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Manabu Okumura

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Who Laughs with Whom? Disentangling Influential Factors in Humor Preferences across User Clusters and LLMs

This study model heterogeneity in humor preferences in Oogiri by clustering users with voting logs and estimating cluster-specific weights over interpretable preference factors using Bradley-Terry-Luce models and finds that user clusters exhibit distinct preference patterns and that the LLM results can resemble those o...

Soichiro Murakami, Hidetaka Kamigaito, Hiroya Takamura et al. · 2 citations
Preprint Aug 2026

Simile Understanding in Text-to-Image Models: An Evaluation Framework

A scalable evaluation framework for simile understanding is proposed that includes a controlled simile dataset in which metaphorical vehicles are drawn from a predefined set of object-detectable categories and combined with diverse templates.

Luecheng Wang, Shintaro Ozaki, Hidetaka Kamigaito et al. · 0 citations
2026

Random Character-Level Perturbations Amplify LLM Jailbreak Attacks

This work finds that models cannot reliably reconstruct the original meaning and layer-wise probe classifiers fail to detect the harmful intent of perturbed prompts, and perturbations can occasionally reduce attack success by inducing off-topic or incoherent responses.

Shuyi Yu, Zhe Cao, Kohei Tsuji et al. · 1 citation

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