Jiarui (Jerry) Xu
Still Learning Machines
jiarui.c.xu@gmail.com
Writings
My Bitter Lessons
January 7, 2026
Product Lessons I Learned from Teaching People Zoom
November 15, 2020
Active Projects
Products
Cyber FM
AI-powered radio station *
Overfitting.ai
Agentic Systems for ML *
NewGrad.ai
AI-powered career tools for new grads *
GBDT Research
JAXBoost
JAX autodiff for XGBoost/LightGBM objectives
Awesome GBDT
Curated list of GBDT resources
OpenBoost
GPU-native, all-Python platform for tree-based ML *
Transformer Research
microTabPFN
Minimal TabPFN in ~210 lines for education
Micro RL
Reinforcement learning agents for Codenames *
Education
AIpedia.org
AI encyclopedia and learning resource
transformer101.com
Learn transformer architecture from scratch *
agentology.org
Anthropology for Agents *
Community
OpenRegulations.ai
AI analysis for regulations.gov
* in active development. coming soon in Q1 2026
Select In-Active Projects
East Bay FeedER
— Fed frontline hospital staff & supported local restaurants
Mission Bit
— CS education for underserved youth in SF
Code Nation
— Tech education for under-resourced high schoolers