arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1107.0052cs.AI
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规划中的有序地标

Ordered Landmarks in Planning

J. Hoffmann, J. Porteous, L. Sebastia

摘要:

许多已知的规划任务具有关于实现目标的最佳顺序的固有约束。已经进行了一些研究工作,以发现这种限制,并利用它们来指导搜索,希望加快规划过程。我们超越了以前的方法,考虑排序约束不仅在(顶层)的目标,而且在子目标,将必然出现在规划。地标是在每个有效的解决方案计划中的某个点上必须为真的事实。我们扩展克勒和霍夫曼的定义之间的合理订单的最高级别的目标,更一般的情况下,地标。我们将展示如何发现地标,如何近似其合理的顺序,以及如何使用这些信息将给定的规划任务分解为几个较小的子任务。我们的方法完全独立于领域和规划者。实施表明,该方法可以产生显着的运行时性能改善时,作为一个控制回路周围的国家的最先进的次优规划系统,例如FF和LPG。

英文摘要:

Many known planning tasks have inherent constraints concerning the best order in which to achieve the goals. A number of research efforts have been made to detect such constraints and to use them for guiding search, in the hope of speeding up the planning process. We go beyond the previous approaches by considering ordering constraints not only over the (top-level) goals, but also over the sub-goals that will necessarily arise during planning. Landmarks are facts that must be true at some point in every valid solution plan. We extend Koehler and Hoffmann's definition of reasonable orders between top level goals to the more general case of landmarks. We show how landmarks can be found, how their reasonable orders can be approximated, and how this information can be used to decompose a given planning task into several smaller sub-tasks. Our methodology is completely domain- and planner-independent. The implementation demonstrates that the approach can yield significant runtime performance improvements when used as a control loop around state-of-the-art sub-optimal planning systems, as exemplified by FF and LPG.

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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