topic dense-sparse matrice multiplication in Intel® oneAPI Math Kernel Library

dense-sparse matrice multiplication

Vahid_Jalili — Tue, 12 Apr 2011 00:40:44 GMT

Hi all,

I want to multiply a dens matrix A into a sparse matrix B, that is saved in the CSC format, as c=AxB. I cannot usemkl_scscmm() becsue it computes BxA. (i.e. the sparse matrix must be the left one)

Could you let me know which sparse routine I can use for this purpose?

Thanks

dense-sparse matrice multiplication

Sergey_P_Intel2 — Tue, 12 Apr 2011 08:40:21 GMT

Hi Vahid,

For multiplication dense matrix A by sparse one B you can use mkl_scscmm() taking into account that A x B = (B^t x A^t)^t, where ^t means transposition of the matrix. So the matrix A should be transposed before calling mkl_scscmm(), and the result of mkl_scscmm() should be transposed, too.

Regards,

Sergey

dense-sparse matrice multiplication

Vahid_Jalili — Tue, 12 Apr 2011 12:49:12 GMT

Thanks Sergey for your reply. I found it very helpful.