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

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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.

fields

cs.CL 1

years

2025 1

verdicts

CONDITIONAL 1

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  • Detecting Spelling and Grammatical Anomalies in Russian Poetry Texts cs.CL · 2025-05-07 · conditional · none · ref 9 · internal anchor

    A new Russian poetry dataset and benchmark show that supervised classifiers trained on synthetic distortions detect grammatical defects (F0.5=0.86) while unsupervised and zero-shot methods perform near random.