论文标题
通过分散的原型增强了实体级原型网络的几个命名实体识别
Few-shot Named Entity Recognition with Entity-level Prototypical Network Enhanced by Dispersedly Distributed Prototypes
论文作者
论文摘要
几个名称的实体识别（NER）使我们能够使用很少的标记示例为新域构建一个NER系统。但是，该任务的现有原型网络具有大致估计的标签依赖性和紧密分布的原型，因此常常导致错误分类。为了解决上述问题，我们提出了EP-NET，这是一个实体级原型网络，通过分散分布的原型增强。 EP-NET构建实体级原型，并认为文本跨度为候选实体，因此它不再需要标签依赖性。此外，EP-NET从头开始训练原型，以分散分配它们，并使用空间投影将跨度与嵌入空间中的原型对齐。两项评估任务和少量网络设置的实验结果表明，EP-NET在整体性能方面始终优于先前的强大模型。广泛的分析进一步验证了EP-NET的有效性。
Few-shot named entity recognition (NER) enables us to build a NER system for a new domain using very few labeled examples. However, existing prototypical networks for this task suffer from roughly estimated label dependency and closely distributed prototypes, thus often causing misclassifications. To address the above issues, we propose EP-Net, an Entity-level Prototypical Network enhanced by dispersedly distributed prototypes. EP-Net builds entity-level prototypes and considers text spans to be candidate entities, so it no longer requires the label dependency. In addition, EP-Net trains the prototypes from scratch to distribute them dispersedly and aligns spans to prototypes in the embedding space using a space projection. Experimental results on two evaluation tasks and the Few-NERD settings demonstrate that EP-Net consistently outperforms the previous strong models in terms of overall performance. Extensive analyses further validate the effectiveness of EP-Net.
