task_categories:text-generation language:en license:odc-by size_categories:100K<n<1M format:parquet modality:text library:datasets library:pandas library:polars library:mlcroissant arxiv:2402.13753 region:us cosmo 100M parquet large-text-corpus general-text web-crawl cleaned-text pretraining-data unsupervised-learning nlp open-dataset language-model-training