Online reinforcement learning (RL) methods are often data-inefficient or unreliable, making them difficult to train on real robotic hardware, especially quadruped robots. Learning robotic tasks from pre-collected data is a promising direction. Meanwhile, agile and stable legged robotic locomotion remains an open question in their general form. Offline reinforcement learning (ORL) has the potential to make breakthroughs in this challenging field, but its current bottleneck lies in the lack of diverse datasets for challenging realistic tasks. To facilitate the development of ORL, we benchmarked 11 ORL algorithms in the realistic quadrupedal locomotion dataset. Such dataset is collected by the classic model predictive control (MPC) method, rather than the model-free online RL method commonly used by previous benchmarks. Extensive experimental results show that the best-performing ORL algorithms can achieve competitive performance compared with the model-free RL, and even surpass it in some tasks. However, there is still a gap between the learning-based methods and MPC, especially in terms of stability and rapid adaptation. Our proposed benchmark will serve as a development platform for testing and evaluating the performance of ORL algorithms in real-world legged locomotion tasks.

以离线强化学习方向研究四足机器人腿部鲁棒动作，通过经典模型预测控制方法收集数据集，并与基于模型无关的在线强化学习方法进行对比，发现离线强化学习算法在某些任务上能够超越模型无关的在线强化学习算法，但在稳定性和快速适应性方面仍存在差距，该研究为测试和评估离线强化学习算法在实际四足机器人运动任务中的表现提供了一个发展平台。

一个离线强化学习的真实四足行动基准