基于依存分析的中文时间表达式类型判定

某些“基数词+时间单位词”组成的中文时间表达式在不同语境中可能表现为时点式，也可能表现为时段式。为自动判定中文时间表达式的类型，提出一种基于依存分析的判定方法。该方法首先借助依存分析考察中文时间表达式在句中所受的句法约束，然后将这些约束转化为具有可计算性的依存规则，最后利用依存规则对中文时间表达式的类型进行判定。实验结果显示，在此方法中，时间表达式确认的正确率、召回率、F值分别达到82.3%、88.1%和85.1%；时间表达式类型判定的正确率、召回率、F值分别达到77.1%、82.5%和79.7%。

Classification of Chinese time expressions based on dependency parsing

Some Chinese time expressions consisting of "cardinal+time unit word" may be time point expressions or time slot expressions in different context. An approach of classification of Chinese time expressions based on dependency parsing was proposed, for the purpose of automatic classification of Chinese time expressions. First some syntactic constraints of Chinese time expressions in sentences were found with the help of dependency parsing. Then some computable dependency rules were extracted from those syntactic constraints. Finally the classification of Chinese time expressions was executed using dependency rules. The experimental results show that in this approach the precision, recall, F-Measure of the confirmation are 82.3%, 88.1%, 85.1%; and the precision, recall, F-Measure of the classification are 77.1%, 82.5%, 79.7%.