Can You Unpack That? Learning to Rewrite Questions-in-Context

Question answering is an AI-complete problem, but existing datasets lack key elements of language understanding such as coreference and ellipsis resolution. We consider sequential question answering: multiple questions are asked one-by-one in a conversation between a questioner and an answerer. Answering these questions is only possible through understanding the conversation history. We introduce the task of question-in-context rewriting: given the context of a conversation's history, rewrite a context-dependent into a selfcontained question with the same answer. We construct, CANARD, a dataset of 40,527 questions based on QUAC (Choi et al., 2018) and train Seq2Seq models for incorporating context into standalone questions.