O'Reilly was standing a few feet from Google CEO and co-founder Larry Page this past May, at a small cocktail reception for the press at the annual Google I/O conference—the centerpiece of the company's year. Google had unveiled its personal photos app earlier in the day, and O'Reilly marveled that if he typed something like "gravestone" into the search box, the app could find a photo of his uncle's grave, taken so long ago.

The app uses an increasingly powerful form of artificial intelligence called deep learning. By analyzing thousands of photos of gravestones, this AI technology can learn to identify a gravestone it has never seen before. The same goes for cats and dogs, trees and clouds, flowers and food.

The Google Photos search engine isn't perfect. But its accuracy is enormously impressive—so impressive that O'Reilly couldn't understand why Google didn't sell access to its AI engine via the Internet, cloud-computing style, letting others drive their apps with the same machine learning.