How Fine-Tuning Objectives Shape Layer-Wise Information in LLM Hallucination Detection.

arXiv:2610.27711v1 Announce Type: new Abstract: Under matched conditions, classifier-head fine-tuning (\textsc{cls}) paradigm consistently outperforms the LLM-as-Judge sequence-to-sequence (\textsc{s2s}) on binary hallucination detection. We trace this gap to