Inferring interactions from multi-agent trajectories has broad applications in physics, vision and robotics. Neural relational inference (NRI) is a deep generative model that can reason about relations in complex dynamics without supervision. In this paper, we take a careful look at this approach for relational inference in multi-agent trajectories. First, we discover that NRI can be fundamentally limited without sufficient long-term observations. Its ability to accurately infer interactions degrades drastically for short output sequences. Next, we consider a more general setting of relational inference when interactions are changing overtime. We propose an extension ofNRI, which we call the DYnamic multi-AgentRelational Inference (DYARI) model that can reason about dynamic relations. We conduct exhaustive experiments to study the effect of model architecture, under-lying dynamics and training scheme on the performance of dynamic relational inference using a simulated physics system. We also showcase the usage of our model on real-world multi-agent basketball trajectories.

本文介绍了神经关系推理(NRI)模型在多智能体轨迹的关系推理领域的应用。作者发现没有足够长期的记录会严重损害 NRI 模型的推理结果，为此提出了一种叫做DYARI模型的扩展模型，能够处理关系动态变化的情况。作者通过对模型结构、底层动态和训练方案的详细研究，并在模拟物理系统和真实多智能体篮球轨迹上验证了 DYARI 模型的有效性。

多智能体轨迹中的动态关系推断