汉语概率型上下文无关语法的自动推导

本文提出了一种汉语概率型上下文无关语法的自动推导方法，它在匹配分析机制上实现了无指导的ＥＭ迭代训练算法，并通过对训练语料的自动短语界定预处理以及在集成不同知识源基础上构造合适始规则集

AN INFERENCE APPROACH FOR CHINESE PROBABILISTIC CONTEXT-FREE GRAMMAR

This paper proposes a new inference approach for Chinese probabilisticcontext-free grammar, which implements the EM algorithm based on the bracketmatching schemes. Two characteristics of the algorithm are as follows: 1) To pre-process the training texts with automatic constituent boundary prediction tools,which can provide stronger syntactic restriction upon training texts in lower compu-tational costs; 2) To develop an initial rule set by integrating different knowledgeresources, including a set of basic syntactic rules generated by an automatic gram-mar construction t00l and a set of special rules summarized by linguists or extractedfrom treebanks, and provide a better initialization for the learning process. There-fore, a linguistically-motivated and broad-coverage Chinese PCFG rule set can beeasily generated through this algorithm. Current experimental results prove goodlearning efficiency of this algorithm and high reliability of the generated rule set.