Efficient, correct, unsupervised learning of context-sensitive languages

  • Authors:
  • Alexander Clark

  • Affiliations:
  • Royal Holloway, University of London

  • Venue:
  • CoNLL '10 Proceedings of the Fourteenth Conference on Computational Natural Language Learning
  • Year:
  • 2010

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Abstract

A central problem for NLP is grammar induction: the development of unsupervised learning algorithms for syntax. In this paper we present a lattice-theoretic representation for natural language syntax, called Distributional Lattice Grammars. These representations are objective or empiricist, based on a generalisation of distributional learning, and are capable of representing all regular languages, some but not all context-free languages and some non-context-free languages. We present a simple algorithm for learning these grammars together with a complete self-contained proof of the correctness and efficiency of the algorithm.