Inverse reinforcement learning is the problem of inferring the reward function of an observed agent, given its policy or behavior. Researchers perceive IRL both as a problem and as a class of methods. By categorically surveying the current literature in IRL, this article serves as a reference for researchers and practitioners in machine learning to understand the challenges of IRL and select the approaches best suited for the problem on hand. The survey formally introduces the IRL problem along with its central challenges which include accurate inference, generalizability, correctness of prior knowledge, and growth in solution complexity with problem size. The article elaborates how the current methods mitigate these challenges. We further discuss the extensions of traditional IRL methods: (i) inaccurate and incomplete perception, (ii) incomplete model, (iii) multiple rewards, and (iv) non-linear reward functions. This discussion concludes with some broad advances in the research area and currently open research questions.

本文对逆强化学习领域的现有文献进行了分类调查，介绍了IRL问题和其挑战，讨论了目前的解决方法，并探讨了处理传感不准确、不完整的模型、多个奖励函数和非线性奖励函数等问题的方法，同时总结了该领域的研究进展和当前未解决的问题。

逆强化学习综述：挑战、方法与进展