Hiroki Shibata

Subsequence Matching and LCS under Cartesian-Tree Equivalence

2024 · arXiv (Cornell University)

Two strings of the same length are said to Cartesian-tree match (CT-match) if their Cartesian-trees are isomorphic [Park et al., TCS 2020]. Cartesian-tree matching is a natural model that allows for capturing similarities of numerical …

Interactive Topic Modeling Using GDM

2025 · IEICE Transactions on Information and Systems

This paper proposes an interactive topic modeling system based on GDM (Geometric Dirichlet Means). Topic modeling is a kind of unsupervised learning and aims to extract topics from a set of documents. The problem is …