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Learning Theory学习理论:近似值理论

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Learning Theory学习理论:近似值理论

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作 者:FelipeCucker,DingXuanZhou 著

出 版 社:

出版时间:2007-5-1

I S B N:9780521865593

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内容简介

The goal of learning theory is to approximate a function from sample values. To attain this goal learning theory draws on a variety of diverse subjects, specifically statistics, approximation theory, and algorithmics. Ideas from all these areas blended to form a subject whose many successful applications have triggered a rapid growth during the last two decades. This is the first book to give a general overview of the theoretical foundations of the subject emphasizing the approximation theory, while still giving a balanced overview. It is based on courses taught by the authors, and is reasonably self-contained so will appeal to a broad spectrum of researchers in learning theory and adjacent fields. It will also serve as an introduction for graduate students and others entering the field, who wish to see how the problems raised in learning theory relate to other disciplines.
  作者简介:
  Felipe Cucker is a Professor of Mathematics at the City University of Hong Kong.
  Ding Xuan Zhou is an Associate Professor in the Department of Mathematics at the City University of Hong Kong.

作者简介

目录

1 The framework of learning
 1.1 Introduction
 1.2 A formal setting
 1.3 Hypothesis spaces and target functions
 1.4 Sample, approximation, and generalization errors
 1.5 The bias-variance problem
 1.6 The remainder of this book
 1.7 References and additional remarks
2 Basic hypothesis spaces
 2.1 First examples of hypothesis space
 2.2 Reminders I
 2.3 Hypothesis spaces associated with Sobolev spaces
 2.4 Reproducing Kernel Hilbert Spaces
 2.5 Some Mercer kernels
 2.6 Hypothesis spaces associated with an RKHS
 2.7 Reminders II
 2.8 On the computation of empirical target functions
 2.9 References and additional remarks
3 Estimating the sample error
 3.1 Exponential inequalities in probability
 3.2 Uniform estimates on the defect
 3.3 Estimating the sample error
 3.4 Convex hypothesis spaces
 3.5 References and additional remarks
4 Polynomial decay of the approximation error
 4.1 Reminders IlI
 4.2 Operators defined by a kernel
 4.3 Mercer's theorem
 4.4 RKHSs revisited
 4.5 Characterizing the approximation error in RKHSs
 4.6 An example
 4.7 References and additional remarks
5 Estimating covering numbers
 5.1 Reminders IV
 5.2 Covering numbers for Sobolev smooth kernels
 5.3 Covering numbers for analytic kernels
 5.4 Lower bounds tbr covering numbers
 5.5 On the smoothness of box spline kernels
 5.6 References and additional remarks
6 Logarithmic decay of the approximation error
 6.1 Polynomial decay of the approximation error for kernels
 6.2 Measuring the regularity of the kernel
 6.3 Estimating the approximation error in RKHSs
 6.4 Proof of Theorem 6.1
 6.5 References and additional remarks
7 On the bias-variance problem
 7.1 A useful lemma
 7.2 Proof of Theorem 7.1
 7.3 A concrete example of bias-variance
 7.4 References and additional remarks
8 Least squares regularization
 8.1 Bounds for the regularized error
 8.2 On the existence of target functions
 8.3 A first estimate for the excess generalization error
 8.4 Proof of Theorem 8.1
 8.5 Reminders V
 8.6 Compactness and regularization
 8.7 References and additional remarks
9 Support vector machines for classification
 9.1 Binary classifiers
 ……
10 General regularized classifiers
References
Index

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