These KBs are useful resources in many applications such as semantic searching and ranking (Kasneci et al., 2008;Schuhmacher and Ponzetto, 2014;Xiong et al., 2017), question answering (Zhang et al., 2016;Hao et al., 2017) and machine reading (Yang and Mitchell, 2017).
the KBs are still incomplete, i.e., missing a lot of valid triples (Socher et al., 2013;West et al., 2014).