Class Cluster

crates/openquant/src/hrp.rs:238–241

fn single_linkage_children(distance: &DMatrix<f64>) -> Vec<[usize; 2]> {
    #[derive(Clone)]
    struct Cluster {
        id: usize,
        members: Vec<usize>,
    }

    let n = distance.nrows();
    let mut clusters: Vec<Cluster> = (0..n).map(|i| Cluster { id: i, members: vec![i] }).collect();