反馈式K近邻语义迁移学习的领域命名实体识别

Domain-named entity recognition based on feedback K-nearest semantic transfer learning

领域命名实体识别是构建领域知识图谱的重要基础。针对专业领域语料匮乏的特点,构建基于深度学习的BiLSTM-CNN-CRFs网络模型,并提出一种反馈式K近邻语义迁移学习的领域命名实体识别方法。首先,对专业领域语料和通用领域语料分别训练得到语料文档向量,使用马哈拉诺比斯距离计算领域语料与通用语料的语义相似性,针对每个专业领域样本分别取K个语义最相似的通用领域样本进行语义迁移学习,构建多个迁移语料集。然后,使用BiLSTM-CNN-CRFs网络模型对迁移语料集进行领域命名实体识别,并对识别结果进行评估和前馈,根据反馈结果选取合适的K值,作为语义迁移学习的最佳阈值。以包装领域和医疗领域为例进行实验验证,结果表明:本文方法取得了很好的识别效果,可以有效解决专业领域语料匮乏问题。

Domain-named entity recognition is an important foundation in constructing domain knowledge maps.In view of the scarcity of such recognition,this paper constructs a BiLSTM-CNN-CRFs network model based on deep learning as well as proposes a domain-named entity recognition method based on feedback K-nearest-neighbor semantic transfer learning.First,the corpus of the professional field and the general field were trained to obtain the corpus document vector,and the semantic similarity between the corpus of a domain and the common corpus was calculated using the Mahalanobis distance calculation.For each specialized domain sample,K common domain samples with the most similar semantics were taken for semantic transfer learning,and several transfer corpus sets were constructed.Then,the BiLSTM-CNN-CRFs network model was used to identify domain-named entities in N migration corpuses and evaluate and feedforward the recognition results.An appropriate K value was selected as the best threshold for semantic transfer learning according to the feedback results.The packaging and medical fields were taken as examples for experimental verification.The results showed that the method proposed in this paper has a good recognition effect and can effectively solve the problem of lack of corpus in the field of specialization.