A Multichannel Biomedical Named Entity Recognition Model Based on Multitask Learning and Contextualized Word Representations

Table 8

Performance comparison of model with and without CRF layer.

	Precision	Recall	F1-score
JNLPBA
BiGRU	70.8	73.7	72.3
BiGRU-CRF	72.6	79.6	76.0
	+1.8	+5.9	+3.7
NCBI-disease
BiGRU	82.4	86.7	84.5
BiGRU-CRF	88.2	89.2	88.7
	+5.8	+2.5	+4.2