Compositional Approximation Can Strictly Outperform Superpositional Approximation
Many classically studied function classes are known to be approximated optimally by superpositional methods, i.e. with approximants constructed as the linear combination of elements in some dictionary. Here optimality means that the uniform approximation error viewed as a function of the number of parameters used has polynomial decay of the highest order achievable by any parametrized method whose parameters can be encoded as a bit string of length proportional, up to logarithmic factors, to the number of parameters. While compositional methods like neural networks are structurally different, their approximation rates can be made comparable by imposing constraints that ensure such a propo...
| Authors | Dennis Elbrächter, Philipp Petersen |
|---|---|
| Primary category | math.NA |
| Published | 7 June 2026 |
| Last updated at source | 7 June 2026 |
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