NAIS-Net: Stable Deep Networks from Non-Autonomous Differential Equations

Marco Ciccone; Marco Gallieri; Jonathan Masci; Christian Osendorfer; Faustino Gomez

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arXiv · 1804.07209

NAIS-Net: Stable Deep Networks from Non-Autonomous Differential Equations

Marco Ciccone·Marco Gallieri·Jonathan Masci·Christian Osendorfer·Faustino Gomez

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Abstract

This paper introduces Non-Autonomous Input-Output Stable Network(NAIS-Net), a very deep architecture where each stacked processing block is derived from a time-invariant non-autonomous dynamical system. Non-autonomy is implemented by skip connections from the block input to each of the unrolled processing stages and allows stability to be enforced so that blocks can be unrolled adaptively to a pattern-dependent processing depth. NAIS-Net induces non-trivial, Lipschitz input-output maps, even for an infinite unroll length. We prove that the network is globally asymptotically stable so that for every initial condition there is exactly one input-dependent equilibrium assuming $tanh$ units, and incrementally stable for ReL units. An efficient implementation that enforces the stability under derived conditions for both fully-connected and convolutional layers is also presented. Experimental results show how NAIS-Net exhibits stability in practice, yielding a significant reduction in generalization gap compared to ResNets.

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BibTeX RIS

Marco Ciccone, Marco Gallieri, Jonathan Masci, Christian Osendorfer, Faustino Gomez. 2018-04-19. NAIS-Net: Stable Deep Networks from Non-Autonomous Differential Equations. https://arxiv.org/abs/1804.07209

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