https://towardsdatascience.com/an-intuitive-explanation-of-graphsage-6df9437ee64f https://towardsdatascience.com/using-graphsage-to-learn-paper-embeddings-in-cora-a94bb1e9dc9d https://github.com/stellargraph/stellargraph/issues/457 https://github.com/williamleif/GraphSAGE/issues/93