python毕业设计&课设-基于BERT+BiLSTM+CRF实现中文命名实体识别（源码+文档）.zip
BERT+BiLSTM+CRF是一种用于中文命名实体识别（Named Entity Recognition，简称NER）的模型，结合了BERT模型、双向长短时记忆网络（Bidirectional LSTM）和条件随机场（CRF）。
BERT是一种预训练的深度双向变换器模型，具有强大的自然语言处理能力。它能够学习上下文相关的语义表示，对于NLP任务非常有用。
BiLSTM是一种循环神经网络，能够捕捉上下文之间的依赖关系。通过同时考虑前向和后向上下文，BiLSTM能够更好地理解句子中实体的边界和内部结构。
CRF是一种概率图模型，常用于序列标注任务。它能够基于输入序列和概率分布进行标签推断，使得预测的标签序列具有全局一致性。
在BERT+BiLSTM+CRF模型中，首先使用BERT模型提取句子中的特征表示。然后，将这些特征输入到BiLSTM中，通过双向上下文的学习，得到更丰富的句子表示。最后，使用CRF层对各个词的标签进行推断，并输出最终的实体识别结果。
这种模型的优势在于能够充分利用BERT的语义信息和BiLSTM的上下文依赖性，同时通过CRF层对标签进行约束，提高了实体识别的
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