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Dongyub 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 Sep 2026

Risk-Controlled Selective LLM Answering by Pricing Label-Free Checks

PriceCheck is introduced, which builds a compact family of decision rules from label-free checks such as re-solving a problem, and shows that choosing how checks are combined and stopped matters alongside how well a verifier ranks answers.

D. Lee, Jungseob Lee, Chanjun Park et al. · 2 citations
#machine learning Preprint Sep 2026

Faster Block-Diffusion Serving with Distribution-Free Risk Guarantees

Redline is a finite-sample procedure that selects operating points, hand-picked or learned, from the correctness of their answers on calibration prompts, and keeps the reference-relative risk, the joint probability that the reference answers correctly and a candidate configuration does not, within a user-chosen budget...

Jungseob Lee, D. Lee, Chanjun Park et al. · 1 citation
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

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