Table 2.

Experiment results on the test set with comparison.

Method	Precision	Recall	F1 score
Distantly LSTMa-CRFb	74.03	31.59	53.93
AdaPU	70.15	60.87	65.18
Novel label-back AutoNER	73.06	66.75	69.18
BERTc-CRF	75.62	58.73	66.15
Our method	78.28	76.52	77.34

^aLSTM: long short-term memory.

^bCRF: conditional random field.

^cBERT: bidirectional encoder representations from transformers.