task_categories:question-answering task_ids:extractive-qa task_ids:open-domain-qa task_ids:conversational annotations_creators:crowdsourced language_creators:found multilinguality:monolingual source_datasets:squad source_datasets:quac source_datasets:coqa language:en license:mit size_categories:100K<n<1M arxiv:1806.03822 arxiv:1808.07036 arxiv:1808.07042 region:us question-answering conversational-ai nlp english