Disclosure: I'm the founder of Face2social , a face-recognition search engine. This post is about the vector-search engineering behind it — no product pitch, just the stuff that kept me up at night (including the part where I tell you what we're bad at). It's also the write-up I wish I'd found ...
Source: [Dev.to](https://dev.to/david_anderson_464f83434c/how-we-search-a-face-across-1-billion-photos-in-under-a-second-with-faiss-2lm)