4D-VLA: Spatiotemporal Vision-Language-Action Pretraining with Cross-Scene Calibration - Zhang, Jiahui; Chen, Yurui; Xu, Yueming; Huang, Ze; Zhou, Yanpeng; Yuan, Yu-Jie; Cai, Xinyue; Huang, Guowei; Quan, Xingyue; Xu, Hang; Zhang, Li (Advances in Neural Information Processing Systems, 2025)