Probabilistic Robust Multi-Agent Path Finding

  • Dor Atzmon Ben-Gurion University of the Negev
  • Roni Stern Ben-Gurion University of the Negev
  • Ariel Felner Ben-Gurion University of the Negev
  • Nathan R. Sturtevant University of Alberta
  • Sven Koenig University of Southern California

Abstract

In a multi-agent path finding (MAPF) problem, the task is to move a set of agents to their goal locations without conflicts. In the real world, unexpected events may delay some of the agents. In this paper, we therefore study the problem of finding a p-robust solution to a given MAPF problem, which is a solution that succeeds with probability at least p, even though unexpected delays may occur. We propose two methods for verifying that given solutions are p-robust. We also introduce an optimal CBS-based algorithm, called pR-CBS, and a fast suboptimal algorithm, called pR-GCBS, for finding such solutions. Our experiments show that a p-robust solution reduces the number of conflicts compared to optimal, non-robust solutions.

Published
2020-06-01