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arXiv 2104.07710cs.CGcs.DS
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持久图间1-Wasserstein距离的近似算法

Approximation algorithms for 1-Wasserstein distance between persistence diagrams

Samantha Chen, Yusu Wang

摘要:

近年来,使用拓扑摘要,特别是持久性图(编码所谓的持久同源性)分析复杂形状的巨大增长。直观地说,持久同源性将一个潜在的复杂输入对象(可以是图、图像或点集等)映射到一个统一类型的特征摘要,称为持久性图。然后可以使用这种持久性图表示来执行下游数据分析任务。一个关键的问题是有效地计算两个持久性图之间的距离。特别地,持久性图本质上是平面上的多点集,一个流行的距离是持久性图之间的所谓1-Wasserstein距离。在本文中,我们提出了两个算法来近似的1-Wasserstein距离持久图在近线性时间。这些算法主要遵循与现有的两个算法相同的思想,通过随机移位四叉树来近似欧几里德空间中两个有限点集之间的最优传输。我们展示了如何这些算法可以有效地适应持久性图的情况下。我们的算法是更有效的比以前的精确和近似算法,无论是在理论上和实践中,我们通过大量的实验证明了它的效率。它们在概念上很简单,易于实现,代码在github上公开。

英文摘要:

Recent years have witnessed a tremendous growth using topological summaries, especially the persistence diagrams (encoding the so-called persistent homology) for analyzing complex shapes. Intuitively, persistent homology maps a potentially complex input object (be it a graph, an image, or a point set and so on) to a unified type of feature summary, called the persistence diagrams. One can then carry out downstream data analysis tasks using such persistence diagram representations. A key problem is to compute the distance between two persistence diagrams efficiently. In particular, a persistence diagram is essentially a multiset of points in the plane, and one popular distance is the so-called 1-Wasserstein distance between persistence diagrams. In this paper, we present two algorithms to approximate the 1-Wasserstein distance for persistence diagrams in near-linear time. These algorithms primarily follow the same ideas as two existing algorithms to approximate optimal transport between two finite point-sets in Euclidean spaces via randomly shifted quadtrees. We show how these algorithms can be effectively adapted for the case of persistence diagrams. Our algorithms are much more efficient than previous exact and approximate algorithms, both in theory and in practice, and we demonstrate its efficiency via extensive experiments. They are conceptually simple and easy to implement, and the code is publicly available in github.

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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