task_categories:visual-question-answering task_categories:image-text-to-text language:en license:apache-2.0 size_categories:1M<n<10M format:parquet modality:image modality:text library:datasets library:dask library:polars library:mlcroissant arxiv:2601.13606 region:us chart reasoning vision-language multimodal chart-understanding CoT SFT large-scale