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AI was overhyped in the 1950s with the perceptron. Machine learning advances in fits and starts. As soon as it looks like it’s out of steam something novel comes out. Circa 2010 all the effort was on perfecting SVMs to the point where 1% point improvement on a computer vision task was a PhD thesis and the like then all of a sudden AlexNet made neural nets look feasible and the game changed overnight.