NLP-CIMAT at SemEval-2026 Task 9: LLM-Based One-Shot and Cross-Lingual Data Augmentation for Polarization Detection
Year: 2026
Type: conference-paper
Abstract: This paper describes our participation in Se-mEval 2026 Task 9: Multilingual Text Polarization.The task requires estimating polarization levels across languages, where linguistic variability and limited annotated data pose significant challenges.To address data scarcity, we propose a pipeline that combines cross-lingual translation, synthetic data augmentation via LLMs, and domain-specific pre-trained models.Our approach leverages the hypothesis that polarization signals can transfer across languages without substantial loss of semantic alignment, enabling effective data augmentation through translation.Notably, one-shot synthetic example generation emerges as a viable strategy for enriching training data in topic-specific scenarios.Experimental results demonstrate high stability and competitive performance, achieving a macro F1-score of 0.7869 for Spanish and 0.7939 for English on the test set, ranking 21th on the official English leaderboard, while our Spanish results are competitive with top-performing systems, corresponding to 7th place.
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W7166849560