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FACTER: Fairness-Aware Conformal Thresholding and Prompt Engineering for Enabling Fair LLM-Based Recommender Systems

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arxiv 2502.02966 v1 pith:VSNSVLMX submitted 2025-02-05 cs.IR cs.AIcs.CYcs.LG

FACTER: Fairness-Aware Conformal Thresholding and Prompt Engineering for Enabling Fair LLM-Based Recommender Systems

classification cs.IR cs.AIcs.CYcs.LG
keywords facterpromptconformalengineeringfairnessfairness-awarellm-basedrecommendation
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We propose FACTER, a fairness-aware framework for LLM-based recommendation systems that integrates conformal prediction with dynamic prompt engineering. By introducing an adaptive semantic variance threshold and a violation-triggered mechanism, FACTER automatically tightens fairness constraints whenever biased patterns emerge. We further develop an adversarial prompt generator that leverages historical violations to reduce repeated demographic biases without retraining the LLM. Empirical results on MovieLens and Amazon show that FACTER substantially reduces fairness violations (up to 95.5%) while maintaining strong recommendation accuracy, revealing semantic variance as a potent proxy of bias.

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