Intel® oneAPI Math Kernel Library (oneMKL) - Data Parallel C++ Developer Reference
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Visible to Intel only — GUID: GUID-6FB4B8A9-F5B9-4505-B1BC-B43F2D4446B6
oneapi::mkl::sparse::gemvdot
Computes a sparse matrix-dense vector product with dot product.
Description
The oneapi::mkl::sparse::gemvdot routine computes a sparse matrix-dense vector product and dot product defined as
where 
is a general sparse matrix, 
, 
, and 
are scalars, 
and 
are dense vectors and 
is a matrix modifier:
API
Syntax
Using SYCL buffers:
namespace oneapi::mkl::sparse {
void gemvdot (
sycl::queue &queue,
oneapi::mkl::transpose transpose_flag,
const fp alpha,
oneapi::mkl::sparse::matrix_handle_t handle,
sycl::buffer<fp, 1> &x,
const fp beta,
sycl::buffer<fp, 1> &y,
sycl::buffer<fp, 1> &d)
}
Using USM pointers:
namespace oneapi::mkl::sparse {
sycl::event gemvdot (
sycl::queue &queue,
oneapi::mkl::transpose transpose_flag,
const fp alpha,
oneapi::mkl::sparse::matrix_handle_t handle,
fp *x,
const fp beta,
fp *y,
fp *d,
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.
- transpose_flag
-
Specifies operation op() on input matrix.
oneapi::mkl::transpose::nontrans
Non-transpose,
.oneapi::mkl::transpose::trans
Transpose,
.oneapi::mkl::transpose::conjtrans
Conjugate transpose,
.NOTE:Currently, the only supported case for operation is oneapi::mkl::transpose::nontrans. - alpha
-
Specifies the scalar,
. - handle
-
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:Currently, the only supported case for <sparse_matrix_type> is csr. - x
-
SYCL buffer or device-accessible USM pointer of size at least equal to the number of columns of input matrix if transpose_flag == 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 transpose_flag == 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::gemvdot routine depends on.
Output Parameters
- y
-
Overwritten by the updated vector
. - d
-
Overwritten by the dot product of
and .
Return Values
- sycl::event
-
SYCL event which can be waited upon or added as a dependency for the completion of the gemvdot routine.
Examples
An example of how to use oneapi::mkl::sparse::gemvdot with SYCL buffers can be found in the oneMKL installation directory, under:
examples/dpcpp/sparse_blas/source/sparse_gemvdot.cpp