
This article systematically examines HAII techniques in RL through both theoretical analysis and practical case studies. We establish a conceptual framework built upon three fundamental pillars of effective human-AI collaboration: computational trust modeling, system usability, and decision understandability. Our comprehensive review organizes HAII methods into five key categories: (1) learning from human feedback, including various shaping approaches; (2) learning from human demonstration through inverse RL and imitation learning; (3) shared autonomy architectures for dynamic control allocation; (4) human-in-the-loop querying strategies for active learning; and (5) explainable RL techniques for interpretable policy generation.
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