2020

On the asymptotics of wide networks with polynomial activations

Aitken, Kyle, Gur-Ari, Guy

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We consider an existing conjecture addressing the asymptotic behavior of neural networks in the large width limit.

  • The results that follow from this conjecture include tight bounds on the behavior of wide networks during stochastic gradient descent, and a derivation of their finite-width dynamics.
  • We prove the conjecture for deep networks with polynomial activation functions, greatly extending the validity of these results.
  • Finally, we point out a difference in the asymptotic behavior of networks with analytic (and non-linear) activation functions and those with piecewise-linear activations such as ReLU.

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