1-2 of about 2 matches for site:sai-bi.github.io webpage
https://sai-bi.github.io/project/sig21_avatar/index.html
Sai's personal webpage SIGGRAPH 2021 Deep Relightable Appearance Models for Animatable Faces Sai Bi 1 Stephen Lombardi
https://sai-bi.github.io/project/siggraph2015/index.html
Sai's personal webpage SIGGRAPH 2015 An L1 Image Transform for Edge-Preserving Smoothing and Scene