Heck, they've been doing machine learning since at least 2004, when they added Latent Semantic Analysis for junk mail filtering to the Mail app. And does anybody remember iTunes Genius (collaborative filtering on your playlists in the cloud)?
I think Apple has traditionally done a really good job of keeping the technology used under wraps, for better or worse.
I think Apple has traditionally done a really good job of keeping the technology used under wraps, for better or worse.