Ant Colony Optimization. Camazine et al. 2003. Dorigo et al. 1996. Dorigo and Gambardella 1997. Ned Dochtermann. February 15, 2006. CS 790R, University ...
Ant Colony Optimization Camazine et al. 2003 Dorigo et al. 1996 Dorigo and Gambardella 1997
Ned Dochtermann February 15, 2006 CS 790R, University of Nevada, Reno
Ant Colony Optimization (ACO) • Ant foraging behavior • Ant foraging behavior as an optimization method – Traveling salesman problems – How efficient and effective versus other methods
Ant foraging behavior
Ant foraging behavior • Ant foraging – How food is found – How information is passed between individuals – Route formation/Trail-following
Ant foraging behavior • How do ants find food? – Random walks
• How is information passed between foragers? – Odor trails (Wilson 1962)
Odor trails
Odor trails • After finding a food source individual ants lay down chemicals – Only lay down pheromones when they have food – Modulate intensity of signal based on the number of visits to and quality of a source
Route formation / Trail formation • Individuals follow an odor trail based on the concentration of the trail which changes according to: dCi/dt = qiΦPi – fCi where individual choice is according to: Pi = [(k + Ci)n]/[∑(k + Cset)n]
Route formation / Trail formation • One of the key parameters in the preceding equations is ‘q’ – Relative values between trails Æ value of food source
Route formation / Trail formation • Different value food sources – “better” source selected if introduced simultaneously introduced (dependent on q1/q2 ratio) – first source selected if introduced asynchronously • Dependent on q1/q2 ratio and R
Route formation / Trail formation • The basic set of two equations can be modified and added to allow for u-turns • These equations lead to the ability of ant foragers to find the shortest path, and the highest value source, even in the presence of obstacles
Trails and obstacles
Dorigo and Gambardella 1997
Ant Colony Optimization: The traveling salesman problem (TSP) • Given n cities how do you find the optimal path between them? – Genetic algorithms – Maximum likelihood – Annealing (?)
• Why not ants?
ACO: TSP • M. Dorigo first proposed this in his 1992 Phd dissertation • Apply modified ant foraging rules to TSP problems (extendable to similar optimization questions)
ACO: TSP • Maintain: – Trails with high pheromone levels are preferred – Pheromone concentration grows more quickly on short paths – Communication between ants via trail characteristics
Dorigo and Gambardella 1997
ACO: TSP • Modifications: – Knowledge of distance between cities – Working memory – Iterative resetting of trails based on shortest route (e.g. reinforcement learning)
Dorigo and Gambardella 1997
ACO: TSP • Main feature: – ants visit towns probabilistically according to a function of distance and trail/pheromone
Dorigo et al. 1996
ACO: TSP • Updating between tours
Dorigo et al. 1996
ACO: TSP
ACO: TSP • Comparison to other methods
Dorigo and Gambardella 1997
ACO: TSP • Comparison to other methods
Dorigo and Gambardella 1997
Dorigo et al. 1996
ACO: TSP • Is competitive or better than other methods in finding the optimal solution – faster – more flexible
Ant colony optimization • Other extensions: – Scheduling – Multi-dimensional space
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