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Cheng Gui, Yihua Shao, Lei Li, Jingcai Guo, Maolin Wang

Public reference bibliography and cataloged PDF materials authored or published by Cheng Gui, Yihua Shao, Lei Li, Jingcai Guo, Maolin Wang.

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Whether or Where? Tail Calibration Signals Finite-Budget Reward Hacking in Best-of-N Selection

Year: 2026 • Source: arxiv.org • Listed PDF

Best-of-N (BoN) inference returns the candidate with the highest proxy reward, so a larger $N$ tests the proxy's extreme tail more than its average ranking quality. We show that the exact BoN value is a Beta-weighted int...