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Efficient $Q$-Learning and Actor-Critic Methods for Robus...
Yang Xu, Swetha Ganesh, Vaneet Aggarwal · 2025-06-08 · via stat.ML updates on arXiv.org

We present a non-asymptotic convergence analysis of $Q$-learning and actor-critic algorithms for robust average-reward Markov Decision Processes (MDPs) under contamination, total-variation (TV) distance, and Wasserstein uncertainty sets. A key ingredient of our analysis is showing that the optimal robust $Q$ operator is a strict contraction with respect to a carefully designed semi-norm (with constant functions quotiented out). This property enables a stochastic approximation update that learns the optimal robust $Q$-function using $\tilde{\mathcal{O}}(ε^{-2})$ samples. We also provide an efficient routine for robust $Q$-function estimation, which in turn facilitates robust critic estimation. Building on this, we introduce an actor-critic algorithm that learns an $ε$-optimal robust policy within $\tilde{\mathcal{O}}(ε^{-2})$ samples. We provide numerical simulations to evaluate the performance of our algorithms.