Kangping Xu — accepted AI-conference papers

2026

Group Representational Position Encoding

Yifan Zhang, Zixiang Chen, Yifeng Liu, Zhen Qin, Huizhuo Yuan, Kangping Xu +3

ICLR 2026poster

We present GRAPE (Group RepresentAtional Position Encoding), a unified framework for positional encoding based on group actions. GRAPE brings together two families of mechanisms: (i) multiplicative rotations (Multiplicative GRAPE) in $\operatorname{SO}(d)$ and (ii) additive logit biases (Additive GR…

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2025

Beyond Bradley-Terry Models: A General Preference Model for Language Model Alignment

Yifan Zhang, Ge Zhang, Yue Wu, Kangping Xu, Quanquan Gu

ICML 2025poster

Modeling human preferences is crucial for aligning foundation models with human values. Traditional reward modeling methods, such as the Bradley-Terry (BT) reward model, fall short in expressiveness, particularly in addressing intransitive preferences. In this paper, we introduce \emph{preference em…

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