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arXiv 2103.12701cs.AI
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A*+ BFHS:一种混合启发式搜索算法

A*+BFHS: A Hybrid Heuristic Search Algorithm

University of California, Los Angeles(加州大学洛杉矶分校)

Zhaoxing Bu, Richard E. Korf

摘要:

我们提出了一个新的算法A*+BFHS解决问题的单位成本运营商A* 和IDA* 失败,由于内存限制和/或存在许多不同的路径之间的同一对节点。A*+BFHS是基于A* 和广度优先启发式搜索(BFHS)的。A*+BFHS结合了两种算法的优点,即A* 的节点排序,BFHS的内存节省,以及两种算法的重复检测。在简单的问题上,A*+BFHS的行为与A* 相同。在困难的问题上,它比A* 慢,但节省了大量的内存。与BFIDA* 相比,A*+BFHS在各种规划领域将搜索时间和/或内存需求降低了数倍。

英文摘要:

We present a new algorithm A*+BFHS for solving problems with unit-cost operators where A* and IDA* fail due to memory limitations and/or the existence of many distinct paths between the same pair of nodes. A*+BFHS is based on A* and breadth-first heuristic search (BFHS). A*+BFHS combines advantages from both algorithms, namely A*'s node ordering, BFHS's memory savings, and both algorithms' duplicate detection. On easy problems, A*+BFHS behaves the same as A*. On hard problems, it is slower than A* but saves a large amount of memory. Compared to BFIDA*, A*+BFHS reduces the search time and/or memory requirement by several times on a variety of planning domains.

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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