ANHALTEN: Cross-Lingual Transfer for German Token-Level Reference-Free Hallucination Detection

Janek Herrlein, Chia-Chien Hung, Goran Glava�


Abstract
Research on token-level reference-free hallucination detection has predominantly focused on English, primarily due to the scarcity of robust datasets in other languages. This has hindered systematic investigations into the effectiveness of cross-lingual transfer for this important NLP application. To address this gap, we introduce ANHALTEN, a new evaluation dataset that extends the English hallucination detection dataset to German. To the best of our knowledge, this is the first work that explores cross-lingual transfer for token-level reference-free hallucination detection. ANHALTEN contains gold annotations in German that are parallel (i.e., directly comparable to the original English instances). We benchmark several prominent cross-lingual transfer approaches, demonstrating that larger context length leads to better hallucination detection in German, even without succeeding context. Importantly, we show that the sample-efficient few-shot transfer is the most effective approach in most setups. This highlights the practical benefits of minimal annotation effort in the target language for reference-free hallucination detection. Aiming to catalyze future research on cross-lingual token-level reference-free hallucination detection, we make ANHALTEN publicly available: https://github.com/janekh24/anhalten
Anthology ID:
2024.acl-srw.18
Volume:
Proceedings of the 62nd Annual Meeting of the Association for Computational Linguistics (Volume 4: Student Research Workshop)
Month:
August
Year:
2024
Address:
Bangkok, Thailand
Editors:
Xiyan Fu, Eve Fleisig
Venue:
ACL
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
186–194
Language:
URL:
https://aclanthology.org/2024.acl-srw.18
DOI:
Bibkey:
Cite (ACL):
Janek Herrlein, Chia-Chien Hung, and Goran Glava�. 2024. ANHALTEN: Cross-Lingual Transfer for German Token-Level Reference-Free Hallucination Detection. In Proceedings of the 62nd Annual Meeting of the Association for Computational Linguistics (Volume 4: Student Research Workshop), pages 186–194, Bangkok, Thailand. Association for Computational Linguistics.
Cite (Informal):
ANHALTEN: Cross-Lingual Transfer for German Token-Level Reference-Free Hallucination Detection (Herrlein et al., ACL 2024)
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PDF:
https://aclanthology.org/2024.acl-srw.18.pdf