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Youzhen Pang

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Open access 2026

PingAn-NLP at SemEval-2026 Task 9: Multi-Stage Alignment via GRPO and Tiered Ensemble Voting for Multilingual Polarization Detection

This paper presents the PingAn-NLP system developed for SemEval-2026 Task 9, focusing on multilingual online polarization identification across 18 languages. We pro-pose a multi-stage optimization framework combining Supervised Fine-Tuning (SFT) and Group Relative Policy Optimization (GRPO). To overcome label imbalance...

Diyang Chen, Youzhen Pang · SemEval@ACL · 0 citations