Results 1  10
of
29
The Nature of Statistical Learning Theory
, 1995
"... Abstract—Statistical learning theory was introduced in the late 1960’s. Until the 1990’s it was a purely theoretical analysis of the problem of function estimation from a given collection of data. In the middle of the 1990’s new types of learning algorithms (called support vector machines) based on ..."
Abstract

Cited by 9946 (28 self)
 Add to MetaCart
Abstract—Statistical learning theory was introduced in the late 1960’s. Until the 1990’s it was a purely theoretical analysis of the problem of function estimation from a given collection of data. In the middle of the 1990’s new types of learning algorithms (called support vector machines) based on the developed theory were proposed. This made statistical learning theory not only a tool for the theoretical analysis but also a tool for creating practical algorithms for estimating multidimensional functions. This article presents a very general overview of statistical learning theory including both theoretical and algorithmic aspects of the theory. The goal of this overview is to demonstrate how the abstract learning theory established conditions for generalization which are more general than those discussed in classical statistical paradigms and how the understanding of these conditions inspired new algorithmic approaches to function estimation problems.
A tutorial on support vector machines for pattern recognition
 Data Mining and Knowledge Discovery
, 1998
"... The tutorial starts with an overview of the concepts of VC dimension and structural risk minimization. We then describe linear Support Vector Machines (SVMs) for separable and nonseparable data, working through a nontrivial example in detail. We describe a mechanical analogy, and discuss when SV ..."
Abstract

Cited by 2497 (11 self)
 Add to MetaCart
(Show Context)
The tutorial starts with an overview of the concepts of VC dimension and structural risk minimization. We then describe linear Support Vector Machines (SVMs) for separable and nonseparable data, working through a nontrivial example in detail. We describe a mechanical analogy, and discuss when SVM solutions are unique and when they are global. We describe how support vector training can be practically implemented, and discuss in detail the kernel mapping technique which is used to construct SVM solutions which are nonlinear in the data. We show how Support Vector machines can have very large (even infinite) VC dimension by computing the VC dimension for homogeneous polynomial and Gaussian radial basis function kernels. While very high VC dimension would normally bode ill for generalization performance, and while at present there exists no theory which shows that good generalization performance is guaranteed for SVMs, there are several arguments which support the observed high accuracy of SVMs, which we review. Results of some experiments which were inspired by these arguments are also presented. We give numerous examples and proofs of most of the key theorems. There is new material, and I hope that the reader will find that even old material is cast in a fresh light.
An introduction to kernelbased learning algorithms
 IEEE TRANSACTIONS ON NEURAL NETWORKS
, 2001
"... This paper provides an introduction to support vector machines (SVMs), kernel Fisher discriminant analysis, and ..."
Abstract

Cited by 422 (49 self)
 Add to MetaCart
This paper provides an introduction to support vector machines (SVMs), kernel Fisher discriminant analysis, and
Some PACBayesian Theorems
 Machine Learning
, 1998
"... This paper gives PAC guarantees for "Bayesian" algorithms  algorithms that optimize risk minimization expressions involving a prior probability and a likelihood for the training data. PACBayesian algorithms are motivated by a desire to provide an informative prior encoding informat ..."
Abstract

Cited by 108 (4 self)
 Add to MetaCart
(Show Context)
This paper gives PAC guarantees for "Bayesian" algorithms  algorithms that optimize risk minimization expressions involving a prior probability and a likelihood for the training data. PACBayesian algorithms are motivated by a desire to provide an informative prior encoding information about the expected experimental setting but still having PAC performance guarantees over all IID settings. The PACBayesian theorems given here apply to an arbitrary prior measure on an arbitrary concept space. These theorems provide an alternative to the use of VC dimension in proving PAC bounds for parameterized concepts. 1 INTRODUCTION Much of modern learning theory can be divided into two seemingly separate areas  Bayesian inference and PAC learning. Both areas study learning algorithms which take as input training data and produce as output a concept or model which can then be tested on test data. In both areas learning algorithms are associated with correctness theorems. PAC correct...
The Relaxed Online Maximum Margin Algorithm
 Machine Learning
, 2000
"... We describe a new incremental algorithm for training linear threshold functions: the Relaxed Online Maximum Margin Algorithm, or ROMMA. ROMMA can be viewed as an approximation to the algorithm that repeatedly chooses the hyperplane that classifies previously seen examples correctly with the maximum ..."
Abstract

Cited by 74 (1 self)
 Add to MetaCart
(Show Context)
We describe a new incremental algorithm for training linear threshold functions: the Relaxed Online Maximum Margin Algorithm, or ROMMA. ROMMA can be viewed as an approximation to the algorithm that repeatedly chooses the hyperplane that classifies previously seen examples correctly with the maximum margin. It is known that such a maximummargin hypothesis can be computed by minimizing the length of the weight vector subject to a number of linear constraints. ROMMA works by maintaining a relatively simple relaxation of these constraints that can be eciently updated. We prove a mistake bound for ROMMA that is the same as that proved for the perceptron algorithm. Our analysis implies that the more computationally intensive maximummargin algorithm also satis es this mistake bound; this is the rst worstcase performance guarantee for this algorithm. We describe some experiments using ROMMA and a variant that updates its hypothesis more aggressively as batch algorithms to recognize handwr...
Generalization Performance of Regularization Networks and Support . . .
 IEEE TRANSACTIONS ON INFORMATION THEORY
, 2001
"... We derive new bounds for the generalization error of kernel machines, such as support vector machines and related regularization networks by obtaining new bounds on their covering numbers. The proofs make use of a viewpoint that is apparently novel in the field of statistical learning theory. The hy ..."
Abstract

