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arXiv · 2204.05751

Decomposed Meta-Learning for Few-Shot Named Entity Recognition

Tingting Ma·Huiqiang Jiang·Qianhui Wu·Tiejun Zhao·Chin-Yew Lin
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Abstract

Few-shot named entity recognition (NER) systems aim at recognizing novel-class named entities based on only a few labeled examples. In this paper, we present a decomposed meta-learning approach which addresses the problem of few-shot NER by sequentially tackling few-shot span detection and few-shot entity typing using meta-learning. In particular, we take the few-shot span detection as a sequence labeling problem and train the span detector by introducing the model-agnostic meta-learning (MAML) algorithm to find a good model parameter initialization that could fast adapt to new entity classes. For few-shot entity typing, we propose MAML-ProtoNet, i.e., MAML-enhanced prototypical networks to find a good embedding space that can better distinguish text span representations from different entity classes. Extensive experiments on various benchmarks show that our approach achieves superior performance over prior methods.

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Tingting Ma, Huiqiang Jiang, Qianhui Wu, Tiejun Zhao, Chin-Yew Lin. 2022-04-12. Decomposed Meta-Learning for Few-Shot Named Entity Recognition. https://arxiv.org/abs/2204.05751

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