Ma, T. and Chen, J. (2021) “Unsupervised Learning of Graph Hierarchical Abstractions with Differentiable Coarsening and Optimal Transport”, Proceedings of the AAAI Conference on Artificial Intelligence, 35(10), pp. 8856-8864. Available at: https://ojs.aaai.org/index.php/AAAI/article/view/17072 (Accessed: 18August2022).