task_categories:text-generation task_categories:reinforcement-learning language:code license:cc-by-4.0 size_categories:100K<n<1M format:parquet modality:text library:datasets library:pandas library:polars library:mlcroissant arxiv:2505.21297 region:us code coding reasoning reinforcement-learning rlhf rstar-coder test-case-based verl