task_categories:question-answering task_categories:text-generation task_categories:fill-mask task_ids:open-domain-qa task_ids:dialogue-modeling annotations_creators:crowdsourced language_creators:crowdsourced multilinguality:monolingual source_datasets:original language:en license:cc-by-4.0 size_categories:10K<n<100K arxiv:1910.03262 region:us