Compress matrix in CSR Format after matrix multiplication

andrefla — Wed, 18 Aug 2010 07:10:40 GMT

Hello,

is there an easy way (or a predefined function) to compress a matrix in CSR format after a matrix multiplication?

I have two problems:

a) I have to set the number of non zero elements in advance, but I don't know the exact number of non zero elements after the matrix multiplication. So I have to assume the worst case, which is alway higher than the real one.

b) During matrix multiplication there can be zeros introduced, which enlarges my matrix.

The only way I know is, that I can walk through the values array "by hand", delete all zeros and correct all indices in the corresponding index arrays. But that's really exhausting ...

All the best,

Andr

Edit:

I said nothing. I should read the manual twice: Callmkl_?csrmultcsr first with request=1 and after that with request=2

Compress matrix in CSR Format after matrix multiplication

Gennady_F_Intel — Wed, 18 Aug 2010 07:25:52 GMT

Andr,

please look at themkl_ddnscsr(,,,,,) routine which converts dense to the CSR representations when job(1) == 0.

will it appropriate for you?

--Gennady

topic Compress matrix in CSR Format after matrix multiplication in Intel® oneAPI Math Kernel Library

Compress matrix in CSR Format after matrix multiplication

Compress matrix in CSR Format after matrix multiplication