The last few years have witnessed significant progress on text-based machine reading comprehension and question answering (MRC-QA) including cloze-style blank-filling tasks (Hermann et al., 2015), open-domain QA (Yang et al., 2015), answer span prediction (Rajpurkar et al., 2016(Rajpurkar et al., , 2018, and generative QA (Nguyen et al., 2016).
all of the above datasets are confined to a single-document context per question setup.