Function sprs::prod::mul_acc_mat_vec_csc

pub fn mul_acc_mat_vec_csc<N, I, Iptr, V, VRes>(
    mat: CsMatViewI<'_, N, I, Iptr>, 
    in_vec: V, 
    res_vec: VRes
) where
    N: MulAcc,
    I: SpIndex,
    Iptr: SpIndex,
    V: DenseVector<Scalar = N>,
    VRes: DenseVectorMut<Scalar = N>, 

Multiply a sparse CSC matrix with a dense vector and accumulate the result into another dense vector