Function sprs::prod::csc_mulacc_dense_rowmaj

pub fn csc_mulacc_dense_rowmaj<'a, N, I>(
    lhs: CsMatViewI<N, I>, 
    rhs: ArrayView<N, Ix2>, 
    out: ArrayViewMut<'a, N, Ix2>
) where
    N: 'a + Num + Copy,
    I: 'a + SpIndex, 

CSC-dense rowmaj multiplication

Performs better if rhs has a decent number of colums.