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Re:AI is transforming Google search – the rest of the web is... by Houshalter on Saturday February 06, 2016 @03:49PM (#11049773)
I believe that has to do with the vanishing gradient issue which has been studied.

As for why nets converge at all, there's this paper whichI believe tries to establish some theory why bigger nets don't have such a big problem with local optima: http://arxiv.org/abs/1412.0233

Re:AI is transforming Google search – the rest of the web is... by nl on Sunday February 07, 2016 @04:37AM (#11052318)
Yes, exactly! Trying to understand why this happens is a very active area of research.