Table 2.

Performance comparison on DDIExtraction 2013 test set

	Method	Classification				Detection
		P	R	F-score	△	P	R	F-score
One-stage	SCNN1	0.691	0.651	0.670	7.6%	0.747	0.768	0.757
	UTurku (Björne et al., 2013A)	0.732	0.499	0.594		0.858	0.585	0.696
	NIL_UCM (Bokharaeian and Dıaz, 2013)	0.535	0.501	0.517		0.608	0.569	0.588
Two-stage	SCNN2	0.725	0.651	0.686	1.6%	0.775	0.769	0.772
	Kim et al., (2015)	–	–	0.670		–	–	0.775
	FBK-irst (Chowdhury and Lavelli, 2013)	0.646	0.656	0.651		0.794	0.806	0.800
	WBI (Thomas et al., 2013)	0.642	0.579	0.609		0.801	0.722	0.759

Notes. SCNN¹ denotes our SCNN-based one-stage method and SCNN² denotes our SCNN-based two-stage method. Δ denotes the performance improvement of SCNN¹ over UTurku, and SCNN² over that of Kim et al. (2015). The boldfaced numerals are the highest values in the corresponding column.