NLP/Event-Extraction
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### Closed-domain
Closed-domain event extraction uses predefined event schema to discover and extract desired events of particular type from text. An event schema contains several event types and their corresponding event structures. We use the ACE terminologies to introduce an event structure as follows:
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<a href="https://www.aclweb.org/anthology/P16-1116" >RBPB Regularization Based Pattern Balancing Method for Event Extraction,ACL2016(<a href="https://link.zhihu.com/?target=https%3A//github.com/231sm/Low_Resource_KBP">Github</a>)</summary><blockquote><p align="justify">
动机：在最近的工作中，当确定事件类型（触发器分类）时，大多数方法要么是仅基于模式（pattern），要么是仅基于特征。此外，以往的工作在识别和文类论元的时候，忽略了论元之间的关系，只是孤立的考虑每个候选论元。
![image](https://github.com/xiaoqian19940510/Event-Extraction/blob/master/figure1.png)
主要思想：在本文中，我们同时使用‘模式’和‘特征’来识别和分类‘事件触发器’。 此外，我们使用正则化方法对候选自变量之间的关系进行建模，以提高自变量识别的性能。 我们的方法称为基于正则化的模式平衡方法。