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Sampling and Counting Crossing-Free Matchings.

机译:采样和计数无交叉匹配。

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摘要

Sampling of combinatorial structures is an important statistical tool used in applications in a number of areas ranging from statistical physics, data mining, to biological sciences. Of comparable importance is the computation of the cor- responding partition function, which, in the case of the uniform distribution, is equivalent to the problem of counting all such structures. For self-reducible combinatorial structures, once we can produce an almost uniform sample from them, then we can approximately count them.;Using a Markov chain Monte Carlo method, this thesis presents polynomial-time algorithms to approximately count and almost uniformly sample crossing-free matchings for certain input classes of graphs. Since the problem in its generality appears to be difficult, we made natural restrictions on the in- put graphs. Namely, we consider vertices arranged in a grid in the plane, where edges are line segments connecting the vertices and a matching is crossing-free if no two matching edges intersect. For appropriate bounds on the dimensions of the grid and the edge lengths, we show that a natural Markov chain is rapidly mixing and that the problem is self-reducible.
机译:组合结构的采样是重要的统计工具,广泛用于从统计物理学,数据挖掘到生物科学的许多领域。具有相当重要意义的是相应分区函数的计算,在均匀分布的情况下,它等同于计算所有此类结构的问题。对于自简化组合结构,一旦我们可以从它们中产生几乎均匀的样本,就可以对其进行近似计数。;本文使用马尔可夫链蒙特卡洛方法,提出了多项式时间算法来近似计数并近似均匀地对样本进行交叉。图的某些输入类别的免费匹配。由于一般性问题似乎很困难,因此我们对输入图进行了自然限制。即,我们考虑在平面中以网格排列的顶点,其中边是连接顶点的线段,并且如果没有两个匹配边相交,则匹配是不交叉的。对于网格尺寸和边长的适当边界,我们显示出自然的马尔可夫链正在迅速混合,并且该问题是可自行解决的。

著录项

  • 作者

    Sun, Wenbo.;

  • 作者单位

    Rochester Institute of Technology.;

  • 授予单位 Rochester Institute of Technology.;
  • 学科 Computer science.
  • 学位 M.S.
  • 年度 2016
  • 页码 55 p.
  • 总页数 55
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 公共建筑;
  • 关键词

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