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arXiv 2212.09586cs.ROcs.AIcs.LG
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学习潜在表征以与人类协同适应

Learning Latent Representations to Co-Adapt to Humans

Virginia Tech(弗吉尼亚理工大学)

Sagar Parekh, Dylan P. Losey

AI总结:

提出 RILI 框架,通过学习人类潜在策略及动态表征来预测并引导人类行为,使机器人在仿真和真实用户任务中实现协同适应。

摘要:

当机器人在家庭、道路或工厂中与人类互动时,人类的行为往往会因机器人而发生变化。非平稳人类对机器人学习器构成挑战:在人类适应机器人之后,机器人已学会与原始人类协调的动作可能会失效。本文提出一种算法形式化框架,使机器人(即自我智能体)能够仅利用机器人的低层状态、动作和奖励,与动态人类(即其他智能体)协同适应。一个核心挑战在于,人类不仅会对机器人的行为作出反应,而且其反应方式不可避免地会随时间变化,并因用户而异。为应对这一挑战,我们的洞见是:机器人不必构建人类的精确模型,而可以学习并推理人类策略及策略动态的高层表征。应用这一洞见,我们开发了 RILI:Robustly Influencing Latent Intent(鲁棒地影响潜在意图)。RILI 首先将低层机器人观测嵌入到对人类潜在策略及策略动态的预测中。接着,RILI 利用这些预测选择动作,在重复互动中影响具有适应性的人类,使其趋向有利、高奖励的行为。我们证明,在 RILI 对从某个底层分布中采样的用户所测得性能的基础上,可以概率性地界定 RILI 对从同一分布采样的新人类的期望性能。仿真实验将 RILI 与最先进的表征学习和强化学习基线进行比较,结果表明 RILI 能更好地学会与不完美、有噪声且随时间变化的智能体协调。最后,我们开展了两项用户研究,让 RILI 在捉人游戏和搭塔任务中与真实人类协同适应。用户研究视频见:https://youtu.be/WYGO5amDXbQ

英文摘要:

When robots interact with humans in homes, roads, or factories the human's behavior often changes in response to the robot. Non-stationary humans are challenging for robot learners: actions the robot has learned to coordinate with the original human may fail after the human adapts to the robot. In this paper we introduce an algorithmic formalism that enables robots (i.e., ego agents) to co-adapt alongside dynamic humans (i.e., other agents) using only the robot's low-level states, actions, and rewards. A core challenge is that humans not only react to the robot's behavior, but the way in which humans react inevitably changes both over time and between users. To deal with this challenge, our insight is that -- instead of building an exact model of the human -- robots can learn and reason over high-level representations of the human's policy and policy dynamics. Applying this insight we develop RILI: Robustly Influencing Latent Intent. RILI first embeds low-level robot observations into predictions of the human's latent strategy and strategy dynamics. Next, RILI harnesses these predictions to select actions that influence the adaptive human towards advantageous, high reward behaviors over repeated interactions. We demonstrate that -- given RILI's measured performance with users sampled from an underlying distribution -- we can probabilistically bound RILI's expected performance across new humans sampled from the same distribution. Our simulated experiments compare RILI to state-of-the-art representation and reinforcement learning baselines, and show that RILI better learns to coordinate with imperfect, noisy, and time-varying agents. Finally, we conduct two user studies where RILI co-adapts alongside actual humans in a game of tag and a tower-building task. See videos of our user studies here: https://youtu.be/WYGO5amDXbQ

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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