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Fourier Concentration from Shrinkage

机译:傅里叶浓度来自收缩

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For Boolean functions computed by de Morgan formulas of sub quadratic size or read-once de Morgan formulas, we prove a sharp concentration of the Fourier mass on "small-degree" coefficients. For a Boolean function f: {0, 1}^nto {1, -1} computable by a de Morgan formula of size s, we show that [ sum_{Asubseteq [n]:, |A|>s^{1/Gamma + epsilon}} hat{f}(A)^2 leq exp(-s^{epsilon/3}), ] where Gamma is the shrinkage exponent for the corresponding class of formulas: Gamma=2 for de Morgan formulas, and Gamma=1/log_2(sqrt{5}-1)approx 3.27 for read-once de Morgan formulas. We prove that this Fourier concentration is essentially optimal. As an application, we get that sub quadratic-size de Morgan formulas have negligible correlation with parity, and are learnable under the uniform distribution, and also lossily compressible, in sub exponential time. Finally, we establish the tight Theta(s^{1/Gamma}) bound on the average sensitivity of read-once formulas of size s, this mirrors the known tight bound Theta(sqrt{s}) on the average sensitivity of general de Morgan formulas of size s.
机译:对于由De Morgan公式计算的Boolean函数,由Sub二次尺寸或阅读摩根公式计算,我们证明了“小程度”系数上的傅里叶质量的急剧浓度。对于一个布尔函数f:{0,1} ^ no {1,-1}由de摩根公式计算的大小s,我们展示了[sum_ {asubseteq [n]:,| a |> s ^ {1 /伽马+ epsilon}}帽子{f}(a)^ 2 leq exp(-s ^ {epsilon / 3}),其中伽玛是相应类公式的收缩指数:伽马= 2用于de摩根公式, GAMMA = 1 / log_2(SQRT {5} -1)约3.27用于阅读默诺摩根公式。我们证明这种傅立叶浓度基本上是最佳的。作为申请,我们得到了亚二次尺寸的摩根公式的相关性与平价可忽略不计,并且在均匀分布下可以在均匀分布下进行,并且在子指数时间内造成可压缩。最后,我们建立了在尺寸S的读取式公式的平均敏感度的紧密θ(s ^ {1 / gamma}),这反映了已知的紧密绑定的θ(sqrt {s})普通德的平均敏感性摩根公式的规模。

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