conv = Edge_GCNConv(1, 2, 1) # emb(in), emb(out), edge_dim x = conv(x, edge_index, edge_attr) Here we let in_channels = 1 & out_channels= 2, so we increase the dim from 1 to 2. And the edge_dim = 1 means each edge value's dim = 1. When we inputxandedge_index...