For questions related to geometric deep learning, which is the application of deep learning techniques to non-Euclidean data (e.g. graphs and manifolds).
For more info, have a look at this question What is geometric deep learning? or the paper Geometric deep learning: going beyond Euclidean data (2017) by Michael M. Bronstein, Joan Bruna, Yann LeCun, Arthur Szlam, Pierre Vandergheynst.