tailieunhanh - Báo cáo khoa học: "Specifying the Parameters of Centering Theory: a Corpus-Based Evaluation using Text from Application-Oriented Domains"

The definitions of the basic concepts, rules, and constraints of centering theory involve underspecified notions such as ‘previous utterance’, ‘realization’, and ‘ranking’. We attempted to find the best way of defining each such notion among those that can be annotated reliably, and using a corpus of texts in two domains of practical interest. Our main result is that trying to reduce the number of utterances without a backwardlooking center (CB) results in an increased number of cases in which some discourse entity, but not the CB, gets pronominalized, and viceversa. the claim that if any discourse entity is pronominalized,. | Specifying the Parameters of Centering Theory a Corpus-Based Evaluation using Text from Application-Oriented Domains M. Poesio H. Cheng R. Henschel J. Hitzeman R. Kibbled and R. Stevenson University of Edinburgh ICCS and HCRC poesio huac henschel @ t The MITRE Corporation hitz@ University of Brighton ITRI University of Durham Psychology and HCRC Abstract The definitions of the basic concepts rules and constraints of centering theory involve underspecified notions such as previous utterance r aliy atic n . and ranking . We attempted to find the best way of defining each such notion among those that can be annotated reliably and using a corpus of texts in two domains of practical interest. Our main result is that trying to reduce the number of utterances without a backwardlooking center cb results in an increased number of cases in which some discourse entity but not the CB gets pronominalized and viceversa. 1 MOTIVATION Centering Theory Grosz et al. 1995 Walker et al. 1998b is best characterized as a parametric theory its key definitions and claims involve notions such as utterance realization . and raik -ing which are not completely specified their precise definition is left as a matter for empirical research and may vary from language to language. A first goal of the work presented in this paper was to find which way of specifying these parameters among the many proposed in the literature would make the claims of centering theory most accurate as predictors of coherence and pronomi-nalization for English. We did this by annotating a corpus of English texts with the sort of information required to implement some of the most popular variants of centering theory and using this corpus to automatically check two central claims of the theory the claim that all utterances have a backward looking center cb Constraint 1 and the claim that if any discourse entity is pronomi-nalized .

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