https://www.theverge.com/2017/10/11/16459646/pornhub-machine-learning-ai-video-tagging

Artificial intelligence has proven to be a dab hand at recognizing what’s going on in photos and videos, but the datasets it’s usually trained on are pretty genteel. Not so for Pornhub, which announced today that it’s using machine learning to automatically catalog its videos.

The site is starting small, deploying facial recognition software that will detect 10,000 individual porn stars and tag them in footage. (Usually this information is provided by uploaders and viewers, who will still play a part by verifying the software’s choices.) It plans to scan all 5 million of its videos “within the next year,” and then move onto more complicated territory: using the software to identify the specific categories videos belong to, like “public” and “blonde.”