Large-scale knowledge bases (KBs), such as Freebase [Bollacker et al., 2008] , WordNet<cite> [Miller, 1995]</cite> , Yago<cite> [Suchanek et al., 2007]</cite> , and NELL [Carlson et al., 2010] , are critical to natural language processing applications, e.g., question answering [Dong et al., 2015] , relation extraction<cite> [Riedel et al., 2013]</cite> , and language modeling [Ahn et al., 2016] .