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

Table 5

Recognition effect of different named entity recognition models on other nonentity tags O.

Models	O
	P (%)	R (%)	F1 (%)
HMM	97.70	92.76	95.17
CRF	94.99	97.91	96.43
BiLSTM	95.20	97.63	96.40
BiLSTM-CRF	95.26	98.64	96.92
BiLSTM-CNN-CRF	96.59	98.79	97.01
BiLSTM-CNN-MHA-CRF	96.37	98.87	97.60