arXiv:2603.15683stat.MLcs.LG2026-03被引 1

用拓扑与动态传输结合,捕捉点云演化中的局部结构突变。

Beyond Distance: Quantifying Point Cloud Dynamics with Persistent Homology and Dynamic Optimal Transport

  • 基于几何重构与拓扑重计算,实现动态结构的物理保真分析。
  • 提出多尺度熵指标,揭示全局转移与局部异步重连现象。
  • 适用于物理系统、生物聚集和脑影像等动态过程分析。

我们提出一种分析时序点云拓扑突变的框架,扩展了近期提出的拓扑最优传输(TpOT)距离。尽管TpOT将几何、同调与高阶关系统一为单一度量,其全局标量距离会掩盖动态相变过程中的瞬时、局部结构重组。为此,我们设计了一种分层动态评估框架,采用新颖的拓扑与超图重构策略。不直接插值抽象网络参数,而是插值底层空间几何并严格重算有效拓扑结构,确保物理保真性。沿测地线路径,引入多尺度指标:宏观指标(拓扑畸变与持久熵)捕捉全局变化,新提出的介观双视角超图熵(节点与边视角)检测高度敏感的异步局部重连。进一步将循环级熵变传播至单个顶点,形成点级拓扑场。在物理动力系统(瑞利-范德波尔极限环、双阱簇融合)、高维生物聚集(D'Orsogna模型)及纵向卒中fMRI数据上的广泛评估,验证了基于传输对齐与多尺度熵诊断结合在动态拓扑分析中的有效性。

原文摘要 · Abstract (English)

We introduce a framework for analyzing topological tipping in time-evolutionary point clouds by extending the recently proposed Topological Optimal Transport (TpOT) distance. While TpOT unifies geometric, homological, and higher-order relations into one metric, its global scalar distance can obscure transient, localized structural reorganizations during dynamic phase transitions. To overcome this limitation, we present a hierarchical dynamic evaluation framework driven by a novel topological and hypergraph reconstruction strategy. Instead of directly interpolating abstract network parameters, our method interpolates the underlying spatial geometry and rigorously recomputes the valid topological structures, ensuring physical fidelity. Along this geodesic, we introduce a set of multi-scale indicators: macroscopic metrics (Topological Distortion and Persistence Entropy) to capture global shifts, and a novel mesoscopic dual-perspective Hypergraph Entropy (node-perspective and edge-perspective) to detect highly sensitive, asynchronous local rewirings. We further propagate the cycle-level entropy change onto individual vertices to form a point-level topological field. Extensive evaluations on physical dynamical systems (Rayleigh-Van der Pol limit cycles, Double-Well cluster fusion), high-dimensional biological aggregation (D'Orsogna model), and longitudinal stroke fMRI data demonstrate the utility of combining transport-based alignment with multi-scale entropy diagnostics for dynamic topological analysis.

拓扑数据分析点云动态多尺度分析超图熵

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