Friday, December 04, 2009

Suffix Tree Clustering

I recently stumbled upon this very interesting paper:

Web Document Clustering: A Feasibility Demonstration , by Zamir and Etzioni. PDF here

The paper presents an attractive technique for clustering documents using Suffix Trees, the merits of which can be summarized as:

  • The algorithm is incremental, meaning that documents can be added at any time and clusters can be re-evaluated accordingly
  • Does this in linear complexity O(n)
  • Deals with documents as strings, not as Bags of Words, which allows for accounting for context
  • The algorithm actually produces sequences of words that represent each cluster (with no extra cost)
  • Can produce clusters that are not mutually exclusive (fuzzy clusters)
  • and finally the authors claim it can work efficiently on search engine snippets

Suffix Trees are data structures that are very suitable for indexing text documents (for search purposes), and I think it very devious to exploit the same structure for clustering.

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