TAILIEUCHUNG - Báo cáo khoa học: "Lexical Choice Criteria in Language Generation"

In natural language generation (NLG), a semantic representation of some k i n d - possibly enriched with pragmatic attributes - - is successively transformed into one or more linguistic utterances. No matter what particular architecture is chosen to organize this process, one of the crucial decisions to be made is lexicalization: selecting words that adequately express the content that is to be communicated and, if represented, the intentions and attitudes of the speaker. | Lexical Choice Criteria in Language Generation Manfred stede Department of Computer Science University of Toronto Toronto M5S 1A4 Canada mstede@ 1 Introduction In natural language generation NLG a semantic representation of some kind possibly enriched with pragmatic attributes is successively transformed into one or more linguistic utterances. No matter what particular architecture is chosen to organize this process one of the crucial decisions to be made is lexicalization selecting words that adequately express the content that is to be communicated and if represented the intentions and attitudes of the speaker. Nirenburg and Nirenburg 1988 give this example to illustrate the lexical choice problem If we want to express the meaning a person whose sex is male and whose age is between 13 and 15 years then candidate realizations include boy kid teenager youth child young man schoolboy adolescent man. The criteria influencing such choices remain largely in the dark however. As it happens the problem of lexical choice has not been a particularly popular one in NLG. For instance Marcus 1987 complained that most generators don t really choose words at all McDonald 1991 amongst others lamented that lexical choice has attracted only very little attention in the research community. Implemented generators tend to provide a one-to-one mapping from semantic units to lexical items and their producers occasionally acknowledge this as a shortcoming . Novak 1991 p. 666J thereby the task of lexical choice becomes a nonissue. For many applications this is indeed a feasible scheme because the sub-language under consideration can be sufficiently restricted such that a direct mapping from content to words does not present a drawback the generator is implicitly tailored towards the type of situation or register in which it operates. But in general with an eye on more expressive and versatile generators this state of affairs calls for improvement. Why is lexical choice .

• Báo cáo khoa học
• Lexical Choice Criteria
• Language Generation
• Manfred Stede
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