Don't be afraid of simpler patterns

  • Authors:
  • Björn Bringmann;Albrecht Zimmermann;Luc De Raedt;Siegfried Nijssen

  • Affiliations:
  • Institute of Computer Science, Machine Learning Lab, Albert-Ludwigs-University Freiburg, Freiburg, Germany;Institute of Computer Science, Machine Learning Lab, Albert-Ludwigs-University Freiburg, Freiburg, Germany;Institute of Computer Science, Machine Learning Lab, Albert-Ludwigs-University Freiburg, Freiburg, Germany;Institute of Computer Science, Machine Learning Lab, Albert-Ludwigs-University Freiburg, Freiburg, Germany

  • Venue:
  • PKDD'06 Proceedings of the 10th European conference on Principle and Practice of Knowledge Discovery in Databases
  • Year:
  • 2006

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Abstract

This paper investigates the trade-off between the expressiveness of the pattern language and the performance of the pattern miner in structured data mining. This trade-off is investigated in the context of correlated pattern mining, which is concerned with finding the k-best patterns according to a convex criterion, for the pattern languages of itemsets, multi-itemsets, sequences, trees and graphs. The criteria used in our investigation are the typical ones in data mining: computational cost and predictive accuracy and the domain is that of mining molecular graph databases. More specifically, we provide empirical answers to the following questions: how does the expressive power of the language affect the computational cost? and what is the trade-off between expressiveness of the pattern language and the predictive accuracy of the learned model? While answering the first question, we also introduce a novel stepwise approach to correlated pattern mining in which the results of mining a simpler pattern language are employed as a starting point for mining in a more complex one. This stepwise approach typically leads to significant speed-ups (up to a factor 1000) for mining graphs.