Average case tractability of approximating $\infty$-variate functions
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- by G. W. Wasilkowski PDF
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Abstract:
We study function approximation in the average case setting for spaces of $\infty$-variate functions that have a weighted tensor product form and are endowed with a Gaussian measure that also has a weighted tensor product form. Moreover, we assume that the cost of function evaluation depends on the number of active variables and we allow it to be from linear to exponential. We provide a necessary and sufficient condition for the problem to be polynomially tractable and derive the exact value of the tractability exponent. In particular, the approximation problem is polynomially tractable under modest conditions on weights even if the function evaluation cost is exponential in the number of active variables. The problem is weakly tractable even if this cost is doubly exponential. These results hold for algorithms that can use unrestricted linear information. Similar results hold for weighted $L_2$ approximation, a special case of function approximation problems considered in this paper, and algorithms restricted to those that use only function samplings.References
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Additional Information
- G. W. Wasilkowski
- Affiliation: Department of Computer Science, University of Kentucky, Lexington, Kentucky 40506
- MR Author ID: 189251
- ORCID: 0000-0003-4727-7368
- Email: greg@cs.uky.edu
- Received by editor(s): March 1, 2012
- Received by editor(s) in revised form: September 10, 2012, and October 17, 2012
- Published electronically: August 1, 2013
- © Copyright 2013 American Mathematical Society
- Journal: Math. Comp. 83 (2014), 1319-1336
- MSC (2010): Primary 41A65, 47B06, 68Q17
- DOI: https://doi.org/10.1090/S0025-5718-2013-02759-7
- MathSciNet review: 3167460