Prepositional Phrase Attachment through a Backed-Off Model

Michael Collins; James Brooks

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arXiv · cmp-lg/9506021

Prepositional Phrase Attachment through a Backed-Off Model

Michael Collins·James Brooks

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Abstract

Recent work has considered corpus-based or statistical approaches to the problem of prepositional phrase attachment ambiguity. Typically, ambiguous verb phrases of the form {v np1 p np2} are resolved through a model which considers values of the four head words (v, n1, p and n2). This paper shows that the problem is analogous to n-gram language models in speech recognition, and that one of the most common methods for language modeling, the backed-off estimate, is applicable. Results on Wall Street Journal data of 84.5% accuracy are obtained using this method. A surprising result is the importance of low-count events - ignoring events which occur less than 5 times in training data reduces performance to 81.6%.

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Michael Collins, James Brooks. 1995-06-22. Prepositional Phrase Attachment through a Backed-Off Model. https://arxiv.org/abs/cmp-lg/9506021

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