pub fn build_guide_tree<T>(
    fasta_records: &FastaRecords,
    align_prob_mats_with_rna_id_pairs: &SparseProbMatsWithRnaIdPairs<T>,
    feature_scores: &FeatureCountsPosterior
) -> (ProgressiveTree, NodeIndex<DefaultIx>)where
    T: Unsigned + PrimInt + Hash + FromPrimitive + Integer + Ord + Sync + Send + Display,