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Jonah Ellison, Mateo Ruiz, Owen Pell, Tomas Duncun, Hanae Fujita, Ingrid Solberg, Caleb Nguyen

Public reference bibliography and cataloged PDF materials authored or published by Jonah Ellison, Mateo Ruiz, Owen Pell, Tomas Duncun, Hanae Fujita, Ingrid Solberg, Caleb Nguyen.

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Where Groups Split: A Probe Prior for Nonzero Within-Group Variance in RL Post-Training

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

Group relative policy optimization learns from a prompt only when the rewards in the sampled group disagree. With a binary verifier, a group that is entirely correct or entirely incorrect has within-group variance zero a...