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• W129342743 abstract "Word sense disambiguation has been recognized as a major problem in natural language processing research for over forty years. Much of this work has been stymied by difficulties in acquiring appropriate lexical resources, such as semantic networks and annotated corpora. Following the suggestion in Brown et al. (1991a) and Dagan et al. (1991), we have achieved considerable progress recently by taking advantage of a new source of testing and training materials. Rather than depending on small amounts of hand-labeled text, we have been making use of relatively large amounts of parallel text, text such as the Canadian Hansards (parliamentary debates), which are available in two (or more) languages. The translation can often be used in lieu of hand-labeling. For example, consider the polysemous word sentence, which has two major senses: (1) a judicial sentence, and (2), a syntactic sentence. We can collect a number of sense (1) examples by extracting instances that are translated as peine, and we can collect a number of sense (2) examples by extracting instances that are translated as phrase. In this way, we have been able to acquire a considerable amount of testing and training material for developing and testing our disambiguation algorithms. The availability of this testing and training material has enabled us to develop quantitative disambiguation methods that achieve 90% accuracy in discriminating between two very distinct senses of a noun such as sentence. In the training phase, we collect a number of instances of each sense of the polysemous noun. Then in the testing phase, we are given a new instance of the noun, and are asked to assign the instance to one of the senses. We attempt to answer this question by comparing the context of the unknown instance with contexts of known instances using a Bayesian argument that has been applied successfully in related applications such as author identification and information retrieval. The final section of the paper will describe a number of methodological studies which show that the training set need not be large and that it need not be free from errors. Perhaps most surprisingly, we find that the context should extend ±50 words, an order of magnitude larger than one typically finds in the literature. 1. Word-Sense Disambiguation Consider, for example, the word duty which has at least two quite distinct senses: (1) a tax and (2) an obligation. Three examples of each sense are given in Table 1 below. The classic disambiguation problem is to construct a means for discriminating between two or more sets of examples such as those shown in Table 1. This paper will focus on the methodology required to address the classic problem, and will have less to say about the details required for practical application of this methodology. Consequently, me reader should exercise some caution in interpreting the 90% figure reported here; this figure could easily be swamped out in a practical system by any number of factors that go beyond the scope of this paper. In particular, the Canadian Hansards, one of just the few currently available sources of parallel text, is extremely unbalanced, and is therefore severely limited as a basis for a practical disambiguation system." @default.
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• W129342743 date "2005-01-01" @default.
• W129342743 modified "2023-09-24" @default.
• W129342743 title "Using Bilingual Materials to Develop Word Sense Disambiguation Methods" @default.
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