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arXiv 2102.03483cs.AIcs.LGcs.RO
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面向自动驾驶汽车安全评估的角点案例生成与分析

Corner Case Generation and Analysis for Safety Assessment of Autonomous Vehicles

University of Michigan(密歇根大学);University of Michigan Transportation Research Institute(密歇根大学交通研究所)

Haowei Sun, Shuo Feng, Xintao Yan, Henry X. Liu

摘要:

测试和评估是开发和部署互联和自动驾驶汽车(CAV)的关键一步。为了全面评价CAV的性能,有必要在安全关键场景中测试CAV,这在自然驾驶环境中很少发生。因此,如何有目的、有系统地生成这些角点案例成为一个重要的问题。现有的研究主要集中在感知系统的对抗性样本生成方面,而决策系统的研究则相对较少,这也是本文的重点。由于CAV需要与大量的背景车辆(BV)进行长时间的交互,定义拐角情况的变量通常是高维的,这使得生成具有挑战性的问题。在本文中,提出了一个统一的框架来生成决策系统的角情况。为了解决高维性带来的挑战,基于马尔可夫决策过程对驾驶环境进行建模,并应用深度强化学习技术学习BVs的行为策略。通过学习策略,BV将更积极地与CAV进行行为和交互,从而导致更多的角落情况。为了进一步分析生成的角点情况,利用特征提取和聚类技术。通过选择每个聚类的代表性案例和离群值,可以从所有生成的角点案例中识别出有价值的角点案例。高速公路驾驶环境的仿真结果表明,所提出的方法可以有效地产生和识别有价值的角点情况。

英文摘要:

Testing and evaluation is a crucial step in the development and deployment of Connected and Automated Vehicles (CAVs). To comprehensively evaluate the performance of CAVs, it is of necessity to test the CAVs in safety-critical scenarios, which rarely happen in naturalistic driving environment. Therefore, how to purposely and systematically generate these corner cases becomes an important problem. Most existing studies focus on generating adversarial examples for perception systems of CAVs, whereas limited efforts have been put on the decision-making systems, which is the highlight of this paper. As the CAVs need to interact with numerous background vehicles (BVs) for a long duration, variables that define the corner cases are usually high dimensional, which makes the generation a challenging problem. In this paper, a unified framework is proposed to generate corner cases for the decision-making systems. To address the challenge brought by high dimensionality, the driving environment is formulated based on Markov Decision Process, and the deep reinforcement learning techniques are applied to learn the behavior policy of BVs. With the learned policy, BVs will behave and interact with the CAVs more aggressively, resulting in more corner cases. To further analyze the generated corner cases, the techniques of feature extraction and clustering are utilized. By selecting representative cases of each cluster and outliers, the valuable corner cases can be identified from all generated corner cases. Simulation results of a highway driving environment show that the proposed methods can effectively generate and identify the valuable corner cases.

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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