By Robert E. Schapire

ISBN-10: 0262017180

ISBN-13: 9780262017183

Boosting is an method of laptop studying according to the assumption of making a hugely exact predictor by means of combining many vulnerable and misguided "rules of thumb." A remarkably wealthy concept has advanced round boosting, with connections to a variety of themes, together with records, online game conception, convex optimization, and knowledge geometry. Boosting algorithms have additionally loved functional luck in such fields as biology, imaginative and prescient, and speech processing. At numerous instances in its heritage, boosting has been perceived as mysterious, debatable, even paradoxical.This publication, written through the inventors of the strategy, brings jointly, organizes, simplifies, and considerably extends 20 years of analysis on boosting, offering either thought and purposes in a manner that's obtainable to readers from varied backgrounds whereas additionally delivering an authoritative reference for complex researchers. With its introductory remedy of all fabric and its inclusion of workouts in each bankruptcy, the e-book is suitable for path use to boot. The booklet starts with a normal creation to computer studying algorithms and their research; then explores the center thought of boosting, particularly its skill to generalize; examines many of the myriad different theoretical viewpoints that aid to give an explanation for and comprehend boosting; presents functional extensions of boosting for extra complicated studying difficulties; and at last provides a couple of complicated theoretical themes. various purposes and functional illustrations are provided all through.

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**Example text**

17) for every h ∈ H that is consistent with S. 18) for every h ∈ H that is consistent with S. 19) for every h ∈ H that is consistent with S. This theorem gives high-probability bounds on the true error of all consistent hypotheses. 19) states that, with probability at least 1 − δ, err(h) ≤ ε for every h ∈ H that is consistent with S (for values of ε as given in the theorem). In other words, using slightly different phrasing, each bound says that with probability at least 1 − δ, for every h ∈ H, if h is consistent with S, then err(h) ≤ ε.

There, because the two distributions are far from normal, the threshold between positives and negatives that is found by incorrectly assuming normality ends up being well away from optimal, regardless of how much training data is provided. 1), but we see in this example that an over-dependence on this assumption can yield poor performance. On the other hand, a discriminative approach to this problem in which the best threshold rule is selected based on its training error would be very likely to perform well, since the optimal classifier is a simple threshold here as well.

This is a shift in mind-set for the learning-system designer: instead of trying to design a learning algorithm that is accurate over the entire space, we can instead focus on finding weak learning algorithms that only need to be better than random. On the other hand, some caveats are certainly in order. The actual performance of boosting on a particular problem is clearly dependent on the data and the base learner. Consistent with the theory outlined above and discussed in detail in this book, boosting can fail to perform well, given insufficient data, overly complex base classifiers, or base classifiers that are too weak.

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