FSD-CAP: Fractional Subgraph Diffusion with Class-Aware Propagation for Graph Feature Imputation - Qiao, Xin; Sun, Shijie; Dong, Anqi; Hua, Cong; Zhao, Xia; Zhang, Longfei; Zhu, Guangming; liang, zhang (International Conference on Learning Representations, 2026)