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Researchers are calling into doubt the popular idea that deep-learning models are "black boxes" that reveal nothing about what goes on inside Load up the website This Person Does Not Exist and it'll show you a human face, near-perfect in its realism yet totally fake. Refresh and the neural network behind the site will generate another, and another, and another. The endless sequence of AI-crafted faces is produced by a generative adversarial network (GAN)--a type of AI that learns to produce realistic but fake examples of the data it is trained on. But such generated faces--which are starting to be used in CGI movies and ads--might not be as unique as they seem. In a paper titled This Person (Probably) Exists, researchers show that many faces produced by GANs bear a striking resemblance to actual people who appear in the training data.