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arXiv cs/0405069cs.DBcs.IR
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从辅助存储器中挖掘频繁项集

Mining Frequent Itemsets from Secondary Memory

Gösta Grahne, Jianfei Zhu

摘要:

频繁项集挖掘是关联规则挖掘的核心,目前在算法上已经得到了很好的理解。然而,大多数挖掘频繁项集的算法都假设主存储器足够大以容纳挖掘中使用的数据结构,很少有有效的算法处理数据库很大或最小支持度很低的情况。从一个非常大的数据库中挖掘频繁项集带来了新的挑战,因为商业,科学和政府中普遍记录了天文数字数量的原始数据。本文讨论了当数据结构太大而无法装入主存时,挖掘频繁项集的方法。给出了几种分而治之的磁盘挖掘算法。介绍了许多新技术。实验结果表明,该技术减少了所需的磁盘访问的数量级,并使真正可扩展的数据采掘。

英文摘要:

Mining frequent itemsets is at the core of mining association rules, and is by now quite well understood algorithmically. However, most algorithms for mining frequent itemsets assume that the main memory is large enough for the data structures used in the mining, and very few efficient algorithms deal with the case when the database is very large or the minimum support is very low. Mining frequent itemsets from a very large database poses new challenges, as astronomical amounts of raw data is ubiquitously being recorded in commerce, science and government. In this paper, we discuss approaches to mining frequent itemsets when data structures are too large to fit in main memory. Several divide-and-conquer algorithms are given for mining from disks. Many novel techniques are introduced. Experimental results show that the techniques reduce the required disk accesses by orders of magnitude, and enable truly scalable data mining.

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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