Algorithmic Learning Theory: 19th International Conference, by Imre Csiszár (auth.), Yoav Freund, László Györfi, György

By Imre Csiszár (auth.), Yoav Freund, László Györfi, György Turán, Thomas Zeugmann (eds.)

This booklet constitutes the refereed court cases of the nineteenth overseas convention on Algorithmic studying idea, ALT 2008, held in Budapest, Hungary, in October 2008, co-located with the eleventh foreign convention on Discovery technology, DS 2008.

The 31 revised complete papers offered including the abstracts of five invited talks have been rigorously reviewed and chosen from forty six submissions. The papers are devoted to the theoretical foundations of laptop studying; they deal with issues similar to statistical studying; likelihood and stochastic approaches; boosting and specialists; energetic and question studying; and inductive inference.

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Additional info for Algorithmic Learning Theory: 19th International Conference, ALT 2008, Budapest, Hungary, October 13-16, 2008. Proceedings

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4 The version here includes the regularization term for b suggested in a footnote of [10]. Generalization Bounds for Some Ordinal Regression Algorithms 19 6 Margin Bound for Chu & Keerthi’s Algorithm We consider now a different approach to analyzing ordinal regression algorithms that learn both a real-valued function f : X→R and a set of thresholds b1 ≤ . . ≤ br−1 ≤ br = ∞, and then make label predictions according to the prediction rule gf,b defined in Eq. (13) (recall that b is the threshold vector (b1 , .

The approach relies on linear-by-parts approximations of the ROC curve which correspond to finitedimensional (piecewise constant) approximations of optimal scoring functions. As the ROC curve provides a performance measure of functional nature, the approximation can be conceived in a variety of ways depending on the topology equipping the space of ROC curves. For instance, the AUC is related to the L1 distance but we will also consider convergence to the optimal ROC curve in a stronger sense described by the L∞ -distance.

There exists a sequence of piecewise constant scoring functions (sN )N ≥1 such that, for any N ≥ 1, sN ∈ SN and: d1 (s∗ , sN ) ≤ C · N −2 and d∞ (s∗ , sN ) ≤ C · N −2 , where the constant C depends only on the distribution. The approximation rate of O(N −2 ) is actually reached by any piecewise linear approximation provided that the mesh length is of order O(N −1 ). This result is well-known folklore in approximation theory, see [DL93]. We underline that the 28 S. Cl´emen¸con and N. Vayatis piecewise linear approximation method we describe next is adaptive in the sense that breakpoints are not fixed in advance and strongly depend on the target curve (which suggests that this scheme possibly yields a sharper constant C).

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