Chia-Chiunn Ho was eating lunch inside Facebook headquarters, at the Full Circle Cafe, when he saw the notice on his phone: Larry Zitnick, one of the leading figures at the Facebook Artificial Intelligence Research lab, was teaching another class on deep learning. Ho is a 34-year-old Facebook digital graphics engineer known to everyone as “Solti,” after his favorite conductor. He couldn’t see a way of signing up for the class right there in the app.

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