生物事件触发词识别方法研究

Research on Tagging Biomedical Event Trigger

从生物文献中抽取生物事件对于生物领域的知识挖掘起着重要的作用,而事件触发词的识别是生物事件抽取的一个关键步骤。系统分别采用词汇及其上下文特征、短语标记特征、词聚类特征以及统计的词典特征构造不同的基于词级的CRF模型,用于生物事件触发词的标记。然后针对不同的触发词类型选择对应最优的标记模型,构造了一个混合CRF模型。在BioNLP 2009ST语料库上进行了实验评估,结果表明提出的方法取得了很好的性能,为生物事件的抽取建立了良好的基础。

Event extraction from biomedical literature plays an important role in the knowledge mining in biomedical do- main. The trigger identification is the key step in biomedical event extraction. We used rich features including lemma, context, phrase label, word cluster and learned trigger dictionary to build several kinds of CRF models. Then we chose the best model for each type of triggers to combine a hybrid model. The evaluation on the BioNLP 2009 ST data set shows that our approach achieves good performance,which lays foundation for biomedical event extraction.