Answering multi-relation questions over knowledge graphs is a challenging task as it requires multi-step reasoning over a huge number of possible paths. Reasoning-based methods with complex reasoning mechanisms, such as reinforcement learning-based sequential decision making, have been regarded as the default pathway for this task. However, these mechanisms are difficult to implement and train, which hampers their reproducibility and transferability to new domains. In this paper, we propose QAGCN - a simple but effective and novel model that leverages attentional graph convolutional networks that can perform multi-step reasoning during the encoding of knowledge graphs. As a consequence, complex reasoning mechanisms are avoided. In addition, to improve efficiency, we retrieve answers using highly-efficient embedding computations and, for better interpretability, we extract interpretable paths for returned answers. On widely adopted benchmark datasets, the proposed model has been demonstrated competitive against state-of-the-art methods that rely on complex reasoning mechanisms. We also conducted extensive experiments to scrutinize the efficiency and contribution of each component of our model.

本研究提出了QAGCN——一种简单而有效的使用注意力图卷积网络的多步推理问题答案推导模型，避免了传统复杂推理机制的不稳定性和低至。经过广泛的实验，我们证明了QAGCN在几个具有挑战性的数据集上与当前最先进的基于深度强化学习的方法相比非常有竞争力，提高了效率并保持了高的解释性。

QAGCN：基于图卷积网络的多关系问题回答系统