R-KV: Redundancy-aware KV Cache Compression for Training-Free Reasoning Models Acceleration - Cai, Zefan; Xiao, Wen; Sun, Hanshi; Luo, Cheng; Zhang, Yikai; Wan, Ke; Li, Yucheng; Zhou, Yeyang; Chang, Li-Wen; Gu, Jiuxiang; Dong, Zhen; Anandkumar, Anima; et al. (2025)