Author

Hangqi Ren

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Preprint Aug 2026

Unmasking Toxic Mimicry in Medical Offline Reinforcement Learning for ICU Sepsis Management via Counterfactual Clinical Audits

Offline reinforcement learning (RL) offers considerable promise for optimizing ICU treatment decisions, yet standard evaluation metrics Mean Squared Error (MSE) and Fitted Q-Evaluation (FQE) assess only behavioral imitation and cannot detect Toxic Mimicry, a failure mode in which agents replicate harmful patterns such...

Hangqi Ren, Jun-Yi Liao · 0 citations

Preprint Aug 2026

Search Broadly, Seek Evidence on Both Sides, Decide Narrowly: Evidence-Admissible GraphRAG for Longitudinal Clinical Event Verification

Results show that separating broad evidence discovery from narrow evidence-admissible assessment improves longitudinal clinical verification and reduces unsupported conclusions.

Xin Lin, Yu-Bo Feng, Wei-Xin Liu et al. · 0 citations

Preprint Aug 2026

CRS-Bench: A Reference-Relative Reliability Benchmark for Medical Image Encoders

CRS-Bench provides a controlled framework for selecting medical image encoders from multi-axis reliability profiles rather than clean-test AUROC alone, and summarizes these dimensions using the Clinical Reliability Score (CRS), a Pareto-aware, reference-relative score combining dominance, profile balance, and worst-axi...

Xingtao Lin, Hangqi Ren, Caiwan Sun et al. · 0 citations