tailieunhanh - Báo cáo khoa học: "A Preliminary Model of Centering in Dialog*"

The centering framework explains local coherence by relating local focus and the form of referring expressions. It has proven useful in monolog, but its utility for multiparty discourse has not been shown, and a variety of issues must be tackled to adapt the model for dialog. This paper reports our application of three naive models of centering theory for dialog. These results will be used as baselines for evaluating future models. | A Preliminary Model of Centering in Dialog D. Byron and A. Stent University of Rochester Computer Science Department Rochester NY 14627 . dbyron Abstract The centering framework explains local coherence by relating local focus and the form of referring expressions. It has proven useful in monolog but its utility for multiparty discourse has not been shown and a variety of issues must be tackled to adapt the model for dialog. This paper reports our application of three naive models of centering theory for dialog. These results will be used as baselines for evaluating future 1 Introduction The centering framework Grosz et al. 1995 is one of the most influential computational linguistics theories relating local focus to the form chosen for referring expressions. A number of studies have developed refinements and extensions of the theory eg. Brennan et al. 1987 Kameyama 1986 Strube and Hahn 1996 Walker et al. 1998 but few have attempted to extend the model to multi-party discourse cf. Brennan 1998 Walker 1998 . For dialog systems the benefits of using centering theory include improved reference resolution and generation of more coherent referring expressions. However it is not at all clear how to adapt the theory for multi-party discourse. This paper examines some of the issues involved in adapting the theory then describes the results of applying three alternative models to a corpus of 2-person dialogs. We chose very naive approximations to the original theory as a starting point. These results will be a baseline for evaluating more sophisticated models in the future. 2 The Centering model The centering framework Grosz et al. 1995 makes three main claims 1 given an utterance Un the The authors would like to thank James Allen Marilyn Walker and the anonymous reviewers for many helpful comments on a preliminary draft of the paper. This material is based on work supported by NSF grant IRI-96-23665 ONR grant N00014-95-1-1088 and .

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