A generative vision model that trains with high data efficiency and breaks text-based CAPTCHAs - George, Dileep; Lehrach, Wolfgang; Kansky, Ken; Lázaro-Gredilla, Miguel; Laan, Christopher; Marthi, Bhaskara; Lou, Xinghua; Meng, Zhaoshi; Liu, Yi; Wang, Huayan; Lavin, Alex; Phoenix, D Scott (Science (American Association for the Advancement of Science), 2017)