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基于双过滤标签结构感知对比学习的隐式篇章关系识别

Implicit Discourse Relation Recognition Based on Dual-filter Label-aware Contrastive Learning

  • 摘要: 隐式篇章关系识别是篇章分析中一项具有挑战性和关键性的任务,旨在识别缺乏连接词的两个论元之间的语义逻辑关系。现有的一些方法倾向于将标签的信息整合到篇章关系表示中,然而它们对包含所有标签的全局结构建模不充分,并且忽略了篇章论元中与预测标签不相关的噪声信息。为了解决上述问题,该文提出了一种双过滤标签结构感知对比学习模型。首先,该模型使用改进的图编码器Graphormer对标签层次结构建模,获得更好的特定层级的标签表示。此外,为了过滤噪声信息,该文提出了标签结构感知对比学习,采用有监督和无监督相结合的过滤策略,学习到鲁棒性更强的篇章关系表征。在公开数据集上的实验结果表明,该模型在现有基线上达到了最优的表现。

     

    Abstract: Implicit discourse relation recognition is a challenging task in discourse analysis, which aims to identify the semantic logical relation between two arguments that lack connectives. To model the global hierarchy that contains all labels and ignore noise information in the discourse arguments, this paper proposes a Dual-Filter Label-aware Contrastive Learning model. First, the model uses an improved graph encoder named Graphormer to model the label hierarchy and obtain a better label representation. In addition, we proposed label-aware contrastive learning, and adopted a filter strategy combining supervised and unsupervised to learn more robust representation of discourse relations. Experimental results on open data sets show that the model achieves optimal performance on existing baselines.

     

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