Dongjie Zhu 0001 Yundong Sun Haiwen Du Zhaoshuo Tian MHNF: Multi-hop Heterogeneous Neighborhood information Fusion graph representation learning. 2021 abs/2106.09289 CoRR https://arxiv.org/abs/2106.09289 db/journals/corr/corr2106.html#abs-2106-09289