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Approximating Simple ReLU Networks based on Spectral Decomposition of Fisher Information
Ka Long Keith Ho, Yoshinari Takeishi, Junichi Takeuchi · 2025-05-23 · via cs.LG updates on arXiv.org

Properties of Fisher information matrices of 2-layer neural ReLU networks with random hidden weights are studied. For these networks, it is known that the eigenvalue distribution highly concentrates on several eigenspaces approximately. In particular, the eigenvalues for the first three eigenspaces account for 97.7% of the trace of the Fisher information matrix, independently of the number of parameters. In this paper, we identify the function spaces which correspond to those major eigenspaces. This function space consists of the spherical harmonic functions whose orders are not greater than 2. This result relates to the Mercer decomposition of the neural tangent kernels.

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