTHON_UTILITY_VECTORCOMMDATAHANDLE_HH
#include <cassert>
#include <cstddef>
#include <algorithm>
#include <type_traits>
#include <utility>
#include <dune/common/visibility.hh>
#include <dune/geometry/type.hh>
#include <dune/grid/common/datahandleif.hh>
#include <dune/python/pybind11/numpy.h>
#include <dune/python/pybind11/pybind11.h>
namespace Dune
{
// External Forward Declarations
// -----------------------------
template< class >
class MultipleCodimMultipleGeomTypeMapper;
namespace Python
{
// NumPyCommDataHandle
// -------------------
template< class Mapper, class T, class Function >
class NumPyCommDataHandle;
template< class GV, class T, class Function >
class DUNE_PRIVATE NumPyCommDataHandle< MultipleCodimMultipleGeomTypeMapper< GV >, T, Function >
: public CommDataHandleIF< NumPyCommDataHandle< MultipleCodimMultipleGeomTypeMapper< GV >, T, Function >, T >
{
typedef NumPyCommDataHandle< MultipleCodimMultipleGeomTypeMapper< GV >, T, Function > This;
typedef MultipleCodimMultipleGeomTypeMapper< GV > Mapper;
public:
NumPyCommDataHandle ( const Mapper &mapper, std::vector< pybind11::array_t< T > > arrays, Function function = Function() )
: mapper_( mapper ), buffers_( arrays.size() ), function_( function )
{
std::transform( arrays.begin(), arrays.end(), buffers_.begin(), [] ( pybind11::array_t< T > &a ) { return a.request(); } );
itemSize_ = 0;
for( const pybind11::buffer_info &buffer : buffers_ )
{
if( static_cast< std::size_t >( buffer.shape[ 0 ] ) != mapper_.size() )
pybind11::value_error( "Array does not match mapper in construction of NumPyCommDataHandle." );
itemSize_ += std::accumulate( buffer.shape.begin()+1, buffer.shape.end(), std::size_t( 1 ), std::multiplies< std::size_t >() );
}
}
NumPyCommDataHandle ( const Mapper &mapper, pybind11::array_t< T > array, Function function = Function() )
: NumPyCommDataHandle( mapper, std::vector< pybind11::array_t< T > >{ array }, function )
{}
bool contains ( int dim, int codim ) const
{
const auto &types = mapper_.types( codim );
return std::any_of( types.begin(), types.end(), [ this ] ( GeometryType gt ) { return mapper_.size( gt ) > 0; } );
}
bool fixedSize ( int dim, int codim ) const
{
const auto &types = mapper_.types( codim );
return (std::adjacent_find( types.begin(), types.end(), [ this ] ( GeometryType a, GeometryType b ) { return mapper_.size( a ) != mapper_.size( b ); } ) == types.end());
}
template< class Entity >
std::size_t size ( const Entity &entity ) const
{
return mapper_.size( entity.type() ) * itemSize_;
}
template< class CommBuffer, class Entity >
void gather ( CommBuffer &commBuffer, const Entity &entity ) const
{
for( const pybind11::buffer_info &buffer : buffers_ )
for( const auto index : mapper_.indices( entity ) )
gather( commBuffer, buffer, 1, index*buffer.strides[ 0 ] );
}
template< class CommBuffer, class Entity >
void scatter ( CommBuffer &commBuffer, const Entity &entity, std::size_t n )
{
assert( n == size( entity ) );
for( const pybind11::buffer_info &buffer : buffers_ )
for( const auto index : mapper_.indices( entity ) )
scatter( commBuffer, buffer, 1, index*buffer.strides[ 0 ] );
}
private:
template< class CommBuffer >
void gather ( CommBuffer &commBuffer, const pybind11::buffer_info &buffer, ssize_t dim, ssize_t pos ) const
{
if( dim < buffer.ndim )
{
for( ssize_t i = 0; i < buffer.shape[ dim ]; ++i )
gather( commBuffer, buffer, dim+1, pos + i*buffer.strides[ dim ] );
}
else
commBuffer.write( *reinterpret_cast< T * >( static_cast< char * >( buffer.ptr ) + pos ) );
}
template< class CommBuffer >
void scatter ( CommBuffer &commBuffer, const pybind11::buffer_info &buffer, ssize_t dim, ssize_t pos )
{
if( dim < buffer.ndim )
{
for( ssize_t i = 0; i < buffer.shape[ dim ]; ++i )
scatter( commBuffer, buffer, dim+1, pos + i*buffer.strides[ dim ] );
}
else
{
T &local = *reinterpret_cast< T * >( static_cast< char * >( buffer.ptr ) + pos );
T remote;
commBuffer.read( remote );
local = function_( local, remote );
}
}
const Mapper &mapper_;
std::vector< pybind11::buffer_info > buffers_;
std::size_t itemSize_;
Function function_;
};
// vectorCommDataHandle
// --------------------
template< class Mapper, class T, class Function >
inline static NumPyCommDataHandle< Mapper, T, Function >
numPyCommDataHandle ( const Mapper &mapper, pybind11::array_t< T > array, Function function )
{
return NumPyCommDataHandle< Mapper, T, Function >( mapper, std::move( array ), std::move( function ) );
}
template< class Mapper, class T, class Function >
inline static NumPyCommDataHandle< Mapper, T, Function >
numPyCommDataHandle( const Mapper &mapper, std::vector<pybind11::array_t< T >> array, Function function )
{
return NumPyCommDataHandle< Mapper, T, Function >( mapper, std::move( array ), std::move( function ) );
}
template< class Mapper, class T, class Function, class... options >
void registerDataHandle ( pybind11::handle module, pybind11::class_< NumPyCommDataHandle< Mapper, T, Function >, options... > cls )
{
cls.def( pybind11::init( [] ( Mapper &mapper, pybind11::array_t< T > array, Function function ) {
return NumPyCommDataHandle< Mapper, T, Function >( mapper, array, function );
} ), pybind11::keep_alive< 1, 2 >() );
cls.def( pybind11::init( [] ( Mapper &mapper, std::vector< pybind11::array_t< T > > arrays, Function function ) {
return NumPyCommDataHandle< Mapper, T, Function >( mapper, arrays, function );
} ), pybind11::keep_alive< 1, 2 >() );
}
} // namespace Python
} // namespace Dune
#endif // #ifndef DUNE_PYTHON_UTILITY_VECTORCOMMDATAHANDLE_HH
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