arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2011.13454cs.DB
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TKUS:挖掘Top-K高效用序列模式

TKUS: Mining Top-K High-Utility Sequential Patterns

Chunkai Zhang, Zilin Du, Wensheng Gan, Philip S. Yu

摘要:

高效用序列模式挖掘(HUSPM)是近年来的一个研究热点。HUSPM的主要任务是在一个定量的序列数据库中找到所有具有高效用的连续性,这些连续性相对于用户定义的最小效用阈值具有高效用。然而,很难指定最低效用阈值,特别是当数据库功能(在大多数情况下是不可见的)不被理解时。为了解决这个问题,top-k HUSPM被提出。到目前为止,只进行了非常初步的工作,以捕捉前k HUSP,现有的策略需要改进的运行时间,内存消耗,没有前途的候选人过滤,和可扩展性。此外,没有系统的问题说明。在本文中,我们制定的top-k HUSPM的问题,并提出了一种新的算法称为TKUS。为了提高效率,TKUS采用了投影和局部搜索机制,并采用了几种方案,包括序列效用提升,提前终止后代和消除不希望的项目策略,这使得它能够大大减少搜索空间。实验结果表明,TKUS算法与现有的TKHUS-Span算法相比,具有足够好的top-k HUSPM性能.

英文摘要:

High-utility sequential pattern mining (HUSPM) has recently emerged as a focus of intense research interest. The main task of HUSPM is to find all subsequences, within a quantitative sequential database, that have high utility with respect to a user-defined minimum utility threshold. However, it is difficult to specify the minimum utility threshold, especially when database features, which are invisible in most cases, are not understood. To handle this problem, top-k HUSPM was proposed. Up to now, only very preliminary work has been conducted to capture top-k HUSPs, and existing strategies require improvement in terms of running time, memory consumption, unpromising candidate filtering, and scalability. Moreover, no systematic problem statement has been defined. In this paper, we formulate the problem of top-k HUSPM and propose a novel algorithm called TKUS. To improve efficiency, TKUS adopts a projection and local search mechanism and employs several schemes, including the Sequence Utility Raising, Terminate Descendants Early, and Eliminate Unpromising Items strategies, which allow it to greatly reduce the search space. Finally, experimental results demonstrate that TKUS can achieve sufficiently good top-k HUSPM performance compared to state-of-the-art algorithm TKHUS-Span.

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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