منابع مشابه
Oblivious Medians via Online Bidding
Following Mettu and Plaxton [22, 21], we study oblivious algorithms for the k-medians problem. Such an algorithm produces an incremental sequence of facility sets. We give improved algorithms, including a (24 + )-competitive deterministic polynomial algorithm and a 2e ≈ 5.44-competitive randomized non-polynomial algorithm. Our approach is similar to that of [18], which was done independently. W...
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In the incremental version of the well-known k-median problem the objective is to compute an incremental sequence of facility sets F1 ⊆ F2 ⊆ .... ⊆ Fn, where each Fk contains at most k facilities. We say that this incremental medians sequence is R-competitive if the cost of each Fk is at most R times the optimum cost of k facilities. The smallest such R is called the competitive ratio of the se...
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We introduce an online action recognition system that can be combined with any set of frame-by-frame feature descriptors. Our system covers the frame feature space with classifiers whose distribution adapts to the hardness of locally approximating the Bayes optimal classifier. An efficient nearest neighbour search is used to find and combine the local classifiers that are closest to the frames ...
متن کاملA pr 2 00 5 Online Medians via Online Bribery ( Extended Abstract )
Following Mettu and Plaxton [15, 16], we study online algorithms for the k-medians problem. Such an algorithm must produce an incremental sequence F1 ⊆ F2 ⊆ · · · ⊆ Fn ⊆ F of sets of facilities. Mettu and Plaxton show that online metric medians has a (roughly) 40-competitive deterministic polynomial-time algorithm. We give improved algorithms, including a (24 + ǫ)competitive deterministic polyn...
متن کاملar X iv : c s . D S / 05 04 10 3 v 2 24 J an 2 00 6 Oblivious Medians via Online Bidding ( Extended Abstract )
Following Mettu and Plaxton [22, 21], we study oblivious algorithms for the k-medians problem. Such an algorithm produces an incremental sequence of facility sets. We give improved algorithms, including a (24 + ǫ)-competitive deterministic polynomial algorithm and a 2e ≈ 5.44-competitive, randomized, non-polynomial algorithm. Our approach is similar to that of [18], which was done independently...
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ژورنال
عنوان ژورنال: Algorithmica
سال: 2007
ISSN: 0178-4617,1432-0541
DOI: 10.1007/s00453-007-9005-x