pub fn factorize_supernodal_numeric_llt<I: Index, E: ComplexField>(
    L_values: GroupFor<E, &mut [E::Unit]>,
    A_lower: SparseColMatRef<'_, I, E>,
    regularization: LltRegularization<E>,
    symbolic: &SymbolicSupernodalCholesky<I>,
    parallelism: Parallelism,
    stack: PodStack<'_>
) -> Result<usize, CholeskyError>