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Investigating annotation noise for named entity recognition

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Abstract

Recent studies revealed that even the most widely used benchmark dataset still contains more than 5% sample-level annotation noise in Named Entity Recognition (NER). Hence, we investigate annotation noise in terms of noise detection and noise-robust learning. First, considering that noisy labels usually occur when few or vague annotation cues appear in annotated texts and their contexts, an annotation noise detection model is constructed based on self-context contrastive loss. Second, an improved Bayesian neural network (BNN) is presented by adding a learnable systematic deviation term into the label generation processing of classical BNN. In addition, two learning strategies of systematic deviation items based on the output of the noise detection model are proposed. Experimental results of our proposed noise detection model show an improvement of up to 7.44% F1 on CoNLL03 than the existing method. Extensive experiments on two widely used but noisy benchmarks for NER, CoNLL03 and WNUT17 demonstrate that our proposed systematic deviation BNN has the potential to capture systematic annotation mistakes, and it can be extended to other areas with annotation noise.

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Notes

  1. https://github.com/pfliu-nlp/Named-Entity-Recognition-NER-Papers/blob/master/ner_dataset.md.

  2. In our experiments, BiLSTM-CRF is not inferior to BiLSTM-BNN. Therefore, we conjectured that CRF can alleviate partial negative effects of random noise modeled by existing BNN.

  3. Our code is available at https://github.com/ruby-yu-zhu/Annotation_Noise_NER.

  4. https://www.clips.uantwerpen.be/conll2003/ner/.

  5. https://nlp.stanford.edu/projects/glove/.

  6. https://github.com/flairNLP/flair.

  7. https://github.com/huggingface/transformers.

  8. SeqEval package were used to calculate F1 metric.

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Funding

The funding was provided by National Nature Science Foundation of China (62076178), Natural Science Foundation of Tianjin City (19ZXAZNGX00050), Zhijiang Fund (2019KB0AB03).

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Authors and Affiliations

  1. National Center for Applied Mathematics, Tianjin University, Weijin Road, Tianjin, 300072, China

    Yu Zhu, Yingchun Ye, Mengyang Li & Ou Wu

  2. Jiuantianxia Inc., Jinguan North Second Street, Beijing, 100102, China

    Mengyang Li

  3. Zhejiang Lab, Wenyi West Road, Hangzhou, 311100, Zhejiang, China

    Ji Zhang

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  1. Yu Zhu
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Zhu, Y., Ye, Y., Li, M. et al. Investigating annotation noise for named entity recognition. Neural Comput & Applic 35, 993–1007 (2023). https://doi.org/10.1007/s00521-022-07733-0

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