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    $\begingroup$ Source(s) please. – Reviewer $\endgroup$ Commented May 28, 2018 at 8:05
  • $\begingroup$ I would like that too. I think the >2 category referes to deep neural networks (or deep learning). $\endgroup$ Commented Dec 20, 2020 at 4:01
  • $\begingroup$ I found this here: heatonresearch.com/2017/06/01/hidden-layers.html Though it's not sourced well either. $\endgroup$ Commented Oct 2, 2021 at 23:35
  • $\begingroup$ For those whose looking for sources, the references that are mentioned in heatonresearch.com/2017/06/01/hidden-layers.html from the comment above are Cybenko, G. (1989) “Approximations by superpositions of sigmoidal functions”, Mathematics of Control, Signals, and Systems, 2 (4), 303-314, Kurt Hornik (1991) “Approximation Capabilities of Multilayer Feedforward Networks”, Neural Networks, 4(2), 251–257. doi:10.1016/0893-6080(91)90009-T Hinton, G. E.; Osindero, S.; Teh, Y. W. (2006). “A Fast Learning Algorithm for Deep Belief Nets” (PDF). Neural Computation. 18 (7): 1527–1554. $\endgroup$ Commented Mar 13 at 5:51