The Disambiguation Strategy of Semantic Analysis in Spoken Dialogue Systems
Limin Du · Zhongwen xinxi xuebao · 2005
Frame semantic analysis is one of the most commonly used semantic analysis method in Chinese spoken dialogue systems research. And the two typical ambiguous structures encountered in semantic analysis are outer-ambiguity and structural-ambiguity. According to the features of these two ambiguous structures, this paper puts forth the semantic PCFG model based disambiguation strategy to solve structural-ambiguity and the semantic Expectation Model (EM) integrated disambiguation strategy to solve outer-ambiguity. Efficient algorithms of these two methods are also provided. The experimental results show that synthetically use of these two disambiguation methods can most greatly improve the performance of the understanding module of the base-line system. The sentence accuracy is improved from 75.7% to 91.5%, and the three targets of semantic understanding rate-correction, recall, and precision are also improved 10% averagely.