A Pseudorandom Generator for Functions of Low-Degree Polynomial Threshold Functions

Penghui Yao; Mingnan Zhao

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arXiv · 2504.10904

A Pseudorandom Generator for Functions of Low-Degree Polynomial Threshold Functions

Penghui Yao·Mingnan Zhao

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Abstract

Developing explicit pseudorandom generators (PRGs) for prominent categories of Boolean functions is a key focus in computational complexity theory. In this paper, we investigate the PRGs against the functions of degree-$d$ polynomial threshold functions (PTFs) over Gaussian space. Our main result is an explicit construction of PRG with seed length $\mathrm{poly}(k,d,1/\epsilon)\cdot\log n$ that can fool any function of $k$ degree-$d$ PTFs with probability at least $1-\varepsilon$. More specifically, we show that the summation of $L$ independent $R$-moment-matching Gaussian vectors $\epsilon$-fools functions of $k$ degree-$d$ PTFs, where $L=\mathrm{poly}( k, d, \frac{1}{\epsilon})$ and $R = O({\log \frac{kd}{\epsilon}})$. The PRG is then obtained by applying an appropriate discretization to Gaussian vectors with bounded independence.

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BibTeX RIS

Penghui Yao, Mingnan Zhao. 2025-04-15. A Pseudorandom Generator for Functions of Low-Degree Polynomial Threshold Functions. https://arxiv.org/abs/2504.10904

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