Before revision:  We answer sub-questions with an off-the-shelf QA model and incorporate the resulting answers in a downstream, multi-hop QA system. On a popular multi-hop QA dataset, HotpotQA, we show large improvements over a strong baseline , especially on adversarial and out-of-domain questions.
After revision:  We answer sub-questions with an off-the-shelf QA model and incorporate the resulting answers to a recomposition model that combines them into a final answer. We show large QA improvements on HotpotQA over a strong baseline , especially on adversarial and out-of-domain questions.