Bi-NAC frames RL with textual feedback as a Stackelberg bilevel program and reports that 2B and 6B models trained this way outperform larger GRPO baselines on MATH-500 and GPQA.
From faithfulness to correctness: Generative reward models that think critically, 2025
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RL with Learnable Textual Feedback: A Bilevel Approach
Bi-NAC frames RL with textual feedback as a Stackelberg bilevel program and reports that 2B and 6B models trained this way outperform larger GRPO baselines on MATH-500 and GPQA.