tailieunhanh - Báo cáo khoa học: "UNDERSTANDING PRAGMATICALLY ILL-FORMED INPUT"

An utterance may be syntactically and semantIcally well-formed yet violate the pragmatic rules of the world model. This paper presents a context-based strateEy for constructing a cooperative but limited response to pragmatlcally illformed queries. Sug~estlon heuristics use a context model of the speaker's task inferred from the preceding dialogue to propose revisions to the speaker's ill-formed query. Selection heuristics then evaluate these suggestions based upon semantic and relevance criteria. . | UNDERSTANDING PRAGMATICALLY ILL-FORMED INPUT M. Sandra Carberry Department of Computer Science University of Delaware Newark Delaware 19711 USA ABSTRACT An utterance may be syntactically and semantically well-formed yet violate the pragnatic rules of the world model. This paper presents a context-based strategy for constructing a cooperative but limited response to pragmatically ill-formed queries. Suggestion heuristics use a context model of the speaker s task inferred from the preceding dialogue to propose revisions to the speaker s ill-formed query. Selection heuristics then evaluate these suggestions based upon semantic and relevance criteria. I INTRODUCTION An utterance may be syntactically and semantically well-formed yet violate the pragmatic rules of the world model. The system will therefore view it as ill-formed even if a native speaker finds it perfectly normal. Ulis phenomenon has been termed pragmatic overshoot Sondheimer and Weischedel 1 980 and may be divided Into three classes 1 User-specified relationships that do not exist In the world model. EXAMPLE Which apartments are for sale In a real estate model single apartments are rented not sold. However apartment buildings condominiums townhouses and houses are for sale. 2 User-specified restrictions on the relationships which can never be satisfied even with new entries. EXAMPLE Which lower-level English courses have a maximum enrollment of at most 25 students In a University world model it may be tbe case that the maximum enrollments of This material is based upon work supported by the National Science Foundation under grants IST-8009673 and IST-8311400 lower-level English courses are constrained to have values larger than 25 but that such constraints do not apply to the current enrollments of courses the maximum enrollments of upper-level English courses and the maximum enrollments of Icwer-level courses In other departments. The sample utterance Is pragmatically ill-formed since world model .

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