Papers › Hierarchical Deep Counterfactual Regret Minimization
Hierarchical Deep Counterfactual Regret Minimization
Jiayu Chen, Tian Lan, Vaneet Aggarwal
Imperfect Information Games (IIGs) offer robust models for scenarios where decision-makers face uncertainty or lack complete information. Counterfactual Regret Minimization (CFR) has been one of the most successful family of algorithms for tackling IIGs. The integration of skill-based strategy learning with CFR could potentially mirror more human-like decision-making process and enhance the learning performance for complex IIGs. It enables the learning of a hierarchical strategy, wherein low-level components represent skills for solving subgames and the high-level component manages the transition between skills. In this paper, we introduce the first hierarchical version of Deep CFR (HDCFR), an innovative method that boosts learning efficiency in tasks involving extensively large state spaces and deep game trees. A notable advantage of HDCFR over previous works is its ability to facilitate learning with predefined (human) expertise and foster the acquisition of skills that can be transferred to similar tasks. To achieve this, we initially construct our algorithm on a tabular setting, encompassing hierarchical CFR updating rules and a variance-reduced Monte Carlo sampling extension. Notably, we offer the theoretical justifications, including the convergence rate of the proposed updating rule, the unbiasedness of the Monte Carlo regret estimator, and ideal criteria for effective variance reduction. Then, we employ neural networks as function approximators and develop deep learning objectives to adapt our proposed algorithms for large-scale tasks, while maintaining the theoretical support.
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