Author

Yusuke Matsui

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Preprint Aug 2026

Fast Construction of Learned Count-Min Sketch via Ternary Search

The Learned Count-Min Sketch (LCMS) is a learned data structure that estimates element frequencies in a multiset and has been experimentally shown to outperform classical data structures in the capacity-accuracy trade-off. However, its performance depends heavily on parameter selection. Because systematic optimization...

Ryusuke Inami, Yusuke Matsui · 0 citations

#machine learning Preprint Sep 2026

Poisoning Attacks on the PGM-index

The results reveal that, despite the optimality of its PLAs, the PGM-index has an intrinsic vulnerability rooted in its optimization objective, motivating robustness-aware objective design for future learned indexes.

Atsuki Sato, Martin Aumüller, Yusuke Matsui · 0 citations