Function sprs::prod::csr_mulacc_dense_colmaj

pub fn csr_mulacc_dense_colmaj<'a, N, I, Iptr>(
    lhs: CsMatViewI<'_, N, I, Iptr>, 
    rhs: ArrayView<'_, N, Ix2>, 
    out: ArrayViewMut<'a, N, Ix2>
) where
    N: 'a + MulAcc,
    I: 'a + SpIndex,
    Iptr: 'a + SpIndex, 

CSR-dense colmaj multiplication

Performs better if rhs has few columns.