Table 3.

CHEMDNER dataset characteristics.

Dataset Statistics	Dataset for Training	Dataset for Development	Dataset for Testing	Total Dataset
Abstracts	3500	3500	3000	10,000
No. of Characters	4,883,753	4,864,558	4,199,068	13,947,379
No. of Tokens	770,855	766,331	662,571	2,199,757
Abstracts with classes	2916	2907	2478	8301
No. of Mentions	29,478	29,526	25,351	84,355
No. of Chemicals	8520	8677	7563	19,805
No. of Journals	193	188	188	203