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arXiv cs/0105016cs.CL
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概率自顶向下分析和语言建模

Probabilistic top-down parsing and language modeling

Brian Roark

摘要:

本文描述了一个广泛覆盖的概率自顶向下分析器的功能,以及它在语音识别语言建模问题中的应用。本文首先介绍了语言建模和概率分析的关键概念,并简要回顾了一些以前的方法,使用语法结构的语言建模。一个词汇化的概率自上而下的解析器,它表现得非常好,在返回的解析的准确性和效率,他们发现,相对于最好的广泛覆盖的统计解析器。一个新的语言模型,它利用概率自顶向下的分析,然后概述,和实证结果表明,它改善了以前的工作在测试语料库的困惑。插值与三元模型产生一个特殊的改善相对于其他模型观察到的改善,展示了我们的解析模型捕获的信息是正交的三元模型捕获的程度。一个小型的识别实验也证明了该模型的实用性。

英文摘要:

This paper describes the functioning of a broad-coverage probabilistic top-down parser, and its application to the problem of language modeling for speech recognition. The paper first introduces key notions in language modeling and probabilistic parsing, and briefly reviews some previous approaches to using syntactic structure for language modeling. A lexicalized probabilistic top-down parser is then presented, which performs very well, in terms of both the accuracy of returned parses and the efficiency with which they are found, relative to the best broad-coverage statistical parsers. A new language model which utilizes probabilistic top-down parsing is then outlined, and empirical results show that it improves upon previous work in test corpus perplexity. Interpolation with a trigram model yields an exceptional improvement relative to the improvement observed by other models, demonstrating the degree to which the information captured by our parsing model is orthogonal to that captured by a trigram model. A small recognition experiment also demonstrates the utility of the model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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