Download PDF by Luc Devroye: A Probabilistic Theory of Pattern Recognition

By Luc Devroye

ISBN-10: 1461207118

ISBN-13: 9781461207115

ISBN-10: 146126877X

ISBN-13: 9781461268772

Pattern reputation provides essentially the most major demanding situations for scientists and engineers, and plenty of various methods were proposed. the purpose of this publication is to supply a self-contained account of probabilistic research of those methods. The ebook features a dialogue of distance measures, nonparametric equipment in response to kernels or nearest pals, Vapnik-Chervonenkis idea, epsilon entropy, parametric category, blunders estimation, loose classifiers, and neural networks. anywhere attainable, distribution-free homes and inequalities are derived. a considerable component of the implications or the research is new. Over 430 difficulties and workouts supplement the material.

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Example text

Not only measures how spread out the mass of X is, but also provides us with concrete computational bounds for certain algorithms. In the simple example above, H. is in fact proportional to the expected computational time of the best algorithm. We are not interested in information theory per se, but rather in its usefulness in pattern recognition. For our discussion, if we fix X = x, then Y is Bernoulli (17(x)). (1](X), 1 -7](X)) = -1](X)lOg1](X)- (J -17(X))log(l-7](X)). It measures the amount of uncertainty or chaos in Y given X = x.

If fo and f 1 are nonoverl~·ping, that is, J fo/1 = 0, then obviously L * =0. Assume moreover that p = 1/2. Then L* J ~J = ~ min(f0 (x), /J(x))dx = /J(x)- (/J(x)- fo(x))+dx ~ = ~2 4 J 1/J(x)- fo(x)ldx. Here g+ denotes the positive part of a function g. Thus, the Bayes error is directly related to the L 1 distance between the class densities. 3. The shaded area is the L 1 distance between the class-conditional densities. 5 Plug-In Decisions The best guess of Y from the observation X is the Bayes decision *(x) g ={ 0 I if ry(x):::; 1/2 otherwise ={ 0 1 if ry(x):::; 1 - ry(x) otherwise.

4 The Normal Distribution There are a few situations in which, by sheer accident, the Bayes rule is a linear discriminant. , that of the multivariate normal distribution. The general multivariate normal density is written as where m is the mean (both x and m are d-component column vectors), I; is the d x d covariance matrix, I:- 1 is the inverse of I:, and det(I:) is its determinant. We write f ~ N(m, I:). Clearly, if X has density f, then m = EX and I; = E{(X- m)(X- m)T}. The multivariate normal density is completely specified by d + (~) formal parameters (m and I:).

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A Probabilistic Theory of Pattern Recognition by Luc Devroye


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