About me

Hi! I’m a CS Ph.D. student at CMU advised by Zico Kolter. Previously, I was a research assistant at Peking University, advised by Zhouchen Lin. I also had a wonderful summer at Meta Reality Labs with Shaojie Bai working on generative avatar encoding.

I am an enthusiast of dynamics, recognizing, understanding, and developing dynamics that self-organize complex systems.

Research

I have eclectic interests in machine learning and deep learning, especially when combined with dynamics. I believe that structured decomposition (perception) and reconstruction (generation) are key to understanding the emergence of general intelligence, which dynamics can elegantly achieve.

• Regarding the “forward” pass, I study dynamical systems (fixed point equations, optimization, differential equations, etc) as the construction method and learning principle in neural networks.
• Regarding the “backward” pass, I pursue a better understanding of neural network training dynamics. I am fascinated by their landscape. A strong belief drives me to investigate the interaction between data/env, model, and learning dynamics.

I am also interested in modeling and understanding nature through dynamics. The only constant is change. The invariance under change is truth. :D

Twitter

There is no need to anneal down life's "learning rate" too early. Even today, I often feel I should "restart" to extricate myself from too many AI papers📝or bubbles🫧.

AGI should offer people better childhood and teenage lives, not grasping people to serve and achieve itself.… https://t.co/JCrRfL3boU

— Zhengyang Geng (@ZhengyangGeng) April 12, 2024

Projects

• Consistency Models Made Easy
  Zhengyang Geng, William Luo, Ashwini Pokle, and J. Zico Kolter
  TL;DR: Easy Consistency Tuning through Self Teacher :D
  [Blog] [Code] [BibTex]

• 

  TorchDEQ: A Library for Deep Equilibrium Models

  Zhengyang Geng, and J. Zico Kolter

  TL;DR: Modern Fixed Point Systems using Pytorch.
  [Report] [Code] [Colab Tutorial] [Doc] [DEQ Zoo]

• 1-Step Diffusion Distillation via Deep Equilibrium Models
  In Neural Information Processing Systems (NeurIPS) 2023
  Zhengyang Geng*, Ashwini Pokle*, and J. Zico Kolter
  TL;DR: Generative Equilibrium Transformer (GET) as strong 1-step diffusion learner.
  [Paper] [Code] [BibTex]

• 

  Medusa: Simple Framework for Accelerating LLM Generation with Multiple Decoding Heads

  Tianle Cai*, Yuhong Li*, Zhengyang Geng, Hongwu Peng, Tri Dao

  TL;DR: Simple LLM acceleration with multiple decoding heads and self-verification.
  [Report] [Blog] [Code]

• Equilibrium Image Denoising With Implicit Differentiation
  In IEEE Transactions on Image Processing
  Qi Chen, Yifei Wang, Zhengyang Geng, Yisen Wang, Jiansheng Yang, and Zhouchen Lin
  TL;DR: Equilibrium image denoising with implicit differentiation.
  [Paper] [BibTex]

• Deep Equilibrium Approaches To Diffusion Models
  In Neural Information Processing Systems (NeurIPS) 2022
  Ashwini Pokle, Zhengyang Geng, and J. Zico Kolter
  TL;DR: Parallel diffusion decoding via fixed point equations.
  [Paper] [Code] [BibTex]

• Eliminating Gradient Conflict in Reference-based Line-art Colorization
  Zekun Li, Zhengyang Geng, Zhao Kang, Wenyu Chen, Yibo Yang
  In Proceedings of European Conference on Computer Vision (ECCV) 2022
  TL;DR: Investigating and alleviating gradient conflicts in attention training.
  [Paper] [Code] [BibTex]

• Deep Equilibrium Optical Flow Estimation
  Shaojie Bai*, Zhengyang Geng*, Yash Savani, J. Zico Kolter (*equal contribution)
  In Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition (CVPR) 2022
  TL;DR: Equilibrium solving as flow estimation. SoTA zero-shot generalization.
  
  [Paper] [Code] [BibTex]

• On Training Implicit Models
  Zhengyang Geng*, Xin-Yu Zhang*, Shaojie Bai, Yisen Wang, Zhouchen Lin (*equal contribution)
  In Neural Information Processing Systems (NeurIPS) 2021
  TL;DR: Cheap, fast, and stable inexact gradient works as well as implicit differentiation.
  [Paper] [Slides] [Poster] [Code] [BibTex]

• Residual Relaxation for Multi-view Representation Learning
  Yifei Wang, Zhengyang Geng, Feng Jiang, Chuming Li, Yisen Wang, Jiansheng Yang, Zhouchen Lin.
  In Neural Information Processing Systems (NeurIPS) 2021
  TL;DR: Equivariant contrastive learning replaces invariant contrastive learning.
  [Paper] [Slides] [BibTex]

• Is Attention Better Than Matrix Decomposition?
  Zhengyang Geng*, Meng-Hao Guo*, Hongxu Chen, Xia Li, Ke Wei, Zhouchen Lin. (*equal contribution)
  In International Conference on Learning Representations (ICLR) 2021, top 3%.
  TL;DR: Optimization (matrix decomposition) as attention.
  [PDPaperF] [Code] [Blog Series 1 (zh), 2 (zh), 3 (zh)] [Poster] [BibTex]