arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0912.3228cs.AI
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实时的启发式搜索中的回溯问题

On Backtracking in Real-time Heuristic Search

Athabasca University(阿萨巴斯卡大学);University of Alberta(阿尔伯塔大学)

Valeriy K. Bulitko, Vadim Bulitko

摘要:

实时的【形】启发式搜索算法适用于需要在恒定时间内做出决策的位置代理。自从近二十年前Korf的原始工作以来,已经提出了许多扩展。最有趣的扩展之一是回溯的想法,其中代理决定返回到以前访问过的状态,而不是向前移动。经验表明,这一想法对各种绩效指标产生了重大影响。这些研究是在具有使用回溯的特定实时的【形】搜索算法的特定经验测试平台上进行的。因此,所观察到的趋势在多大程度上具有一般回溯的特征尚不清楚。本文首次对实时的【形】启发式搜索中的回溯问题进行了完整的理论研究。特别是,我们提出的解决方案的成本指数和线性的参数调节回溯量的上界。这些结果适用于广泛的一类实时的【形】启发式搜索算法,其中包括许多现有的算法作为一个小的子类。

英文摘要:

Real-time heuristic search algorithms are suitable for situated agents that need to make their decisions in constant time. Since the original work by Korf nearly two decades ago, numerous extensions have been suggested. One of the most intriguing extensions is the idea of backtracking wherein the agent decides to return to a previously visited state as opposed to moving forward greedily. This idea has been empirically shown to have a significant impact on various performance measures. The studies have been carried out in particular empirical testbeds with specific real-time search algorithms that use backtracking. Consequently, the extent to which the trends observed are characteristic of backtracking in general is unclear. In this paper, we present the first entirely theoretical study of backtracking in real-time heuristic search. In particular, we present upper bounds on the solution cost exponential and linear in a parameter regulating the amount of backtracking. The results hold for a wide class of real-time heuristic search algorithms that includes many existing algorithms as a small subclass.

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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