arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1502.02642cs.DBcs.CCcs.FL
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频繁项集挖掘的形式统一

Mining Frequent Itemsets: a Formal Unification

Slimane Oulad-Naoui, Hadda Cherroun, Djelloul Ziadi

摘要:

在数据采掘研究中,建立统一的理论是一个重要的问题。在过去的二十年里,大量的工作一直致力于频繁项集(FI)挖掘问题的算法方面。我们的动机是需要在该领域的正式建模。因此,我们介绍和分析,在这个理论研究中,一个新的模型FI挖掘任务。事实上,我们编码的项目集作为一个有序的字母表的话,并说明这个问题的计数半环$(\mathbb{N},+,\times,0,1)$,其范围构成的项目集和系数是他们的支持的正式系列。这种形式主义在基本和实践方面都提供了许多优点:引入了一个清晰统一的理论框架,通过它我们可以表达主要的FI方法,它们可以推广到挖掘其他更复杂的对象,以及它们的增量或并行化;在实践中,我们解释了这个问题如何可以被看作是自动机单词识别的问题,允许在$O(|Q|)$空间和$O(|\mathcal{F}_L||Q|])$时间中的有效实现,其中,$Q$是用于表示数据的自动机的状态集合,而$\mathcal{F}_L$是首选最长FI的集合。

英文摘要:

It is generally well agreed that developing a unifying theory is one of the most important issues in Data Mining research. In the last two decades, a great deal of work has been devoted to the algorithmic aspects of the Frequent Itemset (FI) Mining problem. We are motivated by the need for formal modeling in the field. Thus, we introduce and analyze, in this theoretical study, a new model for the FI mining task. Indeed, we encode the itemsets as words over an ordered alphabet, and state this problem by a formal series over the counting semiring $(\mathbb{N},+,\times,0,1)$, whose range constitutes the itemsets and the coefficients are their supports. This formalism offers many advantages in both fundamental and practical aspects: the introduction of a clear and unified theoretical framework through which we can express the main FI-approaches, the possibility of their generalization to mine other more complex objects, and their incrementalisation or parallelisation; in practice, we explain how this problem can be seen as that of word recognition by an automaton, allowing an efficient implementation in $O(|Q|)$ space and $O(|\mathcal{F}_L||Q|])$ time, where $Q$ is the set of states of the automaton used for representing the data, and $\mathcal{F}_L$ the set of prefixial longest FI.

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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