Beam-width prediction for efficient context-free parsing

  • Authors:
  • Nathan Bodenstab;Aaron Dunlop;Keith Hall;Brian Roark

  • Affiliations:
  • Oregon Health & Science University, Portland, OR;Oregon Health & Science University, Portland, OR;Google, Inc., Zurich, Switzerland;Oregon Health & Science University, Portland, OR

  • Venue:
  • HLT '11 Proceedings of the 49th Annual Meeting of the Association for Computational Linguistics: Human Language Technologies - Volume 1
  • Year:
  • 2011

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Abstract

Efficient decoding for syntactic parsing has become a necessary research area as statistical grammars grow in accuracy and size and as more NLP applications leverage syntactic analyses. We review prior methods for pruning and then present a new framework that unifies their strengths into a single approach. Using a log linear model, we learn the optimal beam-search pruning parameters for each CYK chart cell, effectively predicting the most promising areas of the model space to explore. We demonstrate that our method is faster than coarse-to-fine pruning, exemplified in both the Charniak and Berkeley parsers, by empirically comparing our parser to the Berkeley parser using the same grammar and under identical operating conditions.