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New MinPRO objective stabilizes off-policy LLM reinforcement learning

Researchers have developed a new objective function called Minimum Prefix Ratio (MinPRO) to stabilize off-policy reinforcement learning for large language models (LLMs). Existing methods using token-level importance ratios struggle with training stability when there's a significant lag between the sampling and target policies. MinPRO addresses this by using a surrogate based on the minimum token-level ratio within a prefix, demonstrating improved stability and performance on mathematical reasoning benchmarks for both dense and mixture-of-experts LLMs. AI

IMPACT This research could lead to more stable and efficient training of LLMs for complex reasoning tasks.

RANK_REASON The cluster contains an academic paper detailing a new method for LLM optimization. [lever_c_demoted from research: ic=1 ai=1.0]

Read on arXiv cs.AI →

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New MinPRO objective stabilizes off-policy LLM reinforcement learning

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The cluster contains an academic paper detailing a new method for LLM optimization. [lever_c_demoted from research: ic=1 ai=1.0]
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COVERAGE [1]

  1. arXiv cs.AI TIER_1 English(EN) · Shiye Lei, Zhihao Cheng, Dacheng Tao ·

    Stabilizing Off-policy LLM Optimization with Prefix Importance Ratio

    arXiv:2601.22718v2 Announce Type: replace Abstract: Reinforcement learning (RL) post-training has increasingly demonstrated strong ability to elicit reasoning behaviors in large language models (LLMs). For training efficiency, rollouts are typically generated in an off-policy man…