arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2103.02727cs.ROcs.HC
收藏

基于偏好的奖励函数特征学习

Preference-based Learning of Reward Function Features

Stanford University(斯坦福大学)

Sydney M. Katz, Amir Maleki, Erdem Bıyık, Mykel J. Kochenderfer

摘要:

奖励函数的基于偏好的学习,其中奖励函数是使用比较数据学习的,已经为复杂的机器人任务(如自动驾驶)进行了很好的研究。现有的算法都集中在学习奖励函数,是线性的轨迹特征的集合。这些特征通常是手工编码的,并且基于偏好的学习用于确定特定用户对每个特征的相对权重。设计一组代表性的特征来编码奖励是具有挑战性的,并且可能导致不准确的模型,无法对用户的偏好进行建模或正确执行任务。在本文中,我们提出了一种方法来学习功能之间的相对权重,以及其他功能,帮助编码用户的奖励功能。附加特征被建模为神经网络,该神经网络在来自成对比较查询的数据上进行训练。我们将我们的方法应用于以前工作中使用的驾驶场景,并将我们的方法的预测能力与仅手动编码的功能进行比较。我们执行额外的分析来解释学习的特征并检查最佳轨迹。我们的研究结果表明,向奖励模型添加额外的学习功能可以增强其预测能力和表达能力,为每个用户产生独特的结果。

英文摘要:

Preference-based learning of reward functions, where the reward function is learned using comparison data, has been well studied for complex robotic tasks such as autonomous driving. Existing algorithms have focused on learning reward functions that are linear in a set of trajectory features. The features are typically hand-coded, and preference-based learning is used to determine a particular user's relative weighting for each feature. Designing a representative set of features to encode reward is challenging and can result in inaccurate models that fail to model the users' preferences or perform the task properly. In this paper, we present a method to learn both the relative weighting among features as well as additional features that help encode a user's reward function. The additional features are modeled as a neural network that is trained on the data from pairwise comparison queries. We apply our methods to a driving scenario used in previous work and compare the predictive power of our method to that of only hand-coded features. We perform additional analysis to interpret the learned features and examine the optimal trajectories. Our results show that adding an additional learned feature to the reward model enhances both its predictive power and expressiveness, producing unique results for each user.

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。

↑