Function pqgrams::pqgram_distance

pub fn pqgram_distance<L: 'static, T>(
    left: &Vec<PQGram<L>>, 
    right: &Vec<PQGram<L>>, 
    alt_filler_value: Option<L>
) -> f64 where
    L: ValidGramElement,
    T: LabelledTree<L>, 

Calculates PQGram distance between two profiles, using the default_gram_edit_distance function. All notes for pqgram_distance_with_fn apply here, particularly with respect to alt_filler_value!