现有的医疗实体识别模型当中，多数模型不能充分提取和利用文本序列当中词汇信息，且模型结构复杂，使得模型在面临医疗领域的文本时存在实体边界识别不准、鲁棒性较差等问题，并且多数基于字粒度的命名实体识别(Named Entity Recognition，NER)方法对信息遗漏此类问题解决不够完善。针对此类问题，本文提出了一种基于字词融合和对抗训练的命名实体识别模型。模型使用预训练模型BERT(Bidirectional Encoder Representation from Transformers)获取文本序列的字向量;然后使用SoftLexicon引入词典信息并在字向量中添加对抗训练生成的扰动样本;最后使用BiLSTM-CRF(Bi-Long Short-Term Memory-Condition Random Field)进行特征提取并获取序列标注结果。所提出模型在数据集CCKS2019和CCKS2020上进行实验，F1值分别到达了85。07％和90。39％。实验结果表明，与基准模型相比，该模型的F1值提升了2。31％和2。88％，说明字词融合方法和对抗训练相结合能够有效识别医疗实体。
Chinese Medical Named Entity Recognition Based on Soft-Lexicon and Adversarial Training
In existing medical entity recognition models,most of them cannot fully extract and utilize the lexical information in the text sequence,and their model structures are complex.This makes these models face problems such as inaccurate entity boundary recognition and poor robustness when dealing with medical texts.Additionally,most word-granularity based named entity recogni-tion(NER)methods are not perfect in solving the problem of information omission.To address these problems,a named entity rec-ognition model based on word fusion and adversarial training is proposed in this paper.The model uses a pre-trained model BERT to obtain word vectors of text sequences.Then the SoftLexicon is used to introduce lexical information and add perturbation samples generated by adversarial training to the word vectors.Finally,the BiLSTM-CRF is used to extract features and obtain sequence anno-tation results.The proposed model is experimented on the datasets CCKS2019 and CCKS2020,where the F1 values reach 85.07％and 90.39％,respectively.The experimental results show that compared with the baseline model,the F1 value of this model has in-creased by 2.31％and 2.88％,indicating that the combination of word fusion method and adversarial training can effectively identify medical entities.
named entity recognitionword and character fusionadversarial trainingProjected Gradient Descent(PGD)
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