While GCNs were introduced  Baseline (Bastings et al., 2017) 14.9 12.6 +Sem 15.6 13.4 +Syn (Bastings et al., 2017) 16.1 13.7 +Syn + Sem 15.8 14.3 for modeling undirected unlabeled graphs (Kipf and Welling, 2016), in this paper we use a formulation of GCNs for labeled directed graphs, where the direction and the label of an edge are incorporated.
we follow the formulation of  and Bastings et al.