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cs.CV2026
Evaluating the Diagnostic Robustness of Vision-Language Models Under Visual and Textual Perturbations
Ali Khoramfar, Mohammad Javad Dousti, Alireza Mohamadian +1
Standard accuracy metrics for VLMs often mask significant reliability failures in sensitive domains. In this work, we utilize a histopathology-validated brain MRI dataset to system…
cs.LG2026
MDP-GRPO: Stabilized Group Relative Policy Optimization for Multi-Constraint Instruction Following
Mohammad Mahdi Salmani-Zarchi, Zahra Rahimi, Heshaam Faili +1
Reinforcement learning with verifiable rewards is ideal for multi-constraint instruction following, yet standard group-relative policy optimization (GRPO) becomes unstable under di…