Function quantiles::misra_gries::misra_gries

pub fn misra_gries<I, V>(stream: I, k: usize) -> BTreeMap<V, usize> where
    I: IntoIterator<Item = V>,
    V: Ord + Clone, 

Calculates the k most frequent elements in the iterable stream of elements stream using an ε-approximate frequency count where ε = 1/(k+1)