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Get Advances in Large-Margin Classifiers PDF

By Alexander J. Smola, Peter Bartlett, Bernhard Schölkopf, Dale Schuurmans

ISBN-10: 0262194481

ISBN-13: 9780262194488

The idea that of enormous margins is a unifying precept for the research of many various techniques to the type of information from examples, together with boosting, mathematical programming, neural networks, and aid 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 blunders that issues has turn into a key device for facing classifiers. This e-book exhibits how this concept applies to either the theoretical research and the layout of algorithms.The ebook presents an outline of contemporary advancements in huge margin classifiers, examines connections with different equipment (e.g., Bayesian inference), and identifies strengths and weaknesses of the tactic, in addition to instructions for destiny examine. one of the participants are Manfred Opper, Vladimir Vapnik, and style Wahba.

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2 gives the pseudocode for the algorithm. It returns a convex combination of classifiers from a class G, by using a learning algorithm L that takes as input a training sample X, Y and a distribution D on X (not to be confused with the true distribution p), and returns a classifier from G. The algorithm L aims to minimize training error on X, Y, weighted according to D . 87) AdaBoost iteratively combines the classifiers returned by L. The idea behind Ad­ aBoost is to start with a uniform weighting over the training sample, and pro­ gressively adjust the weights to emphasize the examples that have been frequently misclassified by the classifiers returned by L.

M Dl(i } = : 11m endfor for all t from {1 ,... ,T} : L(X ,Y,Dt } gt = m : L Dt(i }l gt ("" li'lli et = i=l : at = of functions from G , f= E i'=l atgt . � ln (�) Zt = : 2 Jet(1 - et } for all i from i= 1 ,... 5 ET t _l atgt T l at Ei= • Empirical Results, Implementations, and Further Developments Large margin classifiers are not only promising from the theoretical point of view. They also have proven to be competitive or superior to other learning algorithms in practical applications. In the following we will give references to such situations.

To get an intuition about what this regularizer does, let us spell it out ex­ plicitly. The solution of SV regression using the Fisher kernel has the form f(x) = L:� D:ikyat(x,Xi), where the Xi are the SVs, and a is the solution of l the SV progranIming problem. Applied to this function, we obtain IIf(O)IIL(p) = = / If(xWp(xIO)dX / (LiD:iVelnp(xIO)rlVelnp(XiIO» ) 2 p(xIO)dx. 12) and the empirical risk given by the normalized negative log likelihood. 12) prevents overfitting by fa­ voring solutions with smaller VeIn p(xIO).

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Advances in Large-Margin Classifiers by Alexander J. Smola, Peter Bartlett, Bernhard Schölkopf, Dale Schuurmans

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