When the user wants to design, implement, or tune ant colony optimization for combinatorial problems, including pheromone model design, visibility heuristics, and choosing among Ant System, Ant Colony System, and MAX-MIN Ant System. Also use when the user mentions "ant colony," "ACO," "pheromone," "MMAS," "ant colony system," "pheromone evaporation," "pheromone trail," "construction graph," or when solutions are built component-by-component guided by learned trail values. For tour neighborhoods and 2-opt machinery, see local-search-and-neighborhoods; for TSP formulations and benchmarks, see traveling-salesman-problem.
