Publications

(* denotes equal contribution, † denotes corresponding author)

DVD-Quant teaser 

DVD-Quant: Data-free Video Diffusion Transformers Quantization
Zhiteng Li*, Hanxuan Li*, Junyi Wu, Kai Liu, Linghe Kong, Guihai Chen, Yulun Zhang, Xiaokang Yang
ICLR 2026
tl;dr: We develop the first data-free quantization framework that achieves W4A4 PTQ for Video DiTs with 2× speedup while maintaining visual fidelity.

Pion: A Spectrum-Preserving Optimizer via Orthogonal Equivalence Transformation
Kexuan Shi*, Hanxuan Li*, Zeju Qiu, Yandong Wen, Simon Buchholz, Weiyang Liu
arXiv preprint arXiv:2605.12492
tl;dr: A spectrum-preserving optimizer that updates each weight matrix via left and right orthogonal transformations, keeping singular values fixed while modulating geometry; competitive for LLM pretraining and finetuning.