arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2012.01967cs.CG
收藏

绘制持久性图

Sketching Persistence Diagrams

Donald R. Sheehy, Siddharth Sheth

摘要:

给定一个持久性图与$n$点,我们给出了一个算法,产生一个序列的$n$持久性图收敛在瓶颈距离的输入图,其中的$i$ th有$i$不同的(加权)点,是一个$2$ -近似最接近的持久性图与许多不同的点。对于每一个近似,我们预先计算的$i$ th和$(i+1)$ st之间的最佳匹配。也许令人惊讶的是,整个序列的图以及序列的匹配可以表示在$O(n)$空间。主要的方法是使用持久性图的贪婪置换的变体来给出良好的Hausdorff近似并为这些子集分配权重。我们给出了一个新的算法来有效地计算这个置换,尽管高隐维的持久性图中的点,由于对角线的效果。草图的结构也允许快速(线性时间)近似图之间的豪斯多夫距离-瓶颈距离的下限。为了近似瓶颈距离,草图也可以用于直接计算线性尺寸的邻域图,从而避免了对用于瓶颈计算的现有技术方法中使用的几何数据结构的需要。

英文摘要:

Given a persistence diagram with $n$ points, we give an algorithm that produces a sequence of $n$ persistence diagrams converging in bottleneck distance to the input diagram, the $i$th of which has $i$ distinct (weighted) points and is a $2$-approximation to the closest persistence diagram with that many distinct points. For each approximation, we precompute the optimal matching between the $i$th and the $(i+1)$st. Perhaps surprisingly, the entire sequence of diagrams as well as the sequence of matchings can be represented in $O(n)$ space. The main approach is to use a variation of the greedy permutation of the persistence diagram to give good Hausdorff approximations and assign weights to these subsets. We give a new algorithm to efficiently compute this permutation, despite the high implicit dimension of points in a persistence diagram due to the effect of the diagonal. The sketches are also structured to permit fast (linear time) approximations to the Hausdorff distance between diagrams -- a lower bound on the bottleneck distance. For approximating the bottleneck distance, sketches can also be used to compute a linear-size neighborhood graph directly, obviating the need for geometric data structures used in state-of-the-art methods for bottleneck computation.

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。

↑