Much of reinforcement learning theory is built on top of oracles that are computationally hard to implement. Specifically for learning near-optimal policies in Partially Observable Markov Decision Processes (POMDPs), existing algorithms either need to make strong assumptions about the model dynamics (e.g. deterministic transitions) or assume access to an oracle for solving a hard optimistic planning or estimation problem as a subroutine. In this work we develop the first oracle-free learning algorithm for POMDPs under reasonable assumptions. Specifically, we give a quasipolynomial-time end-to-end algorithm for learning in "observable" POMDPs, where observability is the assumption that well-separated distributions over states induce well-separated distributions over observations. Our techniques circumvent the more traditional approach of using the principle of optimism under uncertainty to promote exploration, and instead give a novel application of barycentric spanners to constructing policy covers.

该论文介绍了一种基于近似多项式时间算法的部分可观测马可夫决策过程无预言学习算法，该算法不是基于传统的探索-利用原则，而是采用几何拓扑中的重心跨度技术构建策略套接，并且通过对状态分布和观测分布的假设来保证合理性。

可观测POMDP中的学习, 无需计算难以处理的预言机