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Can LLM be a Personalized Judge?

2024/06/17 by Yijiang River Dong, Tiancheng Hu, Dong, Yijiang River +3 · 47 citations
Psychology · Social Sciences · #Computation and Language (cs.CL) #Computer science #Computers and Society (cs.CY) #FOS: Computer and information sciences #Judicial and Constitutional Studies #Legal Education and Practice Innovations #Legal Systems and Judicial Processes #Psychology

paper · pdf · doi:10.48550/arxiv.2406.11657

published in arXiv (Cornell University) (Cornell University)

openalex publication_date 2024/06/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01

Abstract

Ensuring that large language models (LLMs) reflect diverse user values and preferences is crucial as their user bases expand globally. It is therefore encouraging to see the growing interest in LLM personalization within the research community. However, current works often rely on the LLM-as-a-Judge approach for evaluation without thoroughly examining its validity. In this paper, we investigate the reliability of LLM-as-a-Personalized-Judge, asking LLMs to judge user preferences based on personas. Our findings suggest that directly applying LLM-as-a-Personalized-Judge is less reliable than previously assumed, showing low and inconsistent agreement with human ground truth. The personas typically used are often overly simplistic, resulting in low predictive power. To address these issues, we introduce verbal uncertainty estimation into the LLM-as-a-Personalized-Judge pipeline, allowing the model to express low confidence on uncertain judgments. This adjustment leads to much higher agreement (above 80%) on high-certainty samples for binary tasks. Through human evaluation, we find that the LLM-as-a-Personalized-Judge achieves comparable performance to third-party humans evaluation and even surpasses human performance on high-certainty samples. Our work indicates that certainty-enhanced LLM-as-a-Personalized-Judge offers a promising direction for developing more reliable and scalable methods for evaluating LLM personalization.

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