Copying mechanism was proved effective on text summarization tasks (See et al., 2017;Gu et al., 2016) and semantic parsing tasks (Jia and Liang, 2016).
the usage of the non-public CLC corpus (Nicholls, 2003) and self-collected non-public error-corrected sentence pairs from Lang-8 made their training data 3.6 times larger than the others and their results hard to compare.