Table 6.

Performance comparison of different algorithms

	P	R	F1
N-gram-Based RNN-CRF [23]	0.5254	0.4056	0.4578
Character-Based LSTM-CRF [11]	0.6568	0.6904	0.6732
Attention-Based CNN-LSTM-CRF [21]	0.7224	0.7248	0.7236
SM-LSTM-CRF	0.8054	0.7961	0.8007