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arXiv 1002.2259cs.DScs.DMmath.CO
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离散极小化的构造性算法

Constructive Algorithms for Discrepancy Minimization

Nikhil Bansal

摘要:

给定集合系统(V,S),V={1,.,n}且S={S1,...,Sm},最小差异问题是找到V的2-着色,使得每个集合尽可能均匀地着色。在本文中,我们给出了第一个多项式时间算法的差异最小化,实现类似的边界已知存在使用所谓的熵方法。我们也给出了一个第一近似的结果的差异。我们算法的主要思想是通过让元素的颜色从0开始执行随机游走(以微小的增量),直到它们达到$-1$或$+1$,从而随着时间的推移产生着色。在每一个时间步的随机跳为各种元素相关的使用的解决方案,以一个半定的程序,其中该程序是由当前状态和熵的方法。

英文摘要:

Given a set system (V,S), V={1,...,n} and S={S1,...,Sm}, the minimum discrepancy problem is to find a 2-coloring of V, such that each set is colored as evenly as possible. In this paper we give the first polynomial time algorithms for discrepancy minimization that achieve bounds similar to those known existentially using the so-called Entropy Method. We also give a first approximation-like result for discrepancy. The main idea in our algorithms is to produce a coloring over time by letting the color of the elements perform a random walk (with tiny increments) starting from 0 until they reach $-1$ or $+1$. At each time step the random hops for various elements are correlated using the solution to a semidefinite program, where this program is determined by the current state and the entropy method.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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