oneapi::mkl::sparse::update_diagonal

oneMKL - Data Parallel C++ Developer Reference

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ID 772045

Date 3/31/2025

Version

Public

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oneapi::mkl::sparse::update_diagonal_values

Changes the values of the entries on the main diagonal of a sparse matrix. This routine also updates any data structures related to optimizations that have already been done (such as with oneapi::mkl::sparse::optimize_trsv or oneapi::mkl::sparse::optimize_gemv).

Description
API

Description

The oneapi::mkl::sparse::update_diagonal_values routine changes the values of the entries on the main diagonal of a sparse matrix. The existing sparse structure must already have all diagonal entries included in the sparsity pattern.

NOTE:

Refer to Error Handling for a detailed description of the possible exceptions thrown.

API

Syntax

Using SYCL buffers:

 namespace oneapi::mkl::sparse {
     void update_diagonal_values(
         sycl::queue &queue,
         oneapi::mkl::sparse::matrix_handle_t spMat,
         sycl::buffer<DATA_TYPE, 1> &new_diag_values);
}

Using USM pointers:

 namespace oneapi::mkl::sparse {
     sycl::event update_diagonal_values(
         sycl::queue &queue,
         oneapi::mkl::sparse::matrix_handle_t spMat,
         std::int64_t length,
         const DATA_TYPE* new_diag_values,
         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.
spMat: 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. Only GPU device is currently supported.
new_diag_values: SYCL buffer or device-accessible USM pointer of size at least equal to the smaller of the number of rows and number of columns of the input matrix.
length: Length of the input vector new_diag_values. Must be at least equal to the smaller of the number of rows and number of columns of the input matrix.
dependencies: A vector of type std::vector<sycl::event> containing the list of events that the oneapi::mkl::sparse::update_diagonal_values routine depends on.

Return Values (USM Only)

sycl::event: SYCL event which can be waited upon or added as a dependency for the completion of the update_diagonal_values routine.

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oneMKL - Data Parallel C++ Developer Reference

oneapi::mkl::sparse::update_diagonal_values

Description

API