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 2109.02791cs.ROcs.FLcs.LG
收藏

基于时序逻辑规范的机器人控制安全临界学习

Safety-Critical Learning of Robot Control with Temporal Logic Specifications

Lehigh University(里海大学)

Mingyu Cai, Cristian-Ioan Vasile

摘要:

强化学习是一种很有前途的学习方法。然而,成功仅限于现实世界的应用,因为确保安全探索和促进充分利用是一个挑战,控制机器人系统与未知的模型和测量不确定性。对于连续状态动作的复杂任务,学习问题变得更加困难。在本文中,我们提出了一个基于学习的机器人控制框架,包括几个方面:(1)我们利用线性时序逻辑(LTL)来表达复杂的任务在无限的视野,被翻译成一个新的自动机结构;(2)我们详细介绍了一个创新的奖励计划,LTL满意度的概率保证。然后,通过应用奖励塑造技术,我们开发了一个模块化的策略梯度架构,利用自动机结构的好处来分解整体任务,提高学习控制器的性能;(3)引入高斯过程(GPs)对不确定动态系统进行估计,我们在学习过程中使用指数控制障碍函数(ECBF)合成了基于模型的安全探索,该函数概括了具有高(4)为了进一步提高搜索效率,利用LTL自动机和ECBF的性质,提出了一种安全的引导过程。最后,我们通过几个机器人环境证明了该框架的有效性。我们展示了一种基于ECBF的模块化深度RL算法,该算法在训练过程中实现了近乎完美的成功率和高概率置信度的安全防护。

英文摘要:

Reinforcement learning (RL) is a promising approach. However, success is limited to real-world applications, because ensuring safe exploration and facilitating adequate exploitation is a challenge for controlling robotic systems with unknown models and measurement uncertainties. The learning problem becomes even more difficult for complex tasks over continuous state-action. In this paper, we propose a learning-based robotic control framework consisting of several aspects: (1) we leverage Linear Temporal Logic (LTL) to express complex tasks over infinite horizons that are translated to a novel automaton structure; (2) we detail an innovative reward scheme for LTL satisfaction with a probabilistic guarantee. Then, by applying a reward shaping technique, we develop a modular policy-gradient architecture exploiting the benefits of the automaton structure to decompose overall tasks and enhance the performance of learned controllers; (3) by incorporating Gaussian Processes (GPs) to estimate the uncertain dynamic systems, we synthesize a model-based safe exploration during the learning process using Exponential Control Barrier Functions (ECBFs) that generalize systems with high-order relative degrees; (4) to further improve the efficiency of exploration, we utilize the properties of LTL automata and ECBFs to propose a safe guiding process. Finally, we demonstrate the effectiveness of the framework via several robotic environments. We show an ECBF-based modular deep RL algorithm that achieves near-perfect success rates and safety guarding with high probability confidence during training.

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。

↑