An improved oracle for dependency parsing with online reordering

  • Authors:
  • Joakim Nivre;Marco Kuhlmann;Johan Hall

  • Affiliations:
  • Uppsala University, Uppsala and Växjö University, Växjö;Uppsala University, Uppsala;Uppsala University, Uppsala

  • Venue:
  • IWPT '09 Proceedings of the 11th International Conference on Parsing Technologies
  • Year:
  • 2009

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Abstract

We present an improved training strategy for dependency parsers that use online reordering to handle non-projective trees. The new strategy improves both efficiency and accuracy by reducing the number of swap operations performed on non-projective trees by up to 80%. We present state-of-the-art results for five languages with the best ever reported results for Czech.