task_categories:video-text-to-text task_categories:image-text-to-text task_categories:text-generation source_datasets:ActivityNet Captions language:en license:apache-2.0 size_categories:100K<n<1M format:parquet format:optimized-parquet modality:text library:datasets library:pandas library:polars library:mlcroissant arxiv:2509.16538 region:us video-captioning caption-evaluation factual-grounding synthetic-data instruction-tuning multimodal