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conference paper

Approximating Linear Threshold Predicates

Cheraghchi, Mahdi
•
Hastad, Johan
•
Isaksson, Marcus
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2010
Proceedings of the 13th International Workshop on Approximation Algorithms for Combinatorial Optimization Problems (APPROX)
13th International Workshop on Approximation Algorithms for Combinatorial Optimization Problems (APPROX)

We study constraint satisfaction problems on the domain {-1,1}, where the given constraints are homogeneous linear threshold predicates. That is, predicates of the form sgn(w_1 x_1 + ... + w_n x_n) for some positive integer weights w_1, ..., w_n. Despite their simplicity, current techniques fall short of providing a classification of these predicates in terms of approximability. In fact, it is not easy to guess whether there exists a homogeneous linear threshold predicate that is approximation resistant or not. The focus of this paper is to identify and study the approximation curve of a class of threshold predicates that allow for non-trivial approximation. Arguably the simplest such predicate is the Majority predicate sgn(x_1+ ... + x_n), for which we obtain an almost complete understanding of the asymptotic approximation curve, assuming the Unique Games Conjecture. Our techniques extend to a more general class of "majority-like" predicates and we obtain parallel results for them. In order to classify these predicates, we introduce the notion of Chow-robustness that might be of independent interest.

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Type
conference paper
DOI
10.1007/978-3-642-15369-3_9
Web of Science ID

WOS:000284820600009

Author(s)
Cheraghchi, Mahdi
Hastad, Johan
Isaksson, Marcus
Svensson, Ola  
Date Issued

2010

Publisher

Springer-Verlag New York, Ms Ingrid Cunningham, 175 Fifth Ave, New York, Ny 10010 Usa

Published in
Proceedings of the 13th International Workshop on Approximation Algorithms for Combinatorial Optimization Problems (APPROX)
Series title/Series vol.

Lecture Notes in Computer Science

Subjects

algo_misc

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
THL2  
ALGO  
Event nameEvent placeEvent date
13th International Workshop on Approximation Algorithms for Combinatorial Optimization Problems (APPROX)

Barcelona, Spain

September 1-3, 2010

Available on Infoscience
September 16, 2010
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/53714
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