Austria

We developed an ensemble learning system that integrates multiple transformer-
based models, including RoBERTa-large and DeBERTa-v3-large. These models were trained using diverse data augmentation strategies, both lightweight and intensive, to increase generalization and robustness. The ensemble approach allowed us to
combine the strengths of different models through weighted soft voting.

ACL 2025

Anastasia at SemEval-2025 Task 9: Subtask 1, Ensemble Learning with Data Augmentation and Focal Loss for Food Risk Classification.

The purpose of the AAAI conference series is to promote research in Artificial Intelligence (AI) and foster scientific exchange between researchers, practitioners, scientists, students, and engineers across the entirety of AI and its affiliated disciplines. AAAI-23 is the Thirty-Seventh AAAI Conference on Artificial Intelligence. The theme of this conference is to create collaborative bridges within and beyond AI. Like previous AAAI conferences, AAAI-23 will feature technical paper presentations, special tracks, invited speakers, workshops, tutorials, poster sessions, senior member presentations, competitions, and exhibit programs, and two new activities: a Bridge Program and a Lab Program. Many of these activities are tailored to the theme of bridges and all are selected according to the highest standards, with additional programs for students and young researchers. 
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AAAI 2023

The purpose of the AAAI conference series is to promote research in Artificial Intelligence (AI) and foster scientific exchange between researchers, practitioners, scientists, students, and engineers across the entirety of AI and its affiliated disciplines.

poster

### Welcome to The 63rd Annual Meeting of the Association for Computational Linguistics (ACL 2025)

Message from the General Chair: 
*It is my great pleasure and honor to welcome you to the 63rd Annual Meeting of the Association for Computational Linguistics (ACL 2025), held in beautiful Vienna, Austria, from July 27 to August 1, 2025. ACL2025continues our field’s tradition of excellence in scholarship, innovation, and inclusivity, and I am deeply grateful to the many volunteers who have worked tirelessly to bring this event to life.* 
[Read more](https://drive.google.com/file/d/1GI_hvOpjswAuYdUTromfeDiPpCcqidwg/view?usp=sharing)

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Welcome to The 63rd Annual Meeting of the Association for Computational Linguistics (ACL 2025)

In this paper we present our participation in Subtask 2 of SemEval-2025 Task 10, focusing on the identification and classification of narratives in news of multiple languages, on climate change and the Ukraine-Russia war. To address this task, we employed a Zero-Shot approach using a generative Large Language Model (LLM) without prior training on the dataset. Our classification strategy is based on two steps: first, the system classifies the topic of each news item; subsequently, it identifies the sub-narratives directly at the finer granularity. We present a detailed analysis of the performance of our system compared to the best ranked systems on the leaderboard, highlighting the strengths and limitations of our approach.

UNEDTeam at SemEval-2025 Task 10: Zero-Shot Narrative Classification

This paper presents our system designed for Subtask 1 of SemEval-2025 Task 10, which focuses on multilingual entity framing in news articles. Given the complexity of the task—multi-label, multi-class classification across five languages—we propose an approach based on large language models (LLMs). Our method combines multilingual text translation, data augmentation, multi-model fine-tuning, and ensemble classification. First, we translate all texts into English to unify the datasets and apply synonym-based augmentation to address class imbalances. We then fine-tune multiple LLMs on the augmented data. Finally, a state-of-the-art LLM aggregates the individual model predictions for ensemble classification, yielding robust and accurate results. Our system achieved top positions in three languages (English, Portuguese, and Russian) and second place in Bulgarian.

DUTIR at SemEval-2025 Task 10: A Large Language Model-based Approach for Entity Framing in Online News

We present the Mu-SHROOM shared task which is focused on detecting hallucinations and other overgeneration mistakes in the output of instruction-tuned large language models (LLMs). Mu-SHROOM addresses general-purpose LLMs in 14 languages, and frames the hallucination detection problem as a span-labeling task.

iai_MSU at SemEval-2025 Task-3: Mu-SHROOM, the Multilingual Shared-task on Hallucinations and Related Observable Overgeneration Mistakes in English

This paper presents a zero-shot system for fact-checked claim retrieval. 
We employed several state-of-the-art large language models to obtain text embeddings. The models were then combined to obtain the best possible result.
Our approach achieved 7th place in monolingual and 9th in cross-lingual subtasks.
We used only English translations as an input to the text embedding models since multilingual models did not achieve satisfactory results. We identified the most relevant claims for each post by leveraging the embeddings and measuring cosine similarity. Overall, the best results were obtained by the NVIDIA NV-Embed-v2 model. For some languages, we benefited from model combinations (NV-Embed & GPT or Mistral).

