Papers by Yani Ioannou
Reducing Hallucinations in LLMs via Factuality-Aware Preference Learning (2026.findings-acl)
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| Challenge: | Preference alignment methods can reinforce hallucinations when preference judgments reward fluency and confidence over factual correctness. |
| Approach: | They propose a method that corrects misordered preference pairs and adds a factuality-aware margin to emphasize pairs with clear correctness differences. |
| Outcome: | The proposed method improves factuality and reduces hallucination rates across seven open-weight LLMs. |