命名实体识别实践（LSTM+CRF）_命名实体识别 lstm crf

任务场景

实体识别是一个经典的序列标注任务，如果有一批已经标注的样本，就可以考虑使用模型来进行训练了，传统的方式是用CRF++进行训练随着深度学习技术的兴起，任务也基本围绕着基础的LSTM+CRF的基础上或者进行微调。本文中实现了其基础版本。

    def buildd_model(self):
        """NER 模型建立"""
        inpute_ = layers.Input((self.max_sentence_len,))
        embed  =  layers.Embedding(input_dim=self.word_num, output_dim=200,mask_zero=True)(inpute_)

        lstm_encode = layers.Bidirectional(layers.LSTM(units=100, return_sequences=True,
                                                       dropout=0.3, recurrent_dropout=0.05))(embed)
        dense1 = layers.TimeDistributed(layers.Dense(50,activation="tanh"))(lstm_encode)
        dense1 = layers.Dropout(0.05)(dense1)
        # dense1 = layers.Dense(units=64,activation="tanh")(dense1)
        crf = CRF(self.class_num, sparse_target=False)
       
        crf_res = crf(dense1)
        model = Model(inpute_, crf_res)
        adam = Adam(lr=0.001)
        model.compile(optimizer=adam, loss=crf.loss_function, metrics=[crf.accuracy])
        print(model.summary())
        return model

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效果：