gemv¶
Computes a sparse matrix-dense vector product.
Description and Assumptions
Refer to Supported Types for a
list of supported <fp> and <intType>.
The oneapi::mkl::sparse::gemv routine computes a sparse matrix-dense vector
product defined as
where \(\alpha\) and \(\beta\) are scalars, \(x\) and \(y\) are dense vectors, A is a sparse matrix.
gemv (Buffer version)¶
Syntax
namespace oneapi::mkl::sparse {
void gemv (sycl::queue &queue,
oneapi::mkl::transpose transpose_val,
const fp alpha,
oneapi::mkl::sparse::matrix_handle_t A_handle,
sycl::buffer<fp, 1> &x,
const fp beta,
sycl::buffer<fp, 1> &y);
}
Input Parameters
- queue
Specifies the SYCL command queue which will be used for SYCL kernels execution.
- transpose_val
Specifies operation
op()on input matrix. The possible options are described in transpose 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 matrix \(\text{op}(A)\).
- beta
Specifies the scalar \(\beta\).
- y
SYCL memory object containing an array of size at least equal to the number of rows of matrix \(\text{op}(A)\).
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.
gemv (USM version)¶
Syntax
namespace oneapi::mkl::sparse {
sycl::event gemv (sycl::queue &queue,
oneapi::mkl::transpose transpose_val,
const fp alpha,
oneapi::mkl::sparse::matrix_handle_t A_handle,
const fp *x,
const fp beta,
const fp *y,
const std::vector<sycl::event> &dependencies = {});
}
Input Parameters
- queue
Specifies the SYCL command queue which will be used for SYCL kernels execution.
- transpose_val
Specifies operation
op()on input matrix. The possible options are described in transpose 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 matrix \(\text{op}(A)\).
- beta
Specifies the scalar \(\beta\).
- y
Device-accessible USM object containing an array of size at least equal to the number of rows of matrix \(\text{op}(A)\).
- dependencies
List of events that oneapi::mkl::sparse::gemv 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 gemv routine.
Parent topic: Sparse BLAS