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仿真到现实因果迁移:一种用于因果感知交互表示的度量学习方法

Sim-to-Real Causal Transfer: A Metric Learning Approach to Causally-Aware Interaction Representations

École Polytechnique Fédérale de Lausanne(瑞士联邦理工学院);Stanford University(斯坦福大学);ETH Zurich(苏黎世联邦理工学院)

Ahmad Rahimi, Po-Chien Luan, Yuejiang Liu, Frano Rajič, Alexandre Alahi

AI总结:

本文研究多智能体交互表示的因果感知不足问题,提出基于因果标注的度量学习正则化及跨域多任务仿真到现实迁移方法,提升了间接因果建模、分布外鲁棒性与无真实因果标注时的泛化能力。

摘要:

对相邻智能体之间的时空交互进行建模,是运动预测和人群导航等多智能体问题的核心。尽管已取得显著进展,但现代表示能够在多大程度上捕捉智能体交互背后的因果关系,仍不清楚。在本工作中,我们从计算形式化到现实实践,深入考察这些表示的因果感知能力。首先,我们对近期 CausalAgents 基准所研究的非因果鲁棒性概念提出质疑。我们表明,近期表示已经对非因果智能体的扰动具有部分韧性,但对涉及中介智能体的间接因果效应进行建模仍然具有挑战性。为应对这一挑战,我们引入一种度量学习方法,利用因果标注对潜在表示进行正则化。受控实验表明,该方法不仅带来更高程度的因果感知,还产生更强的分布外鲁棒性。为进一步在实践中落地,我们提出一种通过跨域多任务学习实现的仿真到现实因果迁移方法。在行人数据集上的实验表明,即使不存在现实世界因果标注,我们的方法也能显著提升泛化能力。我们希望本工作为多智能体交互的因果感知表示所面临的挑战和实现路径提供新视角。代码可在 https://github.com/vita-epfl/CausalSim2Real 获取。

英文摘要:

Modeling spatial-temporal interactions among neighboring agents is at the heart of multi-agent problems such as motion forecasting and crowd navigation. Despite notable progress, it remains unclear to which extent modern representations can capture the causal relationships behind agent interactions. In this work, we take an in-depth look at the causal awareness of these representations, from computational formalism to real-world practice. First, we cast doubt on the notion of non-causal robustness studied in the recent CausalAgents benchmark. We show that recent representations are already partially resilient to perturbations of non-causal agents, and yet modeling indirect causal effects involving mediator agents remains challenging. To address this challenge, we introduce a metric learning approach that regularizes latent representations with causal annotations. Our controlled experiments show that this approach not only leads to higher degrees of causal awareness but also yields stronger out-of-distribution robustness. To further operationalize it in practice, we propose a sim-to-real causal transfer method via cross-domain multi-task learning. Experiments on pedestrian datasets show that our method can substantially boost generalization, even in the absence of real-world causal annotations. We hope our work provides a new perspective on the challenges and pathways towards causally-aware representations of multi-agent interactions. Our code is available at https://github.com/vita-epfl/CausalSim2Real.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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