When Do Graph Neural Networks Help with Node Classification? Investigating the Homophily Principle on Node Distinguishability - Luan, Sitao; Hua, Chenqing; Xu, Minkai; Lu, Qincheng; Zhu, Jiaqi; Chang, Xiao-Wen; Fu, Jie; Leskovec, Jure; Precup, Doina (Advances in Neural Information Processing Systems, 2023)