Multi-view discriminative sequential learning

  • Authors:
  • Ulf Brefeld;Christoph Büscher;Tobias Scheffer

  • Affiliations:
  • Department of Computer Science, Humboldt-Universität zu Berlin, Berlin, Germany;Department of Computer Science, Humboldt-Universität zu Berlin, Berlin, Germany;Department of Computer Science, Humboldt-Universität zu Berlin, Berlin, Germany

  • Venue:
  • ECML'05 Proceedings of the 16th European conference on Machine Learning
  • Year:
  • 2005

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Abstract

Discriminative learning techniques for sequential data have proven to be more effective than generative models for named entity recognition, information extraction, and other tasks of discrimination. However, semi-supervised learning mechanisms that utilize inexpensive unlabeled sequences in addition to few labeled sequences – such as the Baum-Welch algorithm – are available only for generative models. The multi-view approach is based on the principle of maximizing the consensus among multiple independent hypotheses; we develop this principle into a semi-supervised hidden Markov perceptron, and a semi-supervised hidden Markov support vector learning algorithm. Experiments reveal that the resulting procedures utilize unlabeled data effectively and discriminate more accurately than their purely supervised counterparts.