Learning the information status of noun phrases in spoken dialogues

  • Authors:
  • Altaf Rahman;Vincent Ng

  • Affiliations:
  • University of Texas at Dallas, Richardson, TX;University of Texas at Dallas, Richardson, TX

  • Venue:
  • EMNLP '11 Proceedings of the Conference on Empirical Methods in Natural Language Processing
  • Year:
  • 2011

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Abstract

An entity in a dialogue may be old, new, or mediated/inferrable with respect to the hearer's beliefs. Knowing the information status of the entities participating in a dialogue can therefore facilitate its interpretation. We address the under-investigated problem of automatically determining the information status of discourse entities. Specifically, we extend Nissim's (2006) machine learning approach to information-status determination with lexical and structured features, and exploit learned knowledge of the information status of each discourse entity for coreference resolution. Experimental results on a set of Switchboard dialogues reveal that (1) incorporating our proposed features into Nissim's feature set enables our system to achieve state-of-the-art performance on information-status classification, and (2) the resulting information can be used to improve the performance of learning-based coreference resolvers.