Authors

Yujin Han

Publications 2

Preprint Open access

From Static to Dynamic: On-Policy Distillation from Image to Video Diffusion Models

Bingqing Jiang, Li Luo, Zichao Yu et al. · 2026

On-policy distillation (OPD) specializes pretrained video diffusion models through teacher supervision along the student's own generation trajectory. Although large video models are natural teachers, developing specialized video experts can require costly video data and training, while querying them incurs substantiall …

Preprint Open access

CoRe: Co-Evolving Reward Models for Mitigating Latent Reward Hacking in Video Diffusion Models

Zhaolong Su, Yujin Han, Feng Wang et al. · 2026

Latent reward models (LRMs) enable efficient alignment of video diffusion models by scoring intermediate states directly in latent space. However, we find that optimizing against a fixed latent reward rapidly leads to latent reward hacking: the predicted reward stays high while perceptual and motion quality deteriorate …

Co-authors

Zhaolong Su Feng Wang Jameson Dong Hins Hu Difan Zou Bingqing Jiang Li Luo Zichao Yu