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Yu-Heng Zhang

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#machine learning Preprint Oct 2026

Fast Last-Iterate Convergence in Zero-Sum Markov Games with Bandit Feedback

We study last-iterate convergence in unknown two-player zero-sum discounted Markov games with bandit feedback. The players learn independently along a single trajectory without observing each other's actions. We develop Adaptive Regularized TD Learning (ARTD), which achieves a $\widetilde{\mathcal{O}}(t^{-1/4})$ dualit...

Yu-Heng Zhang · 0 citations
#machine learning Preprint Sep 2026

Polylogarithmic Nash Regret in Matrix Games with Bandit Feedback

Optimistic Payoff Balancing (OPB), which achieves instance-dependent instance-dependent $\mathcal{O}(\log^2 T)$ Nash regret against arbitrary adaptive opponents, including games with nonunique equilibria, is developed.

Yu-Heng Zhang · 0 citations
#artificial intelligence Preprint Sep 2026

Coupled Calibration and Learning: Mitigating Teacher Bias in LLM Distillation without Target-Domain Reward Feedback

Coupled Calibration and Learning (CCL) is proposed, an LLM distillation algorithm that couples teacher calibration with student updates through token-level branching, using reward feedback only on source questions.

Hai-Chen Hu, Yu-Heng Zhang, David Simchi-Levi · 0 citations

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