What is fc_self? So as far as I understand fc_neigh is a linear NN layer through which the feature vectors of the node’s neighbors are passed. But what is fc_self linear layer and why is it not used with aggregation type GCN?
fc_self is a linear NN layer through which the old node representations are passed. You can view that as a skip connection for preserving the original node representations before the GNN layer.
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