PolarizedTeam at SemEval-2026 Task 9: Detecting Multilingual, Multicultural and Multievent Online Polarization

Maria Nestor, Maroan Al Shrafat, Ioana Pește, Daniela Gifu, Diana Trandabăț


Abstract
This paper presents the systems developed for SemEval-2026 Task 9, which targets the detection and categorization of multilingual, multicultural, and multi-event online polarization across 22 languages. To address the challenges posed by linguistic diversity and short, heterogeneous texts, we evaluate several Transformer-based architectures for multilingual polarization detection. Our approach models the task as a multi-label classification problem and incorporates mean pooling for sentence representation, focal loss to mitigate severe label imbalance, and label-wise attention mechanisms to capture polarization-specific linguistic cues. Experimental results show that combining robust multilingual encoders with label-aware modelling substantially improves the detection of polarized content across diverse communities and events
Anthology ID:
2026.semeval-1.180
Volume:
Proceedings of the 20th International Workshop on Semantic Evaluation (2026)
Month:
July
Year:
2026
Address:
San Diego, California, USA
Editors:
Ekaterina Kochmar, Debanjan Ghosh, Kai North, Mamoru Komachi
Venues:
SemEval | WS
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
1391–1397
Language:
URL:
https://preview.aclanthology.org/ingest-acl-workshops/2026.semeval-1.180/
DOI:
Bibkey:
Cite (ACL):
Maria Nestor, Maroan Al Shrafat, Ioana Pește, Daniela Gifu, and Diana Trandabăț. 2026. PolarizedTeam at SemEval-2026 Task 9: Detecting Multilingual, Multicultural and Multievent Online Polarization. In Proceedings of the 20th International Workshop on Semantic Evaluation (2026), pages 1391–1397, San Diego, California, USA. Association for Computational Linguistics.
Cite (Informal):
PolarizedTeam at SemEval-2026 Task 9: Detecting Multilingual, Multicultural and Multievent Online Polarization (Nestor et al., SemEval 2026)
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PDF:
https://preview.aclanthology.org/ingest-acl-workshops/2026.semeval-1.180.pdf
Supplementarymaterial:
 2026.semeval-1.180.SupplementaryMaterial.zip