Minimax rates for learning spectral Barron functions by deep ReLU neural networks
It is shown that d-dimensional spectral Barron functions with smoothness index $s>0$ can be approximated by deep ReLU neural networks with approximation rate $\widetilde{\mathcal{O}} (S^{-\frac{1}{2}-\frac{s}{d}})$, and it is proved that this convergence rate is minimax optimal up to logarithmic factors.