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arXiv 2207.14744cs.AIcs.DS
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权重约束最短路径问题的增强方法

Enhanced Methods for the Weight Constrained Shortest Path Problem

RMIT University(皇家墨尔本理工大学);Monash University(莫纳什大学);CSIRO Data61(澳大利亚联邦科学与工业研究组织 Data61)

Saman Ahmadi, Guido Tack, Daniel Harabor, Philip Kilby, Mahdi Jalili

AI总结:

针对权重约束最短路径问题,本文结合约束路径规划与双目标搜索前沿技术,提出两种基于A*搜索的新方法,可求解大规模图难题,在时空指标上优于现有最优算法,同时验证了无平局打破的桶式队列对穷举式A*双准则搜索的性能提升作用。

摘要:

经典约束路径规划是人工智能领域中研究充分但仍具挑战性的课题,在通信、交通等诸多领域有着广泛应用。权重约束最短路径问题(Weight Constrained Shortest Path Problem,WCSPP)作为仅含一个侧边约束的约束路径规划基础形式,目标是规划出重量/资源使用受限的成本最优路径。由于该问题具有双准则特性(即需要处理路径的成本和重量两个维度),求解WCSPP的方法与双目标搜索存在诸多共性。本文结合约束路径规划与双目标搜索领域的最新前沿技术,提出了两种基于A*搜索的WCSPP全新求解方法,二者均能求解超大规模图上的高难度WCSPP算例。我们在一组大规模真实问题算例上对算法性能进行了实证评估,结果表明其在时间和空间指标上均优于现有最优算法。本文还探究了优先级队列在带约束的A*搜索中的重要性,通过在真实图和随机图上开展的大量实验,证明了不带平局打破机制的基于桶的队列能够有效提升穷举式基于A*的双准则搜索的算法性能。

英文摘要:

The classic problem of constrained pathfinding is a well-studied, yet challenging, topic in AI with a broad range of applications in various areas such as communication and transportation. The Weight Constrained Shortest Path Problem (WCSPP), the base form of constrained pathfinding with only one side constraint, aims to plan a cost-optimum path with limited weight/resource usage. Given the bi-criteria nature of the problem (i.e., dealing with the cost and weight of paths), methods addressing the WCSPP have some common properties with bi-objective search. This paper leverages the recent state-of-the-art techniques in both constrained pathfinding and bi-objective search and presents two new solution approaches to the WCSPP on the basis of A* search, both capable of solving hard WCSPP instances on very large graphs. We empirically evaluate the performance of our algorithms on a set of large and realistic problem instances and show their advantages over the state-of-the-art algorithms in both time and space metrics. This paper also investigates the importance of priority queues in constrained search with A*. We show with extensive experiments on both realistic and randomised graphs how bucket-based queues without tie-breaking can effectively improve the algorithmic performance of exhaustive A*-based bi-criteria searches.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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