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| Format: | Preprint |
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2024
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| Online Access: | https://arxiv.org/abs/2412.17582 |
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| _version_ | 1866910759970144256 |
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| author | Reinhardt, Niklas Wang, Sven Zech, Jakob |
| author_facet | Reinhardt, Niklas Wang, Sven Zech, Jakob |
| contents | We present statistical convergence results for the learning of (possibly) non-linear mappings in infinite-dimensional spaces. Specifically, given a map $G_0:\mathcal X\to\mathcal Y$ between two separable Hilbert spaces, we analyze the problem of recovering $G_0$ from $n\in\mathbb N$ noisy input-output pairs $(x_i, y_i)_{i=1}^n$ with $y_i = G_0 (x_i)+\varepsilon_i$; here the $x_i\in\mathcal X$ represent randomly drawn 'design' points, and the $\varepsilon_i$ are assumed to be either i.i.d. white noise processes or subgaussian random variables in $\mathcal{Y}$. We provide general convergence results for least-squares-type empirical risk minimizers over compact regression classes $\mathbf G\subseteq L^\infty(X,Y)$, in terms of their approximation properties and metric entropy bounds, which are derived using empirical process techniques. This generalizes classical results from finite-dimensional nonparametric regression to an infinite-dimensional setting. As a concrete application, we study an encoder-decoder based neural operator architecture termed FrameNet. Assuming $G_0$ to be holomorphic, we prove algebraic (in the sample size $n$) convergence rates in this setting, thereby overcoming the curse of dimensionality. To illustrate the wide applicability, as a prototypical example we discuss the learning of the non-linear solution operator to a parametric elliptic partial differential equation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_17582 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Statistical Learning Theory for Neural Operators Reinhardt, Niklas Wang, Sven Zech, Jakob Statistics Theory Numerical Analysis 62G05 We present statistical convergence results for the learning of (possibly) non-linear mappings in infinite-dimensional spaces. Specifically, given a map $G_0:\mathcal X\to\mathcal Y$ between two separable Hilbert spaces, we analyze the problem of recovering $G_0$ from $n\in\mathbb N$ noisy input-output pairs $(x_i, y_i)_{i=1}^n$ with $y_i = G_0 (x_i)+\varepsilon_i$; here the $x_i\in\mathcal X$ represent randomly drawn 'design' points, and the $\varepsilon_i$ are assumed to be either i.i.d. white noise processes or subgaussian random variables in $\mathcal{Y}$. We provide general convergence results for least-squares-type empirical risk minimizers over compact regression classes $\mathbf G\subseteq L^\infty(X,Y)$, in terms of their approximation properties and metric entropy bounds, which are derived using empirical process techniques. This generalizes classical results from finite-dimensional nonparametric regression to an infinite-dimensional setting. As a concrete application, we study an encoder-decoder based neural operator architecture termed FrameNet. Assuming $G_0$ to be holomorphic, we prove algebraic (in the sample size $n$) convergence rates in this setting, thereby overcoming the curse of dimensionality. To illustrate the wide applicability, as a prototypical example we discuss the learning of the non-linear solution operator to a parametric elliptic partial differential equation. |
| title | Statistical Learning Theory for Neural Operators |
| topic | Statistics Theory Numerical Analysis 62G05 |
| url | https://arxiv.org/abs/2412.17582 |