制御変数を用いたシミュレーション支援強化学習
Simulation-aided Reinforcement Learning with Control Variates
シミュレータのデータを学習目標の直接的な形成ではなく分散低減にのみ用いる制御変数ベースの手法を提案し、方策評価・actor-critic・オフラインRLへ拡張してMuJoCoで有効性を示した論文。
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著者: Omer Hemo, Ido Sefi, Mirco Mutti, Aviv Tamar, Kfir Y. Levy
分類: cs.LG, cs.RO
原文アブストラクト
Reinforcement Learning (RL) algorithms often rely on data collected from a target environment, which can be expensive and noisy. Although simulators can generate large amounts of additional data, standard simulation mixing approaches, which directly combine simulated and real experience, can degrade performance due to simulator inaccuracies, especially when they bias the solution away from the optimal policy. We propose a conservative simulation-aided learning method based on control variates, where simulated data is used solely to reduce variance in the learning process rather than directly shaping the learning target. We develop our approach for Policy-Evaluation, which is a fundamental building block of RL algorithms. Then we combine it within the actor-critic framework towards policy improvement, as well as extend it towards offline RL scenarios. Experiments on multiple MuJoCo benchmark tasks demonstrate improvements over standard simulation mixing approaches, highlighting control variates as an effective tool for simulation-aided reinforcement learning.