For cubic SKI the inducing-point count should grow as n^{d/3}; the advertised linear-time regime d≤3 is incorrect because at d=3 the paper's own inequality forces error to grow with n.
Sharp analysis of low-rank kernel matrix approximations
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The Price of Linear Time: Error Analysis of Structured Kernel Interpolation
For cubic SKI the inducing-point count should grow as n^{d/3}; the advertised linear-time regime d≤3 is incorrect because at d=3 the paper's own inequality forces error to grow with n.