An Overview of Biomolecular Event Extraction from Scientific Documents

Table 2

Most relevant work addressing the problem of trigger detection. Studies are listed in chronological order and the different approaches are classified in three main groups: rule-based, dictionary-based, and ML-based strategies.

Approach						Reference
Rule-based	Dictionary-based	ML-based
		SVM	CRF	VSM	MEMM
X	X					Kilicoglu and Bergler 2009 [84]
	X		X			MacKinlay et al. 2009 [85]
		X (structural)	X			Björne et al. 2009 [86]
	X					Miwa et al. 2010 [87]
X	X					Le Minh et al. 2011 [70]
X	X	X				Kilicoglu and Bergler 2011 [79]
X						Casillas et al. 2011 [88]
X		X (L, R)				Van Landeghem et al. 2011 [74]
		X (P)	X	X (CS)		Martinez and Baldwin 2011 [73]
					X	Zhou and He 2011 [89]
		X (L)				Miwa et al. 2012 [75]
		X (L)				Björne et al. 2012 [64]
		X (C)				Qian and Zhou 2012 [90]
		X (L)				Wang et al. 2013 [65]
		X (L)				Hakala et al. 2013 [91]
		X (L)				Zhang et al. 2013 [43]
		X (L)				Liu et al. 2013 [72]
			X			Campos et al. 2014 [42]
		X (L)				Xia et al. 2014 [92]

L: linear kernel; R: radial basis function kernel; P: polynomial kernel; C: convolution tree kernel; CS: cosine similarity.