GENUINE: Graph Enhanced Multi-level Uncertainty Estimation for Large Language Models

ACL ARR 2025 February Submission2216 Authors

Abstract: Uncertainty estimation is essential for enhancing the reliability of Large Language Models (LLMs), particularly in high-stakes applications. Existing methods often overlook semantic dependencies, relying on token-level probability measures that fail to capture structural relationships within the generated text. We propose GENUINE: Graph ENhanced mUlti-level uncertaINty Estimation for Large Language Models, a structure-aware framework that leverages dependency parse trees and hierarchical graph pooling to refine uncertainty quantification. By incorporating supervised learning, GENUINE effectively models semantic and structural relationships, improving confidence assessments. Extensive experiments across NLP tasks show that GENUINE achieves up to 29\% higher AUROC than semantic entropy-based approaches and reduces calibration errors by over 15\%, demonstrating the effectiveness of graph-based uncertainty modeling. The code is available at https://anonymous.4open.science/r/GUQ-39E7.

Paper Type: Long

Research Area: Machine Learning for NLP

Research Area Keywords: Machine Learning for NLP, Interpretability and Analysis of Models for NLP

Contribution Types: Model analysis & interpretability

Languages Studied: English

Submission Number: 2216