By Alexander J. Smola, Peter Bartlett, Bernhard Schölkopf, Dale Schuurmans
The idea that of huge margins is a unifying precept for the research of many alternative techniques to the class of knowledge from examples, together with boosting, mathematical programming, neural networks, and help vector machines. the truth that it's the margin, or self belief point, of a classification--that is, a scale parameter--rather than a uncooked education errors that concerns has turn into a key instrument for facing classifiers. This publication indicates how this concept applies to either the theoretical research and the layout of algorithms.The booklet offers an summary of modern advancements in huge margin classifiers, examines connections with different tools (e.g., Bayesian inference), and identifies strengths and weaknesses of the strategy, in addition to instructions for destiny learn. one of the individuals are Manfred Opper, Vladimir Vapnik, and style Wahba.
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Extra resources for Advances in Large-Margin Classifiers
The basis given by the score map represents the direction in which the value of the ith coordinate increases while the others are fixed. 2) Here Ep denotes the expectation with respect to the density p. This metric is called the Fisher information metric and induces a 'natural' distance in the manifold. It can be used to measure the difference in the generative process between a pair of examples Xi and Xj via the score map U9(X) and I-I. , 1;1, depends on p and therefore on the parametrization O.
1) The feature-space mapping ¢ determines k uniquely, but k determines only the metric properties of the image under ¢ of the case-set X in feature space. ¢ is not in general invertible, and indeed ¢(X) need not even be a linear subspace of F. ¢ need not be and in general is not a linear mapping: indeed, addition and multiplication need not even be defined for elements of X, if, for example, they are strings. 2 41 Applying Linear Methods to Structured Objects The dual formulation often has a computational advantage over the primal formulation if the kernel function k is easy to compute, but the mapping to feature space ¢ is infeasible to compute.
This is particularly well suited for the use of Hidden Markov Models, thereby opening the door to a large class of applications like DNA analysis or speech recognition. The contribution of Oliver, Scholkopf, and Smola, deals with a related approach. It analyses Natural Regularization from Generative Models, corresponding to a class of kernels including those recently proposed by Jaakkola and Haussler [1999b]. The analysis hinges on information-geometric properties of the log proba bility density function (generative model) and known connections between support vector machines and regularization theory, and proves that the maximal margin term induced by the considered kernel corresponds to a penalizer computing the L2 norm weighted by the generative model.