Based on Freebase, two benchmark data-sets, WebQuestions (Berant et al., 2013) and SimpleQuestions (Bordes et al., 2015) are constructed and used in most of KBQA work (Berant and Liang, 2014;Bordes et al., 2014a;Fader et al., 2014;Yang et al., 2014;Bao et al., 2014;Reddy et al., 2014;Dong et al., 2015;Yih et al., 2015).
mark Rydell  about 85% of questions (Yao, 2015) of WebQuestions and all questions in SimpleQuestions are 'simple' questions, where a 'simple' question denotes that it can be answered based on a single KB relation.