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arXiv cs/0105019cs.CL
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鲁棒概率预测句法处理

Robust Probabilistic Predictive Syntactic Processing

Brian Roark

摘要:

本论文提出一个广泛覆盖的机率自顶向下分析器,并将其应用于语音识别的语言模型问题。解析器从左到右遍历字符串,一次就增量地构建完全连接的派生。我们认为,我们所采用的分析方法是动机良好的心理语言学的角度来看,作为一个模型,捕捉词汇项目之间的概率依赖关系,作为建立连接的句法结构的过程的一部分。给出了基本的句法分析器和条件概率模型,并对报纸文本和自发电话会话的句法分析准确性进行了实验研究。概率模型的修改,导致改善的性能。然后定义使用解析器的输出的新的语言模型。困惑和字出错率降低证明了在trigram模型,即使当trigram是在显着更多的数据上训练。使用三元模型在逐词的基础上进行插值会产生额外的改进。

英文摘要:

This thesis presents a broad-coverage probabilistic top-down parser, and its application to the problem of language modeling for speech recognition. The parser builds fully connected derivations incrementally, in a single pass from left-to-right across the string. We argue that the parsing approach that we have adopted is well-motivated from a psycholinguistic perspective, as a model that captures probabilistic dependencies between lexical items, as part of the process of building connected syntactic structures. The basic parser and conditional probability models are presented, and empirical results are provided for its parsing accuracy on both newspaper text and spontaneous telephone conversations. Modifications to the probability model are presented that lead to improved performance. A new language model which uses the output of the parser is then defined. Perplexity and word error rate reduction are demonstrated over trigram models, even when the trigram is trained on significantly more data. Interpolation on a word-by-word basis with a trigram model yields additional improvements.

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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