TAILIEUCHUNG - Báo cáo khoa học: "Ordering Among Premodifiers"

They are informed and motivated by our practical need for ordering multiple premodifiers in the MAGIC system [Dalal et al. 1996]. MAGIC utilizes co-ordinated text, speech, and graphics to convey information about a patient's status after coronary bypass surgery; it generates concise but complex descriptions that frequently involve four or more premodifiers in the same noun phrase. | Ordering Among Premodifiers James Shaw and Vasileios Hatzivassiloglou Department of Computer Science Columbia University New York . 10027 USA shaw vh @ Abstract We present a corpus-based study of the sequential ordering among premodifiers in noun phrases. This information is important for the fluency of generated text in practical applications. We propose and evaluate three approaches to identify sequential order among premodifiers direct evidence transitive closure and clustering. Our implemented system can make over 94 of such ordering decisions correctly as evaluated on a large previously unseen test corpus. 1 Introduction Sequential ordering among premodifiers affects the fluency of text . large foreign financial firms or zero-coupon global bonds are desirable while foreign large financial firms or global zero-coupon bonds sound odd. The difficulties in specifying a consistent ordering of adjectives have already been noted by linguists Whorf 1956 Vendler 1968 . During the process of generating complex sentences by combining multiple clauses there are situations where multiple adjectives or nouns modify the same head noun. The text generation system must order these modifiers in a similar way as domain experts use them to ensure fluency of the text. For example the description of the age of a patient precedes his ethnicity and gender in medical domain as in a 50 year-old white female patient . Yet general lexicons such as WordNet Miller et al. 1990 and COMLEX Grishman et al. 1994 do not store such information. In this paper we present automated techniques for addressing this problem of determining given two premodifiers A and B the preferred ordering between them. Our methods rely on and generalize empirical evidence obtained from large corpora and are evaluated objectively on such corpora. They are informed and motivated by our practical need for ordering multiple premodifiers in the MAGIC system Dalal et al. 1996 . MAGIC utilizes .

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