Pre-trained Language Models Return Distinguishable Probability Distributions to Unfaithfully Hallucinated Texts

Taehun Cha; Donghun Lee

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arXiv · 2409.16658

Pre-trained Language Models Return Distinguishable Probability Distributions to Unfaithfully Hallucinated Texts

Taehun Cha·Donghun Lee

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Abstract

In this work, we show the pre-trained language models return distinguishable generation probability and uncertainty distribution to unfaithfully hallucinated texts, regardless of their size and structure. By examining 24 models on 6 data sets, we find out that 88-98% of cases return statistically significantly distinguishable generation probability and uncertainty distributions. Using this general phenomenon, we showcase a hallucination-reducing training algorithm. Our algorithm outperforms other baselines by achieving higher faithfulness metrics while maintaining sound general text quality measures.

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Taehun Cha, Donghun Lee. 2024-09-25. Pre-trained Language Models Return Distinguishable Probability Distributions to Unfaithfully Hallucinated Texts. https://arxiv.org/abs/2409.16658

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