Nelson Odhiambo Onyango


2025

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AfriHate: A Multilingual Collection of Hate Speech and Abusive Language Datasets for African Languages
Shamsuddeen Hassan Muhammad | Idris Abdulmumin | Abinew Ali Ayele | David Ifeoluwa Adelani | Ibrahim Said Ahmad | Saminu Mohammad Aliyu | Paul Röttger | Abigail Oppong | Andiswa Bukula | Chiamaka Ijeoma Chukwuneke | Ebrahim Chekol Jibril | Elyas Abdi Ismail | Esubalew Alemneh | Hagos Tesfahun Gebremichael | Lukman Jibril Aliyu | Meriem Beloucif | Oumaima Hourrane | Rooweither Mabuya | Salomey Osei | Samuel Rutunda | Tadesse Destaw Belay | Tadesse Kebede Guge | Tesfa Tegegne Asfaw | Lilian Diana Awuor Wanzare | Nelson Odhiambo Onyango | Seid Muhie Yimam | Nedjma Ousidhoum
Proceedings of the 2025 Conference of the Nations of the Americas Chapter of the Association for Computational Linguistics: Human Language Technologies (Volume 1: Long Papers)

Hate speech and abusive language are global phenomena that need socio-cultural background knowledge to be understood, identified, and moderated. However, in many regions of the Global South, there have been several documented occurrences of (1) absence of moderation and (2) censorship due to the reliance on keyword spotting out of context. Further, high-profile individuals have frequently been at the center of the moderation process, while large and targeted hate speech campaigns against minorities have been overlooked.These limitations are mainly due to the lack of high-quality data in the local languages and the failure to include local communities in the collection, annotation, and moderation processes. To address this issue, we present AfriHate: a multilingual collection of hate speech and abusive language datasets in 15 African languages. Each instance in AfriHate is a tweet annotated by native speakers familiar with the regional culture. We report the challenges related to the construction of the datasets and present various classification baseline results with and without using LLMs. We find that model performance highly depends on the language and that multilingual models can help boost performance in low-resource settings.