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About this paper
Haifeng Qian, David Mosallanezhad, Christian Munley, Adithya Renduchintala, Oleksii Kuchaiev
Double-rollout estimates partial-trace reliability by sampling continuations and revising rewards with their mean correctness, rather than final answers alone. On hard DAPO math prompts, continuations from short, originally correct traces averaged as low as 74% correct. On DAPO-trained Nemotron-3-Nano-30B-A3B, AIME 2026 accuracy was 95.4%, versus 91.5% with GRPO; this selected-checkpoint comparison does not establish gains across all scores or token budgets.
Key insights
- A rollout’s observed correctness can disagree with how reliably its partial reasoning leads to correct answers across sampled continuations; these mismatches are more pronounced for shorter traces.
- The truncation point and number of continuations matter: retaining 50–90% of a trace can be useful, whereas 99% is less consistent, and more samples do not guarantee better results beyond eight.
Summary by alphaXiv.
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