Efficiently mining frequent embedded unordered trees

Mohammed J. Zaki

Research output: Contribution to journalArticle

75 Citations (Scopus)


Mining frequent trees is very useful in domains like bioinformatics, web mining, mining semi-structured data, and so on. In this paper we introduce SLEUTH, an efficient algorithm for mining frequent, unordered, embedded subtrees in a database of labeled trees. The key contributions of our work are as follows: We give the first algorithm that enumerates all embedded, unordered trees. We propose a new equivalence class extension scheme to generate all candidate trees. We extend the notion of scope-list joins to compute frequency of unordered trees. We conduct performance evaluation on several synthetic and real datasets to show that SLEUTH is an efficient algorithm, which has performance comparable to TreeMiner, that mines only ordered trees.

Original languageEnglish
Pages (from-to)33-52
Number of pages20
JournalFundamenta Informaticae
Issue number1-2
Publication statusPublished - 7 Sep 2005
Externally publishedYes



  • Embedded Trees
  • Tree Mining
  • Unordered Trees

ASJC Scopus subject areas

  • Computer Graphics and Computer-Aided Design
  • Software
  • Applied Mathematics
  • Safety, Risk, Reliability and Quality

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