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Abstract:
In this paper, we study the k-means problem with (nonuniform) penalties (k-MPWP) which is a natural generalization of the classic k-means problem. In the k-MPWP, we are given an n-client set D subset of R-d, a penalty cost p (j) > 0 for each j. D, and an integer k <= n. The goal is to open a center subset F subset of R-d with vertical bar F vertical bar <= k and to choose a client subset P subset of D as the penalized client set such that the total cost (including the sum of squares of distance for each client in D\P to the nearest open center and the sum of penalty cost for each client in P) is minimized. We offer a local search (81 + epsilon)-approximation algorithm for the k-MPWP by using single-swap operation. We further improve the above approximation ratio to (25 + epsilon) by using multi-swap operation.
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JOURNAL OF COMBINATORIAL OPTIMIZATION
ISSN: 1382-6905
Year: 2019
Issue: 2
Volume: 37
Page: 439-453
1 . 0 0 0
JCR@2022
ESI Discipline: MATHEMATICS;
ESI HC Threshold:54
JCR Journal Grade:3
Cited Count:
WoS CC Cited Count: 17
SCOPUS Cited Count: 19
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 7
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