Author

Zhenbo Yu

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Preprint Aug 2026

GCPO: Diagnosing and Constraining Subspace Geometry in Rollout RL for LLMs

On-policy rollout methods such as GRPO are central to post-training of large language models, yet they frequently suffer from training instabilities, cross-task capability degradation, and response-length inflation. Although prior work has characterized the subspace geometry of aggregate updates, the stepwise variation...

Kai Yang, Jingwei Xu, Wan-Yu Wang et al. · 0 citations

Sep 2026

Latent Textual Space: Pivot for Scaling Customized Text-to-Image and Video Generation.

Customized generation synthesizes user-specified visual concepts into novel contexts conditioned on prompts. Scaling the number of concepts in customized generation meets a broader demand for personalization, whereas existing methods face challenges with generation quality and computational efficiency. In this paper, w...

Jian Jin, Zhen-Bo Yu, Yang Shen et al. · IEEE Transactions on Pattern... · 0 citations