Title
Understanding Priors in Bayesian Neural Networks at the Unit Level
Abstract
We investigate deep Bayesian neural networks with Gaussian weight priors and a class of ReLU-like nonlinearities. Bayesian neural networks with Gaussian priors are well known to induce an L2, "weight decay", regularization. Our results characterize a more intricate regularization effect at the level of the unit activations. Our main result establishes that the induced prior distribution on the units before and after activation becomes increasingly heavy-tailed with the depth of the layer. We show that first layer units are Gaussian, second layer units are sub-exponential, and units in deeper layers are characterized by sub-Weibull distributions. Our results provide new theoretical insight on deep Bayesian neural networks, which we corroborate with simulation experiments.
Year
Venue
Field
2019
international conference on machine learning
Pattern recognition,Computer science,Weight decay,Gaussian,Regularization (mathematics),Bayesian neural networks,Artificial intelligence,Prior probability
DocType
Citations 
PageRank 
Conference
0
0.34
References 
Authors
0
4
Name
Order
Citations
PageRank
Mariia Vladimirova101.01
J. J. Verbeek23944181.44
Pablo Mesejo322.44
Julyan Arbel433.12