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Yihan Wu

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Book Open access Aug 2026

Structure-Aware Abstraction of Hierarchical Time Series

This work provides the first formal analysis of HTSA, proving its NP-hardness and showing that the objective is neither monotone nor submodular, and proposes OSS, whose discretized search provides a 1/alpha-approximation guarantee for each single optimal-subtree computation.

Yihan Wu, Xuliang Zhu, Guozhong Li et al. · Proceedings of the 32nd ACM... · 0 citations