AI article
How LLMs are actually built — and why most "how it works" threads stop too early
Community description: A distilled map of the five components, the data pipeline, post-training and evaluation — every claim mapped to a timestamp in the source lecture.
Dev.to | Oct 17, 2026 | afa-lizhao001
Automated excerpt
A real pipeline looks like this: Crawl — Common Crawl: ~250B pages, ~1 PB. Heuristics — odd token distributions, strange word lengths, too short, too long. Mixed precision (store weights in 32-bit, compute in 16-bit, update in 32-bit) and operator fusion (torch. compile gets roughly 2× faster training by moving data through GPU memory once instead of per op).
Selected automatically from source text; not independently written or fact-checked. Read the original for full context.