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Re:Jeff Dean’s Lecture for YC AI [video] by cosminro on Monday August 07, 2017 @05:46PM (#14951538)
He is referring to this paper https://research.googleblog.com/2017/06/multimodel-multi-tas...

Where they used one model to do image recognition, speech recognition and translation in the same network.

Re:Jeff Dean’s Lecture for YC AI [video] by shpx on Thursday August 10, 2017 @05:18AM (#14977916)
He also mentions sparsely activating only the neurons that matter, which they explore in https://arxiv.org/pdf/1701.06538.pdf

Personally I didn't find it very satisfying, I imagine something more fundamental and self referential.