Download An Introduction to Computational Learning Theory by Michael J. Kearns PDF

By Michael J. Kearns

Emphasizing problems with computational potency, Michael Kearns and Umesh Vazirani introduce a few primary themes in computational studying idea for researchers and scholars in man made intelligence, neural networks, theoretical machine technological know-how, and statistics.Computational studying conception is a brand new and quickly increasing zone of study that examines formal types of induction with the objectives of studying the typical equipment underlying effective studying algorithms and selecting the computational impediments to learning.Each subject within the booklet has been selected to clarify a normal precept, that's explored in an actual formal atmosphere. instinct has been emphasised within the presentation to make the fabric obtainable to the nontheoretician whereas nonetheless supplying special arguments for the expert. This stability is the results of new proofs of validated theorems, and new displays of the normal proofs.The issues coated contain the incentive, definitions, and primary effects, either confident and detrimental, for the commonly studied L. G. Valiant version of potentially nearly right studying; Occam's Razor, which formalizes a courting among studying and information compression; the Vapnik-Chervonenkis size; the equivalence of vulnerable and powerful studying; effective studying within the presence of noise through the strategy of statistical queries; relationships among studying and cryptography, and the ensuing computational barriers on effective studying; reducibility among studying difficulties; and algorithms for studying finite automata from energetic experimentation.

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Extra info for An Introduction to Computational Learning Theory

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Recal l th at e xcluding literals from h does no t affect consistency with the positive examples in S, since the set of positive examples of h only as we delete literals. However, the new algo rithm has to carefully choose which literals of h it excludes in order to ensure that the hypothes is grows is still consistent with all the negative examples in S. To do this, we cast the problem as an instance of the Set Cover Problem and apply the greedy algorithm. For each literal z appearing in h, we can identi fy a subset of the negative examples in S.

The next theorem, which is the main result of this chapter, states that any efficient Occam algorithm is also an efficient PAC learning algorithm. 1 (Occam's Razor) Le t L be an efficient (a,{3)-Occam al­ gorithm for C using 1i. Let V be the target distribution over the instance space X, let c E Cn be the target concept, and 0 < a constant a > 0 such that if L is given m examples drawn from m � a EX(c, V), (; IOg � + as where input m €, a 0 :5 1. Then there is random sample S of satisfies (n' SU:(C»Q»)�) then with probability at least 1-0 the output h of L s atisfies erro r(h ) $ Moreover L runs in time polynomial in n, size(c), l/f and 1/0.

Tn,ml grows only as mP, and therefore given any e, this is smaller than bem for a small value of m. 2. tn,m is bad if e1Tor(h) > e, where the error is of course measured with respect to the target concept c and Then by the independence of the random examples, the probability that a fixed bad hypothesis h is consistent with a randomly drawn sample of m examples from EX(c,1» is at most (1 e)m. t' is consistent with a random sample of size m is at most 11-l'I(I- e)m. m/(l- e) � 0. ml � mlog(l/{l e» -log(l/«5).

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