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arXiv 1606.03357cs.CG
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几何有助于比较持久性图

Geometry Helps to Compare Persistence Diagrams

Michael Kerber, Dmitriy Morozov, Arnur Nigmetov

摘要:

利用几何结构来改善离散指派问题的渐近复杂性是一个很好的研究课题。相比之下,使用几何学解决这类问题的实际优势还没有得到探讨。我们实现几何变种的Hopcroft-卡普算法的瓶颈匹配(根据以前的工作Efrat等人)。和Bertsekas的拍卖算法的Wasserstein距离计算。这两种实现都使用k-d树来用几何邻近查询代替线性扫描。我们对这个问题的兴趣源于计算持久性图之间距离的愿望,这是拓扑数据分析中经常出现的问题。我们表明,我们的几何匹配算法导致大量的性能增益,无论是在运行时间和内存消耗,在他们的纯组合的同行。此外,我们的实现明显优于唯一的其他实现可用于比较持久性图。

英文摘要:

Exploiting geometric structure to improve the asymptotic complexity of discrete assignment problems is a well-studied subject. In contrast, the practical advantages of using geometry for such problems have not been explored. We implement geometric variants of the Hopcroft--Karp algorithm for bottleneck matching (based on previous work by Efrat el al.) and of the auction algorithm by Bertsekas for Wasserstein distance computation. Both implementations use k-d trees to replace a linear scan with a geometric proximity query. Our interest in this problem stems from the desire to compute distances between persistence diagrams, a problem that comes up frequently in topological data analysis. We show that our geometric matching algorithms lead to a substantial performance gain, both in running time and in memory consumption, over their purely combinatorial counterparts. Moreover, our implementation significantly outperforms the only other implementation available for comparing persistence diagrams.

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