symv¶
Computes a sparse matrix-dense vector product for a symmetric part of the sparse matrix.
Description and Assumptions
Refer to Supported Types for a
list of supported <fp> and <intType>.
The oneapi::mkl::sparse::symv routine computes a sparse matrix-dense vector
product over a symmetric part defined as
where:
\(\alpha\) and \(\beta\) are scalars, \(x\) and \(y\) are dense vectors, A is a sparse matrix.
symv (Buffer version)¶
Syntax
namespace oneapi::mkl::sparse {
void symv (sycl::queue &queue,
oneapi::mkl::uplo uplo_val,
fp alpha,
oneapi::mkl::sparse::matrix_handle_t A_handle,
sycl::buffer<fp, 1> &x,
fp beta,
sycl::buffer<fp, 1> &y);
}
Input Parameters
- queue
Specifies the SYCL command queue which will be used for SYCL kernels execution.
- uplo_val
Specifies which part is to be processed. The possible options are described in uplo enum class.
- alpha
Specifies the scalar \(\alpha\).
- A_handle
Handle to object containing sparse matrix \(A\). Created using the oneapi::mkl::sparse::set_csr_data routine.
- x
SYCL memory object containing an array of size at least equal to the number of columns of \(A\) matrix.
- beta
Specifies the scalar \(\beta\).
- y
SYCL memory object containing an array of size at least equal to the number of rows of \(A\) matrix.
Output Parameters
- y
Overwritten by the updated vector
y.
Throws
This routine shall throw the following exceptions if the associated condition is detected. An implementation may throw additional implementation-specific exception(s) in case of error conditions not covered here.
symv (USM version)¶
Syntax
namespace oneapi::mkl::sparse {
sycl::event symv (sycl::queue &queue,
oneapi::mkl::uplo uplo_val,
fp alpha,
oneapi::mkl::sparse::matrix_handle_t A_handle,
fp *x,
fp beta,
fp *y,
const std::vector<sycl::event> &dependencies = {});
}
Input Parameters
- queue
Specifies the SYCL command queue which will be used for SYCL kernels execution.
- uplo_val
Specifies which part is to be processed. The possible options are described in uplo enum class.
- alpha
Specifies the scalar \(\alpha\).
- A_handle
Handle to object containing sparse matrix \(A\). Created using the oneapi::mkl::sparse::set_csr_data routine.
- x
Device-accessible USM object containing an array of size at least equal to the number of columns of \(A\) matrix.
- beta
Specifies the scalar \(\beta\).
- y
Device-accessible USM object containing an array of size at least equal to the number of rows of \(A\) matrix.
- dependencies
List of events that oneapi::mkl::sparse::symv routine depends on. If omitted, defaults to no dependencies.
Output Parameters
- y
Overwritten by the updated vector
y.
Throws
This routine shall throw the following exceptions if the associated condition is detected. An implementation may throw additional implementation-specific exception(s) in case of error conditions not covered here.
Return Values
Output event that can be waited upon or added as a dependency for the completion of symv routine.
Parent topic: Sparse BLAS