BanTH: A Multi-label Hate Speech Detection Dataset for Transliterated Bangla

Fabiha Haider, Fariha Tanjim Shifat, Md Farhan Ishmam, Md Sakib Ul Rahman Sourove, Deeparghya Dutta Barua, Md Fahim, Md Farhad Alam Bhuiyan


Abstract
The proliferation of transliterated texts in digital spaces has emphasized the need for detecting and classifying hate speech in languages beyond English, particularly in low-resource languages. As online discourse can perpetuate discrimination based on target groups, e.g. gender, religion, and origin, multi-label classification of hateful content can help in understanding hate motivation and enhance content moderation. While previous efforts have focused on monolingual or binary hate classification tasks, no work has yet addressed the challenge of multi-label hate speech classification in transliterated Bangla. We introduce BanTH, the first multi-label transliterated Bangla hate speech dataset. The samples are sourced from YouTube comments, where each instance is labeled with one or more target groups, reflecting the regional demographic. We propose a novel translation-based LLM prompting strategy that translates or transliterates under-resourced text to higher-resourced text before classifying the hate group(s). Experiments reveal further pre-trained encoders achieving state-of-the-art performance on the BanTH dataset while translation-based prompting outperforms other strategies in the zero-shot setting. We address a critical gap in Bangla hate speech and set the stage for further exploration into code-mixed and multi-label classification in underrepresented languages.
Anthology ID:
2025.findings-naacl.403
Volume:
Findings of the Association for Computational Linguistics: NAACL 2025
Month:
April
Year:
2025
Address:
Albuquerque, New Mexico
Editors:
Luis Chiruzzo, Alan Ritter, Lu Wang
Venue:
Findings
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Publisher:
Association for Computational Linguistics
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Pages:
7217–7236
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https://preview.aclanthology.org/fix-sig-urls/2025.findings-naacl.403/
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Cite (ACL):
Fabiha Haider, Fariha Tanjim Shifat, Md Farhan Ishmam, Md Sakib Ul Rahman Sourove, Deeparghya Dutta Barua, Md Fahim, and Md Farhad Alam Bhuiyan. 2025. BanTH: A Multi-label Hate Speech Detection Dataset for Transliterated Bangla. In Findings of the Association for Computational Linguistics: NAACL 2025, pages 7217–7236, Albuquerque, New Mexico. Association for Computational Linguistics.
Cite (Informal):
BanTH: A Multi-label Hate Speech Detection Dataset for Transliterated Bangla (Haider et al., Findings 2025)
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https://preview.aclanthology.org/fix-sig-urls/2025.findings-naacl.403.pdf