UBC-UPC: sequential SRL using selectional preferences: an aproach with maximum entropy Markov models

  • Authors:
  • Beñat Zapirain;Eneko Agirre;Lluís Màrquez

  • Affiliations:
  • University of the Basque Country, Donostia, Basque Country;University of the Basque Country, Donostia, Basque Country;Technical University of Catalonia, Barcelona, Catalonia

  • Venue:
  • SemEval '07 Proceedings of the 4th International Workshop on Semantic Evaluations
  • Year:
  • 2007

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Abstract

We present a sequential Semantic Role Labeling system that describes the tagging problem as a Maximum Entropy Markov Model. The system uses full syntactic information to select BIO-tokens from input data, and classifies them sequentially using state-of-the-art features, with the addition of Selectional Preference features. The system presented achieves competitive performance in the CoNLL-2005 shared task dataset and it ranks first in the SRL subtask of the Semeval-2007 task 17.