Parsing mildly non-projective dependency structures

  • Authors:
  • Carlos Gómez-Rodríguez;David Weir;John Carroll

  • Affiliations:
  • Universidade da Coruña, Spain;University of Sussex, United Kingdom;University of Sussex, United Kingdom

  • Venue:
  • EACL '09 Proceedings of the 12th Conference of the European Chapter of the Association for Computational Linguistics
  • Year:
  • 2009

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Abstract

We present parsing algorithms for various mildly non-projective dependency formalisms. In particular, algorithms are presented for: all well-nested structures of gap degree at most 1, with the same complexity as the best existing parsers for constituency formalisms of equivalent generative power; all well-nested structures with gap degree bounded by any constant k; and a new class of structures with gap degree up to k that includes some ill-nested structures. The third case includes all the gap degree k structures in a number of dependency treebanks.