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Zhiyuan Liu

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#artificial intelligence Preprint Sep 2026

Diffusion Reward Models

Reward models underpin the alignment of large language models, yet the dominant designs reduce each prompt--response pair to a point estimate or to a distribution from a fixed parametric family. This is at odds with human preference, which is inherently multimodal: the same response can be reasonably judged in many way...

Xiang-Yang Wang, Bing-Xiang He, Ze-Yuan Liu et al. · 0 citations
Jul 2026

SLPO: Scaling Latent Reasoning via a Surrogate Policy

Surrogate Latent Policy Optimization (SLPO) is introduced to bring outcome-reward RL to autoregressive latent reasoners: an empirical surrogate policy density over latent transitions for trajectory-level credit assignment, and a correctness-supervised stopping head that outcome-reward optimization refines into a variab...

Runyang You, Zhiyuan Liu, Yongqi Li et al. · 1 citation

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