UWBa at SemEval-2025 Task 7: Multilingual and Crosslingual Fact-Checked Claim Retrieval

We present a similarity-based method for explainable classification in the context of the SemEval 2025 Task 9: The Food Hazard Detection Challenge. Our proposed system is essentially unsupervised, leveraging the semantic properties of the labels. This approach brings some key advantages over typical classification systems. First, similarity metrics offer a more intuitive interpretation. Next, this technique allows for inference on novel labels. Finally, there is a non-negligible amount of ambiguous labels, so learning a direct mapping does not lead to meaningful representations. Our method is generic and can be applied to any classification task.

UniBuc at SemEval-2025 Task 9: Similarity Approaches to Classification

This paper presents a framework for perceived emotion intensity prediction, focusing on SemEval-2025 Task 11 Track B. The task involves predicting the intensity of five perceived emotions—anger, fear, joy, sadness, and surprise—on an ordinal scale from 0 (no emotion) to 3 (high emotion). Our approach builds upon our method introduced in the WASSA workshop and enhances it by integrating ModernBERT in place of the traditional BERT model within a boosting-based ensemble framework. To address the difficulty in capturing fine-grained emotional distinctions, we incorporate class-preserving mixup data augmentation, a custom Pearson CombinLoss function, and fine-tuned transformer models, including ModernBERT, RoBERTa, and DeBERTa. Compared to individual fine-tuned transformer models (BERT, RoBERTa, DeBERTa, and ModernBERT) without augmentation or ensemble learning, our approach demonstrates significant improvements. The proposed system achieves an average Pearson correlation coefficient of 0.768 on the test set, outperforming the best individual baseline model. In particular, the model performs best for sadness (r = 0.808) and surprise (r = 0.770), highlighting its ability to capture subtle intensity variations in the text. Despite these improvements, challenges such as data imbalance, performance on low resource emotions (e.g., anger and fear), and the need for refined data augmentation techniques remain open for future research.

tinaal at SemEval-2025 Task 11: Enhancing Perceived Emotion Intensity Prediction with Boosting Fine-Tuned Transformers

The SemEval-2025 Task 11, Bridging the Gap in Text-Based Emotion Detection, introduces an emotion recognition challenge span- ning over 28 languages. This competition encourages researchers to explore more advanced approaches to address the challenges posed by the diversity of emotional expressions and background variations. It features two tracks: multi-label classification (Track A) and emotion intensity prediction (Track B), covering six emotion categories: anger, fear, joy, sadness, surprise, and disgust. In our work, we systematically explore the benefits of two contrastive learning approaches: sample-based (Contrastive Reasoning Calibration) and generation-based (DPO, SimPO) contrastive learning. The sample-based contrastive approach trains the model by comparing two sam- ples to generate more reliable predictions. The generation-based contrastive approach trains the model to differentiate between correct and incorrect generations, refining its prediction. All models are fine-tuned from LLaMa3- Instruct-8B. Our system achieves 9th place in Track A and 6th place in Track B for English, while ranking among the top-tier performing systems for other languages.

Chinchunmei at SemEval-2025 Task 11: Boosting the Large Language Modelâ€™s Capability of Emotion Perception using Contrastive Learning

This paper describes the approach of the
Unibuc - NLP team in tackling the SemEval
2025 Workshop, Task 11: Bridging the Gap
in Text-Based Emotion Detection. We mainly
focused on experiments using large language
models (Gemini, Qwen, DeepSeek) with ei-
ther few-shot prompting or fine-tuning. With
our final system, for the multi-label emotion
detection track (track A), we got an F1-macro
of 0.7546 (26/96 teams) for the English sub-
set, 0.1727 (35/36 teams) for the Portuguese
(Mozambican) subset and 0.325 (1/31 teams)
for the Emakhuwa subset.

Team Unibuc - NLP at SemEval 2025 Task 11: Few-shot text-based emotion detