Summary of several graph neural network methods


Recurrent Graph Neural Network



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Recurrent Graph Neural Network


RecGNN is built with an assumption of Banach Fixed-Point Theorem. Banach Fixed-Point Theorem states that: Let (X,d) be a complete metric space and let (T:X→X) be a contraction mapping. Then T has a unique fixed point (x) and for any xX the sequence T_n(x) for n→∞ converges to (x). This means if I apply the mapping on x for times, x^k should be almost equal to x^(k-1), i.e.:



RecGNN defines a parameterized function f_w:



where l_n, l_co, x_ne, l_ne represents the features of the current node [n], the edges of the node [n], the state of the neighboring nodes, and the features of the neighboring nodes. (In the original paper, the author referred node features as node labels. This might make some confusion.)



Finally, after k iterations, the final node state is used to produce an output to make a decision about each node. The output function is defined as:



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