All You Need is One: Capsule Prompt Tuning with a Single Vector - Liu, Yiyang; Liang, James; Fan, Heng; Yang, Wenhao; Cui, Yiming; Han, Xiaotian; Huangg, Lifu; Liu, Dongfang; Wang, Qifan; Han, Cheng (Advances in Neural Information Processing Systems, 2025)