Knowledge graph question generation (QG) aims to generate natural language questions from KG and target answers. Most previous works mainly focusing on the simple setting are to generate questions from a single KG triple. In this work, we focus on a more realistic setting, where we aim to generate questions from a KG subgraph and target answers. In addition, most of previous works built on either RNN-based or Transformer-based models to encode a KG sugraph, which totally discard the explicit structure information contained in a KG subgraph. To address this issue, we propose to apply a bidirectional Graph2Seq model to encode the KG subgraph. In addition, we enhance our RNN decoder with node-level copying mechanism to allow directly copying node attributes from the input graph to the output question. We also explore different ways of initializing node/edge embeddings and handling multi-relational graphs. Our model is end-to-end trainable and achieves new state-of-the-art scores, outperforming existing methods by a significant margin on the two benchmarks.

本研究提出了一种基于bidirectional Graph2Seq模型和节点级别复制机制来生成知识图谱子图问题的方法，并在自动和人工评估中取得了最新的最好表现，并显示了该方法可以作为数据增强方法，从而持续有益于问答任务。

基于图神经网络的子图引导知识图谱问题生成