Author

Min-Da Zhao

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Preprint Sep 2026

Benign Nonconvex Landscape for Policy Optimization: Infinite-Horizon Discounted MDPs with General State and Action Spaces

We study the optimization landscape for infinite-horizon discounted Markov decision processes (MDPs) with general state and action spaces under structured stationary policy classes. A general weighted policy-iteration approach to establishing global convergence guarantees for policy gradient methods requires closure un...

Xin Chen, Min-Da Zhao · 0 citations

#artificial intelligence Preprint Sep 2026

Representation-guided in-context learning for medical image interpretation with multimodal large language models

Medical image interpretation is central to diagnosis and care, yet adapting general-purpose multimodal large language models (MLLMs) often requires resource-intensive domain-specific fine-tuning. Here we introduce representation-guided in-context learning (RG-ICL), a training-free inference framework that retrieves que...

Min-Da Zhao, Fang-Yu Hu, Yan Luo et al. · 0 citations

Preprint Aug 2026

Rare Diseases, Common Dilemmas: LLMs Prioritize Equal Resource Distribution over Patient Benefit in Decision-Making

This work presents a benchmark of 208 clinically grounded rare disease vignettes and identifies a strong authority-framing effect: models favor justice in committee-based contexts and shift toward beneficence and autonomy only when final decisions are framed as being made by clinicians or patients respectively.

Min-Da Zhao, Xuheng Han, R. Goel et al. · 0 citations