Before revision:  Since collecting labeled decompositions is cumbersome, we propose an unsupervised approach to produce sub-questions . Specifically, by leveraging >10M questions from Common Crawl, we learn to map from the distribution of multi-hop questions to the distribution of single-hop sub-questions.
After revision:  Since collecting labeled decompositions is cumbersome, we propose an unsupervised approach to produce sub-questions . Specifically, by leveraging >10M questions from Common Crawl, we learn to map from the distribution of multi-hop question to many simpler, single-hop sub-questions.