Function conshomfold::pct_of_prob_mats

pub fn pct_of_prob_mats(
    prob_mats_with_rna_id_pairs: &HashMap<(usize, usize), StaProbMats, BuildHasherDefault<FxHasher>>, 
    rna_id: usize, 
    num_of_rnas: usize, 
    bpp_mats: &SsProbMats, 
    upp_mat_len: usize, 
    produces_access_probs: bool
) -> PctStaProbMats