TAILIEUCHUNG - Báo cáo khoa học: "Quantifying lexical influence: Giving direction to context"

The relevance of context in disambiguating natural language input has been widely acknowledged in the literature. However, most attempts at formalising the intuitive notion of context tend to treat the word and its context symmetrically. We demonstrate here that traditional measures such as mutual information score are likely to overlook a significant fraction of all co-occurrence phenomena in natural language. We also propose metrics for measuring directed lexical influence and compare performances. Keywords: contextual post-processing, defining context, lexical influence, directionality of context | Quantifying lexical influence Giving direction to context V Kripảsundar CEDAR Dept of Computer Science SUNY at Buffalo Buffalo NY 14260 USA Abstract The relevance of context in disambiguating natural language input has been widely acknowledged in the literature. However most attempts at formalising the intuitive notion of context tend to treat the word and its context symmetrically. We demonstrate here that traditional measures such as mutual information score are likely to overlook a significant fraction of all co-occurrence phenomena in natural language. We also propose metrics for measuring directed lexical influence and compare performances. Keywords contextual post-processing defining context lexical influence directionality of context 1 Introduction It is widely accepted that context plays a significant role in shaping all aspects of language. Indeed comprehension would be utterly impossible without the extensive application of contextual information. Evidence from psycholinguistic and cognitive psychological studies also demonstrates that contextual information affects the activation levels of lexical candidates during the process of perception Weinreich 1980 McClelland 1987 . Garvin 1972 describes the role of context as follows The meaning of a particular text is not the system-derived meaning as a whole but that part of it which is included in the contextually and situationally derived meaning proper to the text in question p. 6970 In effect this means that the context of a word serves to restrict its sense. The problem addressed in this research is that of improving the performance of a natural-language recogniser such as a recognition system for handwritten or spoken language . The recogniser output typically consists of an ordered set of candidate words word-choices for each word position in the input stream. Since natural language abounds in contextual information it is reasonable to utilise this in improving the performance of the

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