Jiachen's Home Page

Hi, I'm Jiachen Lei 👋

I hold an M.S. degree from Cyberspace Security Lab at Zhejiang University. During my time there, I had the privilege of being mentored by Professor Zhongjie Ba. My academic journey has been enriched by diverse experiences, including an internship at Microsoft Research under the expert guidance of Shuang Ma, as well as an internship in Professor Anima Anandkumar's group, where I had the privilege of receiving valuable support from Professor Anima Anandkumar, Julius Berner and Professor Chaowei Xiao.

Beijing, China
Last updated on Nov 2, 2025
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This is me at ICCV2023

Feel free to drop me an email if you would like to cooporate. Contact: jiachenlei at zju.edu.cn or jiachenleiii at gmail.com

Publications

There is No VAE: End-to-End Pixel-Space Generative Modeling via Self-Supervised Pre-training

Jiachen Lei, Keli Liu, Julius Berner, Haiming Yu, Hongkai Zheng, Jiahong Wu, Xiangxiang Chu

Robust Representation Consistency Model via Contrastive Denoising

Jiachen Lei, Julius Berner, Jiongxiao Wang, Zhongzhu Chen, Chaowei Xiao, Zhongjie Ba, Kui Ren, Jun Zhu, Anima Anandkumar

Consistency Purification: Effective and Efficient Diffusion Purification towards Certified Robustness

Yiquan Li*, Zhongzhu Chen*, Kun Jin*, Jiongxiao Wang*, Jiachen Lei, Bo Li, Chaowei Xiao
* : first author, equal contribution

Masked Diffusion Models are Fast Distribution Learners

Jiachen Lei, Qinglong Wang, Peng Cheng, Zhongjie Ba*, Zhan Qin, Zhibo Wang, Zhenguang Liu, Kui Ren

SurrogatePrompt: Bypassing the Safety Filter of Text-To-Image Models via Substitution

Zhongjie Ba, Jieming Zhong, Jiachen Lei, Peng Cheng, Kui Ren

Experience

Zhejiang University

Sep 2020 - Mar 2023, Master, Artificial Intelligence

Shanghai Unversity of Electric Power

Sep 2016 - June 2020, Undergraduate, Electrical Engineering