Stochastic discourse modeling in spoken dialogue systems using semantic dependency graphs

  • Authors:
  • Jui-Feng Yeh;Chung-Hsien Wu;Mao-Zhu Yang

  • Affiliations:
  • National Cheng Kung University, Tainan, Taiwan, R.O.C.;National Cheng Kung University, Tainan, Taiwan, R.O.C.;National Cheng Kung University, Tainan, Taiwan, R.O.C.

  • Venue:
  • COLING-ACL '06 Proceedings of the COLING/ACL on Main conference poster sessions
  • Year:
  • 2006

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Abstract

This investigation proposes an approach to modeling the discourse of spoken dialogue using semantic dependency graphs. By characterizing the discourse as a sequence of speech acts, discourse modeling becomes the identification of the speech act sequence. A statistical approach is adopted to model the relations between words in the user's utterance using the semantic dependency graphs. Dependency relation between the headword and other words in a sentence is detected using the semantic dependency grammar. In order to evaluate the proposed method, a dialogue system for medical service is developed. Experimental results show that the rates for speech act detection and task-completion are 95.6% and 85.24%, respectively, and the average number of turns of each dialogue is 8.3. Compared with the Bayes' classifier and the Partial-Pattern Tree based approaches, we obtain 14.9% and 12.47% improvements in accuracy for speech act identification, respectively.