Circuit Lower Bounds for MCSP from Local Pseudorandom Generators

Circuit Lower Bounds for MCSP from Local Pseudorandom Generators
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来自本地伪随机发生器的 MCSP 电路下界

DOI:
10.1145/3404860
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发表时间:
2020
影响因子:
0.7
通讯作者:
Cheraghchi M
Cheraghchi M
中科院分区:
--
文献类型:
--
作者:
Cheraghchi M

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最小电路尺寸问题(MCSP)询问对于给定的参数θ,布尔函数f的给定真值表是否可以通过尺寸最多为θ的布尔电路来计算。我们改进了MCSP的几个电路下界,使用伪随机发生器(PRG)是本地的; PRG被称为本地的,如果它的输出位串,当被视为一个布尔函数的真值表,可以计算的布尔电路的小尺寸。我们得到了新的和改进的下限MCSP几乎匹配最知名的下限对几个电路模型。具体来说,我们证明了在具有长度为N的真值表的函数上计算MCSP需要·N3−o(1)-size de Morgan公式,改进了Hirahara和Santhanam最近提出的N2 −o(1)下界(CCC,2017),·N2−o(1)-大小公式在任意基或一般分支程序(MCSP对这些模型没有已知的非平凡下限),和· 2Ω(N1/(d+1.01))大小的深度dAC 0电路,改进了Allender等人的(隐含的,在他们的工作中)指数大小下限。(SICOMP,2006)。上述AC 0下限与最著名的AC 0下限(对于奇偶性)相匹配,直到深度上的一个小的加性常数。此外,对于深度2电路的特殊情况(即,CNFs或DNF),我们得到了MCSP的最佳下界为2Ω(N)。
The Minimum Circuit Size Problem (MCSP) asks if a given truth table of a Boolean functionfcan be computed by a Boolean circuit of size at most θ, for a given parameter θ. We improve several circuit lower bounds for MCSP, using pseudorandom generators (PRGs) that are local; a PRG is calledlocalif its output bit strings, when viewed as the truth table of a Boolean function, can be computed by a Boolean circuit of small size. We get new and improved lower bounds for MCSP that almost match the best-known lower bounds against several circuit models. Specifically, we show that computing MCSP, on functions with a truth table of lengthN, requires•N3−o(1)-size de Morgan formulas, improving the recentN2−o(1)lower bound by Hirahara and Santhanam (CCC, 2017),•N2−o(1)-size formulas over an arbitrary basis or general branching programs (no non-trivial lower bound was known for MCSP against these models), and• 2Ω(N1/(d+1.01))-size depth-dAC0circuits, improving the (implicit, in their work) exponential size lower bound by Allender et al. (SICOMP, 2006).The AC0lower bound stated above matches the best-known AC0lower bound (for PARITY) up to a smalladditiveconstant in the depth. Also, for the special case of depth-2 circuits (i.e., CNFs or DNFs), we get an optimal lower bound of 2Ω(N)for MCSP.
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