Reinforcement learning is a promising framework for solving control problems, but its use in practical situations is hampered by the fact that reward functions are often difficult to engineer. Specifying goals and tasks for autonomous machines, such as robots, is a significant challenge: conventionally, reward functions and goal states have been used to communicate objectives. But people can communicate objectives to each other simply by describing or demonstrating them. How can we build learning algorithms that will allow us to tell machines what we want them to do? In this work, we investigate the problem of grounding language commands as reward functions using inverse reinforcement learning, and argue that language-conditioned rewards are more transferable than language-conditioned policies to new environments. We propose language-conditioned reward learning (LC-RL), which grounds language commands as a reward function represented by a deep neural network. We demonstrate that our model learns rewards that transfer to novel tasks and environments on realistic, high-dimensional visual environments with natural language commands, whereas directly learning a language-conditioned policy leads to poor performance.

本研究探讨了使用反强化学习将语言命令作为奖励函数的问题，并提出了一种将语言命令作为深度神经网络表示的奖励函数的学习算法，即语言条件奖励学习（LC-RL）。实验结果表明，与直接学习语言条件策略相比，使用LC-RL学习的奖励可以更好地在新任务和环境中进行迁移。

从语言到目标：基于视觉的逆强化学习指令跟随