Cited by 72 (18 self)
 Add to MetaCart
(Show Context)
We derive new bounds for the generalization error of kernel machines, such as support vector machines and related regularization networks by obtaining new bounds on their covering numbers. The proofs make use of a viewpoint that is apparently novel in the field of statistical learning theory. The hypothesis class is described in terms of a linear operator mapping from a possibly infinitedimensional unit ball in feature space into a finitedimensional space. The covering numbers of the class are then determined via the entropy numbers of the operator. These numbers, which characterize the degree of compactness of the operator, can be bounded in terms of the eigenvalues of an integral operator induced by the kernel function used by the machine. As a consequence, we are able to theoretically explain the effect of the choice of kernel function on the generalization performance of support vector machines.
Simplified PACBayesian margin bounds
 In COLT
, 2003
"... Abstract. The theoretical understanding of support vector machines is largely based on margin bounds for linear classifiers with unitnorm weight vectors and unitnorm feature vectors. Unitnorm margin bounds have been proved previously using fatshattering arguments and Rademacher complexity. Recen ..."
Abstract

Cited by 53 (3 self)
 Add to MetaCart
(Show Context)
Abstract. The theoretical understanding of support vector machines is largely based on margin bounds for linear classifiers with unitnorm weight vectors and unitnorm feature vectors. Unitnorm margin bounds have been proved previously using fatshattering arguments and Rademacher complexity. Recently Langford and ShaweTaylor proved a dimensionindependent unitnorm margin bound using a relatively simple PACBayesian argument. Unfortunately, the LangfordShaweTaylor bound is stated in a variational form making direct comparison to fatshattering bounds difficult. This paper provides an explicit solution to the variational problem implicit in the LangfordShaweTaylor bound and shows that the PACBayesian margin bounds are significantly tighter. Because a PACBayesian bound is derived from a particular prior distribution over hypotheses, a PACBayesian margin bound also seems to provide insight into the nature of the learning bias underlying the bound. 1
Algorithmic Stability and Generalization Performance
, 2001
"... We present a novel way of obtaining PACstyle bounds on the generalization error of learning algorithms, explicitly using their stability properties. A stable learner is one for which the learned solution does not change much with small changes in the training set. The bounds we obtain do not depend ..."
Abstract

Cited by 40 (2 self)
 Add to MetaCart
We present a novel way of obtaining PACstyle bounds on the generalization error of learning algorithms, explicitly using their stability properties. A stable learner is one for which the learned solution does not change much with small changes in the training set. The bounds we obtain do not depend on any measure of the complexity of the hypothesis space (e.g. VC dimension) but rather depend on how the learning algorithm searches this space, and can thus be applied even when the VC dimension is infinite. We demonstrate that regularization networks possess the required stability property and apply our method to obtain new bounds on their generalization performance.
Classification on proximity data with lp–machines
, 1999
"... We provide a new linear program to deal with classification of data in the case of functions written in terms of pairwise proximities. This allows to avoid the problems inherent in using feature spaces with indefinite metric in Support Vector Machines, since the notion of a margin is purely needed i ..."
Abstract

Cited by 38 (10 self)
 Add to MetaCart
(Show Context)
We provide a new linear program to deal with classification of data in the case of functions written in terms of pairwise proximities. This allows to avoid the problems inherent in using feature spaces with indefinite metric in Support Vector Machines, since the notion of a margin is purely needed in input space where the classification actually occurs. Moreover in our approach we can enforce sparsity in the proximity representation by sacrificing training error. This turns out to be favorable for proximity data. Similar to –SV methods, the only parameter needed in the algorithm is the (asymptotical) number of data points being classified with a margin. Finally, the algorithm is successfully compared with –SV learning in proximity space and K–nearestneighbors on real world data from Neuroscience and molecular biology. 1
Distinctive feature detection using Support Vector Machines
 Proc. Int. Conf. on Acoustics, Speech, and Signal Processing (ICASSP‘99
, 1999
"... An important aspect of distinctive feature based approaches to automatic speech recognition is the formulation of a framework for robust detection of these features. We discuss the application of the support vector machines (SVM) that arise when the structural risk minimization principle is applied ..."
Abstract

Cited by 33 (2 self)
 Add to MetaCart
(Show Context)
An important aspect of distinctive feature based approaches to automatic speech recognition is the formulation of a framework for robust detection of these features. We discuss the application of the support vector machines (SVM) that arise when the structural risk minimization principle is applied to such feature detection problems. In particular, we describe the problem of detecting stop consonants in continuous speech and discuss an SVM framework for detecting these sounds. In this paper we use both linear and nonlinear SVMs for stop detection and present experimental results to show that they perform better than a cepstral features based hidden Markov model (HMM) system, on the same task. 1.