Periodic Activation Functions Induce StationarityDownload PDF

21 May 2021, 20:50 (modified: 20 Dec 2021, 11:43)NeurIPS 2021 PosterReaders: Everyone
Keywords: Bayesian deep learning, Gaussian process, uncertainty quantification
TL;DR: Periodic activation functions induce a connection between the prior on the network weights and stationary Gaussian process priors.
Abstract: Neural network models are known to reinforce hidden data biases, making them unreliable and difficult to interpret. We seek to build models that `know what they do not know' by introducing inductive biases in the function space. We show that periodic activation functions in Bayesian neural networks establish a connection between the prior on the network weights and translation-invariant, stationary Gaussian process priors. Furthermore, we show that this link goes beyond sinusoidal (Fourier) activations by also covering triangular wave and periodic ReLU activation functions. In a series of experiments, we show that periodic activation functions obtain comparable performance for in-domain data and capture sensitivity to perturbed inputs in deep neural networks for out-of-domain detection.
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