Multi-hop QA based on Entity-GCN [1] on graphs completed with R-GCN[2].
[1] Cao, Nicola De et al. “Question Answering by Reasoning Across Documents with Graph Convolutional Networks.” NAACL-HLT (2018).
[2] Schlichtkrull, Michael et al. “Modeling Relational Data with Graph Convolutional Networks.” The Semantic Web, Lecture Notes in Computer Science, pages 593–607. Springer International Publishing, 2018.