Pairwise Symmetry Reasoning for Multi-Agent Path Finding Search
Pairwise Symmetry Reasoning for Multi-Agent Path Finding Search
复制标题
多智能体路径查找搜索的成对对称推理
DOI:
10.1016/j.artint.2021.103574
复制
发表时间:
2021
影响因子:
14.4
通讯作者:
Koenig, S.
中科院分区:
文献类型:
--
作者:
Li, J.;Harabor, D.;Stuckey, P.;Ma, H.;Gange, G.;Koenig, S.
Multi-Agent Path Finding (MAPF) is a challenging combinatorial problem that asks us to plan collision-free paths for a team of cooperative agents. In this work, we show that one of the reasons why MAPF is so hard to solve is due to a phenomenon called pairwise symmetry, which occurs when two agents have many different paths to their target locations, all of which appear promising, but every combination of them results in a collision. We identify several classes of pairwise symmetries and show that each one arises commonly in practice and can produce an exponential explosion in the space of possible collision resolutions, leading to unacceptable runtimes for current state-of-the-art (bounded-sub)optimal MAPF algorithms. We propose a variety of reasoning techniques that detect the symmetries efficiently as they arise and resolve them by using specialized constraints to eliminate all permutations of pairwise colliding paths in a single branching step. We implement these ideas in the context of a leading optimal MAPF algorithm CBS and show that the addition of the symmetry reasoning techniques can have a dramatic positive effect on its performance — we report a reduction in the number of node expansions by up to four orders of magnitude and an increase in scalability by up to thirty times. These gains allow us to solve to optimality a variety of challenging MAPF instances previously considered out of reach for CBS.
登录
查看更多内容
DOI:
10.24963/ijcai.2019/179
发表时间:
2019-08
期刊:
Comput. Oper. Res.
影响因子:
--
作者:
Edward Lam;P. L. Bodic;Daniel Damir Harabor;Peter James Stuckey
通讯作者:
Edward Lam;P. L. Bodic;Daniel Damir Harabor;Peter James Stuckey
影响因子:
1.6
作者:
D. Cohen;P. Jeavons;Christopher Jefferson;K. Petrie;Barbara M. Smith
通讯作者:
Barbara M. Smith
DOI:
--
发表时间:
2018
期刊:
Symposium on Combinatorial Search
影响因子:
--
作者:
Dor Atzmon;Roni Stern;Ariel Felner;Glenn Wagner;R. Barták;Neng
通讯作者:
Neng
DOI:
--
发表时间:
2018
期刊:
International Conference on Automated Planning and Scheduling
影响因子:
--
作者:
Gabriele Röger;Silvan Sievers;Michael Katz
通讯作者:
Michael Katz
DOI:
--
发表时间:
2020
期刊:
Proceedings of the International Conference on Automated Planning and Scheduling
影响因子:
--
作者:
Zhang, H.;Li, J.;Surynek, P;Koenig, S.;Kumar, S.
通讯作者:
Kumar, S.