TAILIEUCHUNG - Báo cáo khoa học: "Conceptual Coherence in the Generation of Referring Expressions"

One of the challenges in the automatic generation of referring expressions is to identify a set of domain entities coherently, that is, from the same conceptual perspective. We describe and evaluate an algorithm that generates a conceptually coherent description of a target set. The design of the algorithm is motivated by the results of psycholinguistic experiments. | Conceptual Coherence in the Generation of Referring Expressions Albert Gatt Department of Computing Science University of Aberdeen agatt@ Kees van Deemter Department of Computing Science University of Aberdeen kvdeemte@ Abstract One of the challenges in the automatic generation of referring expressions is to identify a set of domain entities coherently that is from the same conceptual perspective. We describe and evaluate an algorithm that generates a conceptually coherent description of a target set. The design of the algorithm is motivated by the results of psycholinguistic experiments. 1 Introduction Algorithms for the Generation of Referring Expressions GRE seek a set of properties that distinguish an intended referent from its distractors in a knowledge base. Much of the GRE literature has focused on developing efficient content determination strategies that output the best available description according to some interpretation of the Gricean maxims Dale and Reiter 1995 especially Brevity. Work on reference to sets has also proceeded within this general framework van Deemter 2002 Gardent 2002 Horacek 2004 . One problem that has not received much attention is that of conceptual coherence in the generation of plural references . the ascription of related properties to elements of a set so that the resulting description constitutes a coherent cover for the plurality. As an example consider a reference to e1 e3 in Table 1 using the Incremental Algorithm IA Dale and Reiter 1995 . IA searches along an ordered list of attributes selecting properties of the intended referents that remove some distractors. Assuming the ordering in the top row IA would yield the postgraduate and the chef which is fine in case occupation is the relevant attribute in the discourse but otherwise is arguably worse than an alternative like the Italian and the maltese because it is more difficult to see what a postgraduate and a chef have in common. type .

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