arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2011.13455cs.DB
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序列数据的上架效用挖掘

On-shelf Utility Mining of Sequence Data

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

摘要:

效用采矿由于其广泛的应用和相当的普及而成为一个重要和有趣的话题。然而,传统的效用挖掘方法偏向于具有较长上架时间的物品,因为它们有更大的机会产生高效用。为了消除这种偏差,引入了现成效用挖掘(OSUM)问题。在本文中,我们专注于任务的OSUM的顺序数据,其中顺序数据库被划分为几个分区,根据时间段和项目相关联的公用事业和几个上架时间段。为了解决这个问题,我们提出了两种方法,OSUM序列数据(OSUMS)和OSUMS+,提取货架上的高效用序列模式。为了进一步提高算法的效率,我们还设计了几种策略来减少搜索空间和避免冗余计算,使用两个上界时间前缀扩展效用(TPEU)和时间缩减序列效用(TRSU)。此外,两个新的数据结构的开发,以方便计算的上限和效用。在真实数据集和人工数据集上的大量实验结果表明,这两种方法的性能优于现有算法。综上所述,OSUMS可能会消耗大量的内存,不适合内存有限的情况下,而OSUMS+由于其高效率,具有更广泛的实际应用。

英文摘要:

Utility mining has emerged as an important and interesting topic owing to its wide application and considerable popularity. However, conventional utility mining methods have a bias toward items that have longer on-shelf time as they have a greater chance to generate a high utility. To eliminate the bias, the problem of on-shelf utility mining (OSUM) is introduced. In this paper, we focus on the task of OSUM of sequence data, where the sequential database is divided into several partitions according to time periods and items are associated with utilities and several on-shelf time periods. To address the problem, we propose two methods, OSUM of sequence data (OSUMS) and OSUMS+, to extract on-shelf high-utility sequential patterns. For further efficiency, we also designed several strategies to reduce the search space and avoid redundant calculation with two upper bounds time prefix extension utility (TPEU) and time reduced sequence utility (TRSU). In addition, two novel data structures were developed for facilitating the calculation of upper bounds and utilities. Substantial experimental results on certain real and synthetic datasets show that the two methods outperform the state-of-the-art algorithm. In conclusion, OSUMS may consume a large amount of memory and is unsuitable for cases with limited memory, while OSUMS+ has wider real-life applications owing to its high efficiency.

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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