Writing
Writing by Janghoon Lee.
5 Aug 2026
- inference
- on-device
- evaluation
- grammar
Failure Notes: How to Run an LLM on a User Laptop
Users refuse to send documents out, so we ran the model on their own machines, and one document evaluation took 23 minutes on an office laptop. With no GPU, growing the model and shrinking it are both blocked, so we went with a small model, removed JSON, and enforced format with a grammar. Implementing that, we got stuck six times and the cause was our code every time. What raised processing speed by 10x was one option that fetched a full probability distribution every token and then threw it away.
30 Jul 2026
- strategy
- inference
- evaluation
- on-device
Finding the Problems Where Capital Doesn't Decide
My founder friend said our Indic LLM story sounded two years old next to physical AI. The useful work was not chasing a fashionable comparable. It was killing wrong prescriptions until the only remaining space was hardware-constrained inference, evaluation that spends test once, and products that compound from owned usage.
1 Jan 2026
- advice
- entrepreneurship
- startup
Don't Start a Business
New Year brought a wave of questions about whether to found something. I am only nine years in. I do not have much to offer except this: do not. The numbers say stop. The contradiction is that I would start again for the co-founders I had.
1 Nov 2025
- claude
- skills
- one-pager
- communication
Pascal: no time to make it shorter
AI made long drafts cheap and noisy while reading time stayed fixed. Use models to think and explore, then force every thread into one page colleagues can finish without hunting for the point. The Claude skills linked here enforce that cut.
5 May 2020
- vision
- matrix
- digital twin
Matrix OS: a twin that does not die
Soul OS, Matrix OS, and Matrix as a Service: from The Matrix to environments where digital twins interact. The aim is a persistent replica that stores experience in real time, a society those Souls inhabit, and shared rooms for safety and system-dynamics research.
1 Mar 2018
- vision
- manifesto
- education
Manifesto: freeing others as I was freed
Why I will pursue wealth and influence: to fund a school, a hospital, and orphanages. Capital and authority are instruments; the purpose is to free others from avoidable hardship the way education freed me, then sustain those institutions so the obligation outlasts any one company.