For the scalar-input four-layer ReLU example, the plain NTK is not shift-invariant and lacks a strong diagonal, whereas the basic Fourier mapping yields a stationary kernel. · CiteArk
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For the scalar-input four-layer ReLU example, the plain NTK is not shift-invariant and lacks a strong diagonal, whereas the basic Fourier mapping yields a stationary kernel.
Source: paper:Figure 2(a,b), physical p. 5; §4 pp. 4–5
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