The proposed model differs from existing non-linear LSTM models such as Tree LSTM (Tai et al., 2015) and Graph LSTM (Liang et al., 2016) in addressing the mentioned problem.
tree LStM does not allow cycles, while the proposed model handles cycles by first using a combination of topological sort and breadth-first traversal over a graph, and then using an attention model to capture the global information of the knowledge graph.