Decision-making is challenging in robotics environments with continuous object-centric states, continuous actions, long horizons, and sparse feedback. Hierarchical approaches, such as task and motion planning (TAMP), address these challenges by decomposing decision-making into two or more levels of abstraction. In a setting where demonstrations and symbolic predicates are given, prior work has shown how to learn symbolic operators and neural samplers for TAMP with manually designed parameterized policies. Our main contribution is a method for learning parameterized polices in combination with operators and samplers. These components are packaged into modular neuro-symbolic skills and sequenced together with search-then-sample TAMP to solve new tasks. In experiments in four robotics domains, we show that our approach -- bilevel planning with neuro-symbolic skills -- can solve a wide range of tasks with varying initial states, goals, and objects, outperforming six baselines and ablations. Video: https://youtu.be/PbFZP8rPuGg Code: https://tinyurl.com/skill-learning

本研究中，通过将符号操作和神经采样器与参数化策略相结合，将它们打包成模块化的神经符号技能，并将其顺序化组合为搜索-采样二层任务和动作规划来解决新任务。在四个机器人领域的实验中，展示了具有神经符号技能的二层规划策略能够解决各种具有不同初始状态、目标和对象的任务，优于六个基线和消融。

学习神经符号技能以进行双层规划