With help from those forty thousand GPU chips and soon many more—a data center overhaul the company called Project Mack Truck—deep learning moved into everything from the Google Photos app, where it instantly found objects in a sea of images, to Gmail, where it helped predict the word you were about to type. It also greased the wheels inside Ad-Words, the online ad system that generated a vast majority of the company’s $56 billion in annual revenue.4 By analyzing data showing which ads people had clicked on in the past, deep learning could help predict what they would click on in the future.
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