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. 2017 Jul 14;12(7):e0180944. doi: 10.1371/journal.pone.0180944

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© 2017 Bao et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 2 — The model learns a hidden feature a(x) from input x by reconstructing it on x'. Here,W₁ and W₂ are the weight of t he hidden layer and the reconstruction layer, respectively. b₁ and b₂ are the bias of the hidden layer and the reconstruction layer, respectively.