Learning policies for complex tasks that require multiple different skills is a major challenge in reinforcement learning (RL). It is also a requirement for its deployment in real-world scenarios. This paper proposes a novel framework for efficient multi-task reinforcement learning. Our framework trains agents to employ hierarchical policies that decide when to use a previously learned policy and when to learn a new skill. This enables agents to continually acquire new skills during different stages of training. Each learned task corresponds to a human language description. Because agents can only access previously learned skills through these descriptions, the agent can always provide a human-interpretable description of its choices. In order to help the agent learn the complex temporal dependencies necessary for the hierarchical policy, we provide it with a stochastic temporal grammar that modulates when to rely on previously learned skills and when to execute new skills. We validate our approach on Minecraft games designed to explicitly test the ability to reuse previously learned skills while simultaneously learning new skills.

本文提出了一种用于有效的多任务强化学习的新框架，该框架可以训练代理人使用分层策略，决定何时使用先前学习的策略和何时学习新技能。该方法通过给代理人提供随机时间语法来帮助代理人学习分层策略中必要的复杂时间依赖关系，并在Minecraft游戏中进行了验证。

多任务强化学习中的层次和可解释技能获取