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Five years ago, researchers made a sudden leap in the accuracy of software that can interpret images. The technology behind it, artificial neural networks, underpins the recent boom in artificial intelligence (see "10 Breakthrough Technologies 2013: Deep Learning"). It is why Google and Facebook now let you search inside your photos, and it has unlocked new applications for facial recognition. Yann LeCun, director of Facebook's AI research group and a professor at New York University, helped pioneer the use of neural networks for machine vision. He says there's still progress to be made--and that it could lead to software with common sense.