task_categories:video-text-to-text task_categories:visual-question-answering language:en license:apache-2.0 size_categories:100K<n<1M format:parquet modality:text modality:video library:datasets library:pandas library:polars library:mlcroissant arxiv:2605.20342 region:us video long-video reasoning tool-calling multimodal chain-of-thought agentic-rl