Knowledge bases (KBs) (such as Freebase (Dong et al., 2015;Xu et al., 2016;Yao and Van Durme, 2014) or DBpedia (Lopez et al., 2010;Unger et al., 2012)) have been used for question answering (Yu and Lam, 2018).
the ever-changing nature of online businesses, where new products and services appear constantly, makes it prohibitive to build a highquality KB to cover all new products and services.