Non-Gaussian Tensor ProgramsDownload PDF

Published: 31 Oct 2022, 18:00, Last Modified: 14 Jan 2023, 11:17NeurIPS 2022 AcceptReaders: Everyone
Keywords: deep learning theory, infinitely wide networks, tensor programs
TL;DR: We have extended the Tensor Programs framework to non-Gaussian weight distributions and recovered all existing applications of its main theorem
Abstract: Does it matter whether one randomly initializes a neural network (NN) from Gaussian, uniform, or other distributions? We show the answer is ”yes” in some parameter tensors (the so-called matrix-like parameters) but ”no” in others when the NN is wide. This is a specific instance of a more general universality principle for Tensor Programs (TP) that informs precisely when the limit of a program depends on the distribution of its initial matrices and vectors. To obtain this principle, we develop the theory of non-Gaussian Tensor Programs. As corollaries, we obtain all previous consequences of the TP framework (such as NNGP/NTK correspondence, Free Independence Principle, Dynamical Dichotomy Theorem, and μ-parametrization) for NNs with non-Gaussian weights.
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