arXiv (OAI Expanded)
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ThinkPrior: Zero-Rollout Difficulty Priors for Cold-Start Prompt Selection in RLVR
In reinforcement learning with verifiable rewards (RLVR) trained with group relative policy optimization (GRPO), the KL-free reward-advantage term studied here depends on within-group reward variation. If all rollouts in a group are correct or all are wrong, their group-relative advantages are ident
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