HopaDIFF: Holistic-Partial Aware Fourier Conditioned Diffusion for Referring Human Action Segmentation in Multi-Person Scenarios - Peng, Kunyu; Huang, Junchao; Huang, Xiangsheng; Wen, Di; Zheng, Junwei; Chen, Yufan; Yang, Kailun; Wu, Jiamin; Hao, Chongqing; Stiefelhagen, Rainer (Advances in Neural Information Processing Systems, 2025)