Exploring deterministic constraints: from a constrained English POS tagger to an efficient ILP solution to Chinese word segmentation

  • Authors:
  • Qiuye Zhao;Mitch Marcus

  • Affiliations:
  • University of Pennsylvania;University of Pennsylvania

  • Venue:
  • ACL '12 Proceedings of the 50th Annual Meeting of the Association for Computational Linguistics: Long Papers - Volume 1
  • Year:
  • 2012

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Abstract

We show for both English POS tagging and Chinese word segmentation that with proper representation, large number of deterministic constraints can be learned from training examples, and these are useful in constraining probabilistic inference. For tagging, learned constraints are directly used to constrain Viterbi decoding. For segmentation, character-based tagging constraints can be learned with the same templates. However, they are better applied to a word-based model, thus an integer linear programming (ILP) formulation is proposed. For both problems, the corresponding constrained solutions have advantages in both efficiency and accuracy.