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Zi-Jun Chen

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#machine learning Preprint Sep 2026

Optimal Multi-Reward Reinforcement Learning

We study an unknown-transition finite-horizon Markov decision process (MDP) with a finite collection of known reward functions $\{r^1, r^2, \ldots, r^M\}$. The goal is to output an $\epsilon$-optimal policy for every reward using online episodic interaction only. Performance is measured by the policy error $V_{0}^{*, m...

Zi-Jun Chen, Zi-Han Zhang · 0 citations
#machine learning Preprint Sep 2026

Distributionally Robust Average-Reward Reinforcement Learning: Finite-Sample Guarantees under Weak Communication

This work establishes explicit radius conditions under which the robust average-reward Bellman equation admits a constant-gain solution, while for total variation and Wasserstein balls, any positive radius suffices without requiring the nominal MDP to be weakly communicating.

Chen-Yu Lu, Zi-Jun Chen, Nian Si · 0 citations

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