# Yuchen Jin recalls hand-writing an image model inference engine a year ago

> Original title: Crazy convo with a friend today:

- Source: Yuchen Jin
- Published: 2026-10-29T04:02:19.000Z
- Bad Influence: https://badinfluence.news/items/fdsxgaf8iao3dnvqhsjgzh651
- Original: https://x.com/Yuchenj_UW/status/2115655442508788194

## Summary

Yuchen Jin says that after a conversation with a friend, he realized they wrote an inference engine for image models entirely by hand just one year ago. He calls the speed of AI progress since then striking.

## Post

Crazy convo with a friend today:

“Remember that super fast inference engine we built for image models?”

“Yeah, a year ago.”

“Dude, we wrote the WHOLE thing by hand.”

Holy shit. Just ONE year ago.