tailieunhanh - Báo cáo khoa học: "Word Sense Disambiguation Using Pairwise Alignment"

In this paper, we proposed a new supervised word sense disambiguation (WSD) method based on a pairwise alignment technique, which is used generally to measure a similarity between DNA sequences. The new method obtained improvements of the accuracy in our experiment for WSD. | Word Sense Disambiguation Using Pairwise Alignment Koichi Yamashita Keiichi Yoshida Yukihiro Itoh Faculty of Administration and Informatics University of Hamamatsu 1230 Miyakoda-cho Hamamatsu Shizuoka Japan yamasita@ Abstract In this paper we proposed a new supervised word sense disambiguation WSD method based on a pairwise alignment technique which is used generally to measure a similarity between DNA sequences. The new method obtained improvements of the accuracy in our experiment for WSD. 1 Introduction WSD has been recognized as one of the most important subjects in natural language processing especially in machine translation information retrieval and so on Ide and Veronis 1998 . Most of previous supervised methods can be classified into two major ones approach based on association and approach based on selectional restriction. The former uses some words around a target word represented by w-word window. The latter uses some syntactic relations say verb-object including necessarily a target word. However there are some words that one approach gets good result for them while another gets worse and vice versa. For example suppose that we want to distinguish between go off or discharge and terminate the employment as a sense of fire . Consider the sentence in Brown Corpus1 My Cousin Simmons carried a musket but he had loaded it with bird shot and as the officer came opposite him he rose up behind the wall and fired. 1In this case we consider only one sentential context for the simplicity. The words such as musket loaded and bird shot would seem useful in deciding the sense of fire and serve as clue to leading the sense to go off or discharge . It seems that there is no clue to another sense. For this case an approach based on association is useful for WSD. However an approach based on selectional restriction would not be appropriate because these clues do not have the direct syntactic dependencies on fire . On the other hand consider .