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Seungyoon Lee

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#machine learning Preprint Sep 2026

Refusal Localizes, the Damage Relocates: Safety Layers Under Few-Sample Fine-Tuning

Fine-tuning adapts aligned large language models (LLMs) to downstream tasks, but a few dozen harmful examples can remove their refusal of harmful requests. Prior work localizes safety-related behavior to specific layers, directions, and tokens, suggesting targets for protection. We test whether successful localization...

Jungseob Lee, D. Lee, Sugyeong Eo et al. · 1 citation
#artificial intelligence Preprint Oct 2026

Distilling Directional Verification

Knowledge distillation aims to transfer the factual knowledge of large language models to smaller models for efficient deployment. Yet a teacher may recall a relation in one direction while failing to generate the answer in the reverse direction. Distillation from its generated answers can therefore propagate this dire...

Jungseob Lee, Sugyeong Eo, Seongtae Hong et al. · 0 citations
Preprint Aug 2026

CultureConverse: A Multilingual Multi-turn Simulation Harness for Culturally Grounded Assistance in East and Southeast Asia

CultureConverse is introduced, a scalable, multilingual simulation and evaluation harness for culturally grounded assistant dialogue that covers 10 East and Southeast Asian regions, 58 subgroup identities, and 7 domains and performance gains from fine-tuning on 27,860 high-quality CultureConverse-DS samples improve in-...

Bryan Chen Zhengyu Tan, Wei-Hua Zheng, Thong T. Doan et al. · 0 citations
#machine learning Preprint Sep 2026

Where Activation Sparsity and KV-Cache Sparsity Cross in LLM Decoding

A byte crossover is derived, the context length at which the two savings are equal, together with ideal speedup bounds for each branch and for their composition, from model dimensions and keep ratios alone and is derived at https://github.com/js-lee-AI/ByteCross.

Jungseob Lee, Seungyoon Lee, Seongtae Hong et al. · 1 citation
Preprint Aug 2026

Language Chain in Alignment: Cross-lingual Ranking Preference Optimization

This paper proposes Cross-lingual Ranking Preference Optimization~ (CRPO), a novel framework that leverages robust preference knowledge from English to facilitate preference alignment in the target language, thereby enhancing language adaptation and output quality.

Seungyoon Lee, Minhyuk Kim, Jungseob Lee et al. · 0 citations
Jul 2026

LAMAR: An Open Language-Aware Multilingual Alignment Reranker

This work releases LAMAR, a language aware multilingual cross encoder trained to account for both semantic relevance and language coherence, which achieves the best performance overall and across all languages examined individually on general multilingual reranking benchmarks.

Seongtae Hong, Youngjoon Jang, Jungseob Lee et al. · 0 citations
Jul 2026

Answer-Conditioned Chains of Thought Degrade Verifiable-Reasoning Distillation in Large Language Models

This work shows that training a strong instruction-tuned reasoning model on its own answer-conditioned chains sharply lowers its verifiable-reasoning accuracy, and generates answer-blind data, because no correctness filter can see this damage in the data.

Jungseob Lee, Seungyoon Lee, Suhyune Son et al. · 0 citations
#natural language process... Preprint Aug 2026

CultureConverse: A Multilingual Multi-turn Simulation Harness for Culturally Grounded Assistance in East and Southeast Asia

CultureConverse is introduced, a scalable, multilingual simulation and evaluation harness for culturally grounded assistant dialogue that covers 10 East and Southeast Asian regions, 58 subgroup identities, and 7 domains and performance gains from fine-tuning on 27,860 high-quality CultureConverse-DS samples improve in-...

Bryan Chen Zhengyu Tan, Weihua Zheng, Thong T. Doan et al. · 0 citations

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