提出融合线性规划与组合算法优势的新框架,高效解决三类边缘着色超图聚类问题。
Improved Algorithms for Overlapping and Robust Clustering of Edge-Colored Hypergraphs: An LP-Based Combinatorial Approach
- 基于线性规划的组合式算法框架,兼顾精度与效率。
- 在三种聚类场景下均实现高质量解,实验与理论分析一致。
- 适用于需要处理重叠簇和异常点的大规模数据聚类任务。
聚类是机器学习与数据挖掘中的基础任务。边缘着色聚类(ECC)针对类别型数据提供有效方法:给定边带颜色的超图,目标是为顶点分配颜色以最小化边端点颜色与边颜色不一致的数量。传统ECC要求非重叠且全覆盖,限制了应用。为此研究了三种变体:允许重叠的局部与全局ECC,以及可处理顶点异常的鲁棒ECC。现有方法包括线性规划(LP)舍入算法(精度高但慢)和贪婪组合算法(快但质量低)。本文提出一种结合两者优势的算法框架,实验证明其对三类问题均能高效生成高质量解。理论分析还给出了不可近似性结果与整数规划间隙界,表明进一步理论突破可能性极小,并解决了文献中两个开放问题。
原文摘要 · Abstract (English)
Clustering is a fundamental task in both machine learning and data mining. Among various methods, edge-colored clustering (ECC) has emerged as a useful approach for handling categorical data. Given a hypergraph with (hyper)edges labeled by colors, ECC aims to assign vertex colors to minimize the number of edges where the vertex color differs from the edge's color. However, traditional ECC has inherent limitations, as it enforces a nonoverlapping and exhaustive clustering. To tackle these limitations, three versions of ECC have been studied: Local ECC and Global ECC, which allow overlapping clusters, and Robust ECC, which accounts for vertex outliers. For these problems, both linear programming (LP) rounding algorithms and greedy combinatorial algorithms have been proposed. While these LP-rounding algorithms provide high-quality solutions, they demand substantial computation time; the greedy algorithms, on the other hand, run very fast but often compromise solution quality. In this paper, we present an algorithmic framework that combines the strengths of LP with the computational efficiency of combinatorial algorithms. Both experimental and theoretical analyses show that our algorithms efficiently produce high-quality solutions for all three problems: Local, Global, and Robust ECC. We complement our algorithmic contributions with complexity-theoretic inapproximability results and integrality gap bounds, which suggest that significant theoretical improvements are unlikely. Our results also answer two open questions previously raised in the literature.
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