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

Table 3

Details of DDI corpus.

Data set	Number of documents	Number of sentences	Number of NEs in each class				Total number of Named Entities
			Drug	Group	Brand	Drug_n
Train
DrugBank	572	5675	8197	3206	1423	103	12929
Medline	142	1301	1228	193	14	401	1836
Test
DrugBank	54	145	180	65	53	5	303
Medline	58	520	171	90	6	115	382