Genetic algorithms for feature relevance assignment in memory-based language processing

  • Authors:
  • Anne Kool;Walter Daelemans;Jakub Zavrel

  • Affiliations:
  • University of Antwerp, UIA, Antwerpen, Belgium;University of Antwerp, UIA, Antwerpen, Belgium;University of Antwerp, UIA, Antwerpen, Belgium

  • Venue:
  • ConLL '00 Proceedings of the 2nd workshop on Learning language in logic and the 4th conference on Computational natural language learning - Volume 7
  • Year:
  • 2000

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Abstract

We investigate the usefulness of evolutionary algorithms in three incarnations of the problem of feature relevance assignment in memory-based language processing (MBLP): feature weighting, feature ordering and feature selection. We use a simple genetic algorithm (GA) for this problem on two typical tasks in natural language processing: morphological synthesis and unknown word tagging. We find that GA feature selection always significantly outperforms the MBLP variant without selection and that feature ordering and weighting with GA significantly outperforms a situation where no weighting is used. However, GA selection does not significantly do better than simple iterative feature selection methods, and GA weighting and ordering reach only similar performance as current information-theoretic feature weighting methods.