TY - GEN

T1 - Repeated-task Canadian traveler problem

AU - Bnaya, Zahy

AU - Felner, Ariel

AU - Shimony, Solomon Eyal

AU - Fried, Dror

AU - Maksin, Olga

PY - 2011/12/1

Y1 - 2011/12/1

N2 - In the Canadian Traveler Problem (CTP) a traveling agent is given a graph, where some of the edges may be blocked, with a known probability. A solution for CTP is a policy, that has the smallest expected traversal cost. CTP is intracable. Previous work has focused on the case of a single agent. We generalize CTP to a repeated task version where a number of agents need to travel to the same goal, minimizing their combined travel cost. We provide optimal algorithms for the special case of disjoint path graphs. Based on a previous UCT-based approach for the single agent case, a framework is developed for the multi-agent case and four variants are given - two of which are based on the results for disjoint-path graphs. Empirical results show the benefits of the suggested framework and the resulting heuristics. For small graphs where we could compare to optimal policies, our approach achieves near-optimal results at only a fraction of the computation cost.

AB - In the Canadian Traveler Problem (CTP) a traveling agent is given a graph, where some of the edges may be blocked, with a known probability. A solution for CTP is a policy, that has the smallest expected traversal cost. CTP is intracable. Previous work has focused on the case of a single agent. We generalize CTP to a repeated task version where a number of agents need to travel to the same goal, minimizing their combined travel cost. We provide optimal algorithms for the special case of disjoint path graphs. Based on a previous UCT-based approach for the single agent case, a framework is developed for the multi-agent case and four variants are given - two of which are based on the results for disjoint-path graphs. Empirical results show the benefits of the suggested framework and the resulting heuristics. For small graphs where we could compare to optimal policies, our approach achieves near-optimal results at only a fraction of the computation cost.

UR - http://www.scopus.com/inward/record.url?scp=84858988993&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84858988993

SN - 9781577355373

T3 - Proceedings of the 4th Annual Symposium on Combinatorial Search, SoCS 2011

SP - 24

EP - 30

BT - Proceedings of the 4th Annual Symposium on Combinatorial Search, SoCS 2011

T2 - 4th International Symposium on Combinatorial Search, SoCS 2011

Y2 - 15 July 2011 through 16 July 2011

ER -