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#[cfg(test)]
#[path = "../../../../tests/unit/solver/mutation/ruin/route_removal_test.rs"]
mod route_removal_test;
use super::*;
use crate::construction::heuristics::{group_routes_by_proximity, InsertionContext, RouteContext, SolutionContext};
use crate::models::problem::Job;
use crate::solver::RefinementContext;
pub struct RandomRouteRemoval {
min: f64,
max: f64,
threshold: f64,
}
impl RandomRouteRemoval {
pub fn new(rmin: usize, rmax: usize, threshold: f64) -> Self {
Self { min: rmin as f64, max: rmax as f64, threshold }
}
}
impl Default for RandomRouteRemoval {
fn default() -> Self {
Self::new(1, 4, 0.1)
}
}
impl Ruin for RandomRouteRemoval {
fn run(&self, _refinement_ctx: &RefinementContext, mut insertion_ctx: InsertionContext) -> InsertionContext {
let random = insertion_ctx.environment.random.clone();
let max = (insertion_ctx.solution.routes.len() as f64 * self.threshold).max(self.min).round() as usize;
let affected = random
.uniform_int(self.min as i32, self.max as i32)
.min(insertion_ctx.solution.routes.len().min(max) as i32) as usize;
(0..affected).for_each(|_| {
let route_index = random.uniform_int(0, (insertion_ctx.solution.routes.len() - 1) as i32) as usize;
let solution = &mut insertion_ctx.solution;
let route_ctx = &mut solution.routes.get(route_index).unwrap().clone();
remove_route(solution, route_ctx)
});
insertion_ctx
}
}
pub struct CloseRouteRemoval {}
impl Default for CloseRouteRemoval {
fn default() -> Self {
Self {}
}
}
impl Ruin for CloseRouteRemoval {
#[allow(clippy::needless_collect)]
fn run(&self, _refinement_ctx: &RefinementContext, mut insertion_ctx: InsertionContext) -> InsertionContext {
if let Some(route_groups_distances) = group_routes_by_proximity(&insertion_ctx) {
let random = &insertion_ctx.environment.random;
let stale_routes = insertion_ctx
.solution
.routes
.iter()
.enumerate()
.filter_map(|(idx, route)| if route.is_stale() { Some(idx) } else { None })
.collect::<Vec<_>>();
let route_index = if !stale_routes.is_empty() && random.is_head_not_tails() {
stale_routes[random.uniform_int(0, (stale_routes.len() - 1) as i32) as usize]
} else {
random.uniform_int(0, (route_groups_distances.len() - 1) as i32) as usize
};
let routes = route_groups_distances[route_index]
.iter()
.take(2)
.filter_map(|(idx, _)| insertion_ctx.solution.routes.get(*idx).cloned())
.collect::<Vec<_>>();
routes.into_iter().for_each(|mut route_ctx| {
remove_route(&mut insertion_ctx.solution, &mut route_ctx);
});
}
insertion_ctx
}
}
fn remove_route(solution: &mut SolutionContext, route_ctx: &mut RouteContext) {
if solution.locked.is_empty() {
remove_whole_route(solution, route_ctx);
} else {
remove_part_route(solution, route_ctx);
}
}
fn remove_whole_route(solution: &mut SolutionContext, route_ctx: &RouteContext) {
solution.routes.retain(|rc| rc != route_ctx);
solution.registry.free_route(&route_ctx);
solution.required.extend(route_ctx.route.tour.jobs());
}
fn remove_part_route(solution: &mut SolutionContext, route_ctx: &mut RouteContext) {
let locked = solution.locked.clone();
let can_remove_full_route = route_ctx.route.tour.jobs().all(|job| !locked.contains(&job));
if can_remove_full_route {
remove_whole_route(solution, route_ctx);
} else {
{
let jobs: Vec<Job> = route_ctx.route.tour.jobs().filter(|job| !locked.contains(job)).collect();
jobs.iter().for_each(|job| {
route_ctx.route_mut().tour.remove(job);
});
solution.required.extend(jobs);
}
}
}