In our experiments, we apply a 2-layer GCN to the extended graph.
2 our GCN performs the following computation, yielding a softmax distribution over the 3 classes in the dataset for each of the nodes: We set the input feature vectors in F to be the binary bag-of-words representations of the nodes (following Kipf and Welling 2017); for author nodes, these representations are constructed over the entire set of their respective tweets.