task_categories:text-generation task_categories:question-answering language:ko language:en license:cc-by-nc-sa-4.0 size_categories:100K<n<1M format:json modality:tabular modality:text library:datasets library:pandas library:mlcroissant library:polars arxiv:2112.00861 arxiv:2001.08435 region:us human feedback rlhf preferences reddit preference model RL NLG evaluation