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Xing Lei

2 papers indexed

arxivcs.LGstat.ML2026-07-15

DAGR: State-Conditioned Goal Representations via Difference-Aware Goal Cross-Attention

Xing Lei, Wenyan Yang, Xuetao Zhang, Donglin Wang

Goal-conditioned reinforcement learning hinges on how the goal is encoded. Contrastive, metric, temporal-distance, and information-theoretic encoders differ in objective. They still share one trait. None of them sees the current state. Such a state-independent embedding cannot ma…

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arxivcs.LG2026-07-08

NFTR: From Provable Mode-Averaging to Geodesic Subgoal Selection in Offline Goal-Conditioned RL

Erdemt Bao, Xing Lei, Jun Chen

Hierarchical Implicit Q-Learning (HIQL), an offline goal-conditioned RL method, selects subgoals by value-function advantages alone. This rule has two coupled failure modes. Optimistic bias treats lucky stochastic outcomes as skillful choices, and mode collapse reduces a multi-mo…

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