Table 5.

Existing work categorized by sensor modality and data labeling.

Sensor Modality	Informed Supervised	Uninformed Supervised	Informed Unsupervised	Uninformed Unsupervised
Video	(Cao et al., 2010; Duan et al., 2010; Lam et al., 2011; Nater et al., 2011; Xian-ming and Shao-zi, 2009; Yang et al., 2007; Yang et al., 2011)	(Cao et al., 2010; Farhadi and Tabrizi, 2008; Liu et al., 2011; Wei and Pal, 2011; Wu et al., 2010)	-	-
Wearable	(Blanke and Schiele, 2010; Chieu et al., 2006; Pan et al., 2006; Pan et al., 2007; Pan, Zheng, Yang and Hu, 2008; Venkatesan, 2011; Venkatesan et al., 2010; Yang, 2009; Zheng et al., 2008)	(Hachiya et al., 2012; Hu and Yang, 2011; Hu et al., 2010; Krishnan, 2010; Pan et al., 2011; Pan, Shen, Yang and Kwok, 2008; Pan, Zheng, Yang and Hu, 2008; Yang, 2009; Zhao et al., 2010; Zhao et al., 2011; Zheng et al., 2009)	-	(Pan et al., 2011)
Ambient	(Rashidi and Cook, 2010a; Rashidi and Cook, 2010b; Rashidi and Cook, 2011)	(Cook, 2010; Hu and Yang, 2011; Hu et al., 2010; Rashidi and Cook, 2009; Rashidi and Cook, 2010a; Rashidi and Cook, 2010b; Rashidi and Cook, 2011; van Kasteren et al., 2008; van Kasteren et al., 2010; Zheng et al., 2009)	-	-