VIS-Shepherd: Constructing Critic for LLM-based Data Visualization Generation. - Bo Pan; Yixiao Fu; Ke Wang; Junyu Lu; Lunke Pan; Ziyang Qian; Yuhan Chen; Guoliang Wang; Yitao Zhou; Li Zheng; Yinghao Tang; Zhen Wen; et al. (CoRR, 2025)