ChemTok: A New Rule Based Tokenizer for Chemical Named Entity Recognition

Table 9

Class based performance (-score in %) for SemEval DDI data set; DrugBank, Medline.

Algorithm	Entity type	DrugBank			Medline
		ChemSpot	tmVar	ChemTok	ChemSpot	tmVar	ChemTok
CRF	Group	76.33	72.86	79.16	62.41	59.25	64.31
	Drug_n	0.0	0.0	0.0	10.44	13.63	12.48
	Brand	86.31	80.85	89.97	0.0	0.0	0.0
	Drug	89.77	86.85	91.32	74.57	74.22	76.15
SVM	Group	83.82	83.58	85.12	46.28	44.06	49.13
	Drug_n	0.0	0.0	0.0	10.93	11.02	11.67
	Brand	92.15	94.11	93.45	0.0	0.0	0.0
	Drug	91.66	89.32	93.52	68.04	67.06	71.71