Title
Polynomial threshold functions, AC0 functions, and spectral norms
Abstract
The class of polynomial-threshold functions is studied using harmonic analysis, and the results are used to derive lower bounds related to AC/sup 0/ functions. A Boolean function is polynomial threshold if it can be represented as a sign function of a sparse polynomial (one that consists of a polynomial number of terms). The main result is that polynomial-threshold functions can be characterized by means of their spectral representation. In particular, it is proved that a Boolean function whose L/sub 1/ spectral norm is bounded by a polynomial in n is a polynomial-threshold function, and that a Boolean function whose L/sub infinity //sup -1/ spectral norm is not bounded by a polynomial in n is not a polynomial-threshold function. Some results for AC/sup 0/ functions are derived.
Year
DOI
Venue
1992
10.1137/0221003
SFCS '90 Proceedings of the 31st Annual Symposium on Foundations of Computer Science
Keywords
DocType
Volume
polynomial threshold function,ac0 function,spectral norm,boolean functions,lower bound,neural networks,spectrum,computational modeling,polynomials,boolean function,circuits,harmonic analysis
Journal
21
Issue
ISSN
ISBN
1
0097-5397
0-8186-2082-X
Citations 
PageRank 
References 
37
5.37
5
Authors
2
Name
Order
Citations
PageRank
Jehoshua Bruck13256374.15
Roman Smolensky211814.12