AED: An Anytime Evolutionary DCOP Algorithm
This addresses a gap in Multi-Agent Systems by applying evolutionary optimization to DCOPs, offering an incremental improvement for this domain-specific problem.
The paper tackles the problem of solving Distributed Constraint Optimization Problems (DCOPs) by introducing AED, a novel population-based algorithm using evolutionary optimization, and shows it outperforms state-of-the-art DCOP algorithms in solution quality.
Evolutionary optimization is a generic population-based metaheuristic that can be adapted to solve a wide variety of optimization problems and has proven very effective for combinatorial optimization problems. However, the potential of this metaheuristic has not been utilized in Distributed Constraint Optimization Problems (DCOPs), a well-known class of combinatorial optimization problems prevalent in Multi-Agent Systems. In this paper, we present a novel population-based algorithm, Anytime Evolutionary DCOP (AED), that uses evolutionary optimization to solve DCOPs. In AED, the agents cooperatively construct an initial set of random solutions and gradually improve them through a new mechanism that considers an optimistic approximation of local benefits. Moreover, we present a new anytime update mechanism for AED that identifies the best among a distributed set of candidate solutions and notifies all the agents when a new best is found. In our theoretical analysis, we prove that AED is anytime. Finally, we present empirical results indicating AED outperforms the state-of-the-art DCOP algorithms in terms of solution quality.