Left-to-right parsing and bilexical context-free grammars

  • Authors:
  • Mark-Jan Nederhof;Giorgio Satta

  • Affiliations:
  • DFKI, Saarbrücken, Germany;Università di Padova, Padova, Italy

  • Venue:
  • NAACL 2000 Proceedings of the 1st North American chapter of the Association for Computational Linguistics conference
  • Year:
  • 2000

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Abstract

We compare the asymptotic time complexity of left-to-right and bidirectional parsing techniques for bilexical context-free grammars, a grammar formalism that is an abstraction of language models used in several state-of-the-art real-world parsers. We provide evidence that left-to-right parsing cannot be realised within acceptable time-bounds if the so called correct-prefix property is to be ensured. Our evidence is based on complexity results for the representation of regular languages.