Prediction, Learning, Uniform Convergence, and Scale-Sensitive Dimensions.
Journal of Computer and System Sciences(1998)
Abstract
We present a new general-purpose algorithm for learning classes of [0, 1] -valued functions in a generalization of the prediction model and prove a general upper bound on the expected absolute error of this algorithm in terms of a scale-sensitive generalization of the Vapnik dimension proposed by Alon, Ben-David, Cesa-Bianchi, and Haussler. We give lower bounds implying that our upper bounds cannot be improved by more than a constant factor in general. We apply this result, together with techniques due to Haussler and to Benedek and Itai, to obtain new upper bounds on packing numbers in terms of this scale-sensitive notion of dimension. Using a different technique, we obtain new bounds on packing numbers in terms of Kearns and Schapire's fat-shattering function. We show how to apply both packing bounds to obtain improved general bounds on the sample complexity of agnostic learning. For each epsilon > 0, we establish weaker sufficient and stronger necessary conditions for a class of [0, 1] -valued functions to be agnostically learnable to within epsilon and to be an E-uniform Glivenko-Cantelli class. (C) Academic Press.
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Key words
scale-sensitive dimension,uniform convergence
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