基于依存分析和错误驱动的中文时间表达式识别

时间表达式识别是进行时间表达式归一化的基础,其识别结果的好坏直接影响归一化的效果。本文提出一种基于依存分析和错误驱动识别中文时间表达式的新方法。首先以时间触发词为切入点,据依存关系递归地识别时间表达式,大大地提高了识别效果;然后,采用错误驱动学习来进一步增强识别效果,根据错误识别结果和人工标注的差异自动地获取和改进规则,使系统的性能又提高了近3.5%。最终在封闭测试集和开放测试集上,F₁值达到了76.38%和76.57%。

Recognizing the Extent of Chinese Time Expressions Based on the Dependency Parsing and Error-Driven Learning

Recognizing time expressions is the foundation of its normalization,and its performance directly influences the robustness of the normalization.This paper proposes a new method for recognizing the extents of the time expressions based on dependency parsing and error-driven learning,which begins with time trigger word(namely,the syntactic head of dependency relation),uses Chinese dependency parsing to recognize the extents of the time expressions,Subsequently,we use the transformation-based error-driven learning to improve the performance.,which can automatically acquire and modify the rules and get 3.5% increase after applying the learned rules.Finally,F1 = 76.38% and F1 =76.57% results are obtained on the closed and the open test set respectively.