A Hypergraph Dictatorship Test with Perfect Completeness

  • Authors:
  • Victor Chen

  • Affiliations:
  • Massachusetts Institute of Technology, Computer Science and Artificial Intelligence Laboratory,

  • Venue:
  • APPROX '09 / RANDOM '09 Proceedings of the 12th International Workshop and 13th International Workshop on Approximation, Randomization, and Combinatorial Optimization. Algorithms and Techniques
  • Year:
  • 2009

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Abstract

A hypergraph dictatorship test is first introduced by Samorodnitsky and Trevisan and serves as a key component in their unique games based ${\operatorname{PCP}}$ construction. Such a test has oracle access to a collection of functions and determines whether all the functions are the same dictatorship, or all their low degree influences are o (1). Their test makes q *** 3 queries, has amortized query complexity $1+O\left(\frac{\log q}{q}\right)$, but has an inherent loss of perfect completeness. In this paper we give an (adaptive) hypergraph dictatorship test that achieves both perfect completeness and amortized query complexity $1+O\left(\frac{\log q}{q}\right)$.