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Few-shot relation classification based on the BERT model, hybrid attention and fusion networks

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Abstract

Relation classification (RC) is an essential task in information extraction. The distance supervision (DS) method can use many unlabeled data and solve the lack of training data on the RC task. However, the DS method has the problems of long tails and noise. Intuitively, people can solve these problems using few-shot learning (FSL). Our work aims to improve the accuracy and rapidity of convergence on the few-shot RC task. We believe that entity pairs have an essential role in the few-shot RC task. We propose a new context encoder, which is improved based on the bidirectional encoder representations from transformers (BERT) model to fuse entity pairs and their dependence information in instances. At the same time, we design hybrid attention, which includes support instance-level and query instance-level attention. The support instance level dynamically assigns the weight of each instance in the support set. It makes up for the insufficiency of prototypical networks, which distribute weights to sentences equally. Query instance-level attention is dynamically assigned weights to query instances by similarity with the prototype. The ablation study shows the effectiveness of our proposed method. In addition, a fusion network is designed to replace the Euclidean distance method of previous works when class matching is performed, improving the convergence’s rapidity. This makes our model more suitable for industrial applications. The experimental results show that the proposed model’s accuracy is better than that of several other models.

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Data openly available in a public repository.

Notes

  1. https://github.com/thunlp/FewRel

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Acknowledgements

This paper was supported by the Exercise and Health Laboratory of the Institute of Intelligent Machinery, Chinese Academy of Sciences. Thanks to Tsinghua University for developing the FewRel dataset. We would like to thank the anonymous reviewers for their helpful comments.

Funding

This research was supported by the National Key Research and Development Program of China (2022YFC2010200, 2020YFC2005603), the National Natural Science Foundation of China (NSFC) (grant numbers 61701482), the Key projects of the National Natural Science Foundation of universities in Anhui Province (grant number KJ2020A0112),the Major Special Projects of Anhui Province(grant number 202103a07020004), the Natural Science Foundation of Anhui Province, China (grant number 1808085MF191),the Education Research Project of Anhui Province, China(2020jyxm1573) and the High-level Talents Research Start-up Fund of Hefei Normal University (grant number 2020rcjj45). In addition, we would like to thank the anonymous reviewers who have helped to improve the paper.

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Authors and Affiliations

  1. Institute of Intelligent Machines, Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China

    Yibing Li, Zenghui Ding, Zuchang Ma, Yichen Wu, Yu Wang & Ruiqi Zhang

  2. Science Island Branch of Graduate School, University of Science and Technology of China, Hefei, 230026, China

    Yibing Li, Yichen Wu, Yu Wang & Ruiqi Zhang

  3. School of Computer Science and Technology, Hefei Normal University, Hefei, 230601, China

    Yibing Li, Fei Xie & Xiaoye Ren

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  1. Yibing Li
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Li, Y., Ding, Z., Ma, Z. et al. Few-shot relation classification based on the BERT model, hybrid attention and fusion networks. Appl Intell 53, 21448–21464 (2023). https://doi.org/10.1007/s10489-023-04634-0

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