extern crate disjoint_sets;
pub mod mutex;
#[cfg(test)]
mod tests {
extern crate pretty_env_logger;
use std::collections::HashMap;
use disjoint_sets::UnionFind;
use pretty_env_logger as _log;
#[test]
fn mutex_ws() {
let _ = _log::try_init();
let uf = super::mutex::compute_mutex_watershed_clustering(
3,
&vec![
(0, 1, 1.0, false),
(1, 2, 2.0, false),
(0, 2, 1.9, true),
][..]
);
assert_ne!(uf.find(0), uf.find(1));
assert_ne!(uf.find(0), uf.find(2));
assert_eq!(uf.find(1), uf.find(2));
}
const EDGES_BASE: [(u32, u32, f64, bool); 7] = [
(0, 1, 1.0, false),
(1, 2, 1.0, false),
(2, 3, 1.0, false),
(4, 5, 1.0, false),
(5, 6, 1.0, false),
(6, 7, 1.0, false),
(6, 8, 1.0, false)
];
#[test]
fn mutex_ws_variable_edge() {
let _ = _log::try_init();
mutex_ws_for_edges(
&EDGES_BASE,
&[vec![0, 1, 2, 3], vec![4, 5, 6, 7, 8]]);
let mut edges_without_mutex = EDGES_BASE.to_vec();
edges_without_mutex.push((3, 4, 1.1, false));
mutex_ws_for_edges(
&edges_without_mutex[..],
&[vec![0, 1, 2, 3, 4, 5, 6, 7, 8]]);
let mut edges_with_mutex = EDGES_BASE.to_vec();
edges_with_mutex.push((3, 4, 1.1, true));
mutex_ws_for_edges(
&edges_with_mutex[..],
&[vec![0, 1, 2, 3], vec![4, 5, 6, 7, 8]]);
let mut edges_without_mutex = EDGES_BASE.to_vec();
edges_without_mutex.push((3, 5, 0.9, false));
mutex_ws_for_edges(
&edges_without_mutex[..],
&[vec![0, 1, 2, 3, 4, 5, 6, 7, 8]]);
let mut edges_with_mutex = EDGES_BASE.to_vec();
edges_with_mutex.push((3, 4, 1.1, true));
edges_with_mutex.push((3, 5, 0.9, false));
mutex_ws_for_edges(
&edges_with_mutex[..],
&[vec![0, 1, 2, 3], vec![4, 5, 6, 7, 8]]);
}
fn mutex_ws_for_edges(
edges: &[(u32, u32, f64, bool)],
expected: &[Vec<u32>]
) {
let uf = super::mutex::compute_mutex_watershed_clustering(9, &edges);
let actual = group_by_smallest_element(&uf);
assert_eq!(actual, expected);
}
fn group_by_smallest_element(uf: &UnionFind<u32>) -> Vec<Vec<u32>> {
let mut hm: HashMap<u32, Vec<u32>> = HashMap::new();
for id in 0..uf.len() {
let id_u32 = id as u32;
let root = uf.find(id_u32);
if !hm.contains_key(&root) {
hm.insert(root, vec![id_u32]);
} else {
hm.get_mut(&root).unwrap().push(id_u32);
}
}
let mut clusters: Vec<Vec<u32>> = hm.values().cloned().collect();
for cluster in clusters.iter_mut() { cluster.sort(); }
clusters.sort_by(|c1, c2| c1[0].cmp(&c2[0]));
clusters
}
}