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Visible to Intel only — GUID: GUID-ACA94C30-B447-440E-849E-6A4028B31C94
Visible to Intel only — GUID: GUID-ACA94C30-B447-440E-849E-6A4028B31C94
oneapi::mkl::sparse::gemv
Computes a sparse matrix-dense vector product.
Description
The oneapi::mkl::sparse::gemv routine computes a sparse matrix-dense vector product defined as
where 
and 
are scalars, 
is a general sparse matrix of dimensions num_rows rows and num_cols columns and 
is a matrix modifier:
The dense vectors 
and 
are appropriately sized based on matrix product dimensions of 
.
API
Syntax
Using SYCL buffers:
namespace oneapi::mkl::sparse { void gemv ( sycl::queue &queue, oneapi::mkl::transpose opA, const DATA_TYPE alpha, oneapi::mkl::sparse::matrix_handle_t A, sycl::buffer<DATA_TYPE, 1> &x, const DATA_TYPE beta, sycl::buffer<DATA_TYPE, 1> &y) }
Using USM pointers:
namespace oneapi::mkl::sparse { sycl::event gemv ( sycl::queue &queue, oneapi::mkl::transpose opA, const DATA_TYPE alpha, oneapi::mkl::sparse::matrix_handle_t A, const DATA_TYPE *x, DATA_TYPE beta, DATA_TYPE *y, const std::vector<sycl::event> &dependencies= {}) }
Include Files
oneapi/mkl/spblas.hpp
Input Parameters
- queue
-
Specifies the SYCL command queue which will be used for SYCL kernels execution.
- opA
-
Specifies operation op() on input matrix.
oneapi::mkl::transpose::nontrans
Non-transpose,
.oneapi::mkl::transpose::trans
Transpose,
.oneapi::mkl::transpose::conjtrans
Conjugate transpose,
. - alpha
-
Specifies the scalar,
. - A
-
Handle to object containing sparse matrix and other internal data. Created using one of the oneapi::mkl::sparse::set_<sparse_matrix_type>_data routines.
NOTE:The supported cases for <sparse_matrix_type> are csr and coo on both CPU and GPU devices. - x
-
SYCL buffer or device-accessible USM pointer of size at least equal to the number of columns of input matrix if opA = oneapi::mkl::transpose::nontrans and at least the number of rows of input matrix otherwise.
- beta
-
Specifies the scalar,
. - y
-
SYCL buffer or device-accessible USM pointer of size at least equal to the number of rows of the input matrix if opA = oneapi::mkl::transpose::nontrans and at least the number of columns of the input matrix otherwise.
- dependencies
-
A vector of type std::vector<sycl::event> containing the list of events that the oneapi::mkl::sparse::gemv routine depends on.
Output Parameters
- y
-
Overwritten by the updated vector
.
Return Values (USM Only)
- sycl::event
-
SYCL event which can be waited upon or added as a dependency for the completion of the gemv routine.
Examples
An example of how to use oneapi::mkl::sparse::gemv with SYCL buffers or USM pointers can be found in the oneMKL installation directory, under:
share/doc/mkl/examples/sycl/sparse_blas/source/coo_gemv.cpp
share/doc/mkl/examples/sycl/sparse_blas/source/csr_gemv_usm.cpp