(Step 2): Embedding. A crystal node's initial feature vector, v (0) i = f embed (x i ) is generated by an embedding function on a feature vector that depends only on the elemental identity of site i. In this case, x i is the ground state electron configuration utilized by SpookyNet, and f embed is a feed forward neural network layer. An image node's initial feature vector is equivalent to that of the path's endpoints such that v