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Attention

The vector search and clustering algorithms in RAFT are being migrated to a new library dedicated to vector search called cuVS. We will continue to support the vector search algorithms in RAFT during this move, but will no longer update them after the RAPIDS 24.06 (June) release. We plan to complete the migration by RAPIDS 24.08 (August) release.

temporary_device_buffer: Temporary raft::device_mdspan Producing Object#

#include <raft/core/temporary_device_buffer.hpp>

template<typename ElementType, typename Extents, typename LayoutPolicy = layout_c_contiguous, template<typename> typename ContainerPolicy = device_uvector_policy>
class temporary_device_buffer#
#include <temporary_device_buffer.hpp>

An object which provides temporary access on-device to memory from either a host or device pointer. This object provides a view() method that will provide a raft::device_mdspan that may be read-only depending on const-qualified nature of the input pointer.

Template Parameters:

  • ElementType – type of the input

  • Extents – raft::extents

  • LayoutPolicy – layout of the input

  • ContainerPolicy – container to be used to own device memory if needed

Public Functions

inline temporary_device_buffer(resources const &handle, ElementType *data, Extents extents, bool write_back = false)#

Construct a new temporary device buffer object.

Parameters:

  • handle – raft::resources

  • data – input pointer

  • extents – dimensions of input array

  • write_back – if true, any writes to the view() of this object will be copid back if the original pointer was in host memory

inline auto view() -> view_type#

Returns a raft::device_mdspan

Returns:

raft::device_mdspan

Factories#

template<typename ElementType, typename IndexType = std::uint32_t, typename LayoutPolicy = layout_c_contiguous, template<typename> typename ContainerPolicy = device_uvector_policy, size_t... Extents>
auto make_temporary_device_buffer(raft::resources const &handle, ElementType *data, raft::extents<IndexType, Extents...> extents, bool write_back = false)#

Factory to create a raft::temporary_device_buffer

#include <raft/core/resources.hpp>

raft::resources handle;

// Initialize raft::device_mdarray and raft::extents
// Can be either raft::device_mdarray or raft::host_mdarray
auto exts  = raft::make_extents<int>(5);
auto array = raft::make_device_mdarray<int, int>(handle, exts);

auto d_buf = raft::make_temporary_device_buffer(handle, array.data_handle(), exts);
Template Parameters:

  • ElementType – type of the input

  • IndexType – index type of raft::extents

  • LayoutPolicy – layout of the input

  • ContainerPolicy – container to be used to own device memory if needed

  • Extents – variadic dimensions for raft::extents

Parameters:

  • handle – raft::resources

  • data – input pointer

  • extents – dimensions of input array

  • write_back – if true, any writes to the view() of this object will be copid back if the original pointer was in host memory

Returns:

raft::temporary_device_buffer

template<typename ElementType, typename IndexType = std::uint32_t, typename LayoutPolicy = layout_c_contiguous, template<typename> typename ContainerPolicy = device_uvector_policy, size_t... Extents>
auto make_readonly_temporary_device_buffer(raft::resources const &handle, ElementType *data, raft::extents<IndexType, Extents...> extents)#

Factory to create a raft::temporary_device_buffer which produces a read-only raft::device_mdspan from view() method with write_back=false

#include <raft/core/resources.hpp>

raft::resources handle;

// Initialize raft::device_mdarray and raft::extents
// Can be either raft::device_mdarray or raft::host_mdarray
auto exts  = raft::make_extents<int>(5);
auto array = raft::make_device_mdarray<int, int>(handle, exts);

auto d_buf = raft::make_readonly_temporary_device_buffer(handle, array.data_handle(), exts);
Template Parameters:

  • ElementType – type of the input

  • IndexType – index type of raft::extents

  • LayoutPolicy – layout of the input

  • ContainerPolicy – container to be used to own device memory if needed

  • Extents – variadic dimensions for raft::extents

Parameters:

  • handle – raft::resources

  • data – input pointer

  • extents – dimensions of input array

Returns:

raft::temporary_device_buffer

template<typename ElementType, typename IndexType = std::uint32_t, typename LayoutPolicy = layout_c_contiguous, template<typename> typename ContainerPolicy = device_uvector_policy, size_t... Extents, typename = std::enable_if_t<not std::is_const_v<ElementType>>>
auto make_writeback_temporary_device_buffer(raft::resources const &handle, ElementType *data, raft::extents<IndexType, Extents...> extents)#

Factory to create a raft::temporary_device_buffer which produces a writeable raft::device_mdspan from view() method with write_back=true

#include <raft/core/resources.hpp>

raft::resources handle;

// Initialize raft::host_mdarray and raft::extents
// Can be either raft::device_mdarray or raft::host_mdarray
auto exts  = raft::make_extents<int>(5);
auto array = raft::make_host_mdarray<int, int>(handle, exts);

auto d_buf = raft::make_writeback_temporary_device_buffer(handle, array.data_handle(), exts);
Template Parameters:

  • ElementType – type of the input

  • IndexType – index type of raft::extents

  • LayoutPolicy – layout of the input

  • ContainerPolicy – container to be used to own device memory if needed

  • Extents – variadic dimensions for raft::extents

Parameters:

  • handle – raft::resources

  • data – input pointer

  • extents – dimensions of input array

Returns:

raft::temporary_device_buffer

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