@article{sketchvlpolicyoptimizationviafinegrained,
  title = {SketchVL: Policy Optimization via Fine-Grained Credit Assignment for Chart Understanding and More},
  author = {Muye Huang and Lingling Zhang and Yifei Li and Yaqiang Wu and Jun Liu},
  year = {2026},
  eprint = {2601.05688},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2601.05688},
}