Table 2.

The statistic of DDIExtraction 2013 dataset.

Types	Training Set		Test Set
	Original	Filtered	Original	Filtered
DDI pairs	27,792	23,010	5716	4721
Positive	4020	3998	979	976
Negative	23,772	19,012	4737	3745
Advice	826	822	221	221
Effect	1687	1669	360	360
Mechanism	1319	1319	302	299
Int	188	188	96	96