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get the result of https://arxiv.org/abs/1801.00076
The reason and inspiration to use bi-directional attention is from the machine comprehension task. In the SQuAD [Rajpurkar et al. 2016] machine comprehension task, we input the paragraph and question to the model and find the answer string in the paragraph. And in the SQL generation task, we input the question and columns and find the answer column in the columns. The two task are similar in this view.