It reflects the approximate upper bound of AnsAcc, as the correctness of SQL-related words is a prerequisite of correct execution in most cases; BLEU, referring to the cumulative 4-gram BLEU score, evaluates how similar the predicted queries are to the golden ones (Papineni et al., 2002).
let f j = softmax(A :,j ), where f j ∈ R n denotes the attention weights on x according to y j .