Research on Named Entity Recognition Method of Metro On-Board Equipment Based on Multiheaded Self-Attention Mechanism and CNN-BiLSTM-CRF

Table 1

Parameter setting.

Parameter	Value
Batch_size	64
Learning rate	8e − 4
Hidden layer dimension	128
Epoch	25
LSTM_dim	128
cnn_size	64
attention_heads	8
kernel_size	(3, 4, 5)
Activation function	Relu
Max_seq_len	128
Dropout	0.5
Loss function	Cross entropy