## Universal approximations of permutation invariant/equivariant functions by deep neural networks

Sep 25, 2019 Blind Submission readers: everyone Show Bibtex
• Keywords: finite group, invariant, equivariant, neural networks
• TL;DR: For a given $G$-invariant/equivariant function, we construct its universal approximator by deep neural network whose layers equip $G$-actions and each affine transformations are $G$-equivariant/invariant.
• Abstract: In this paper, we develop a theory about the relationship between $G$-invariant/equivariant functions and deep neural networks for finite group $G$. Especially, for a given $G$-invariant/equivariant function, we construct its universal approximator by deep neural network whose layers equip $G$-actions and each affine transformations are $G$-equivariant/invariant. Due to representation theory, we can show that this approximator has exponentially fewer free parameters than usual models.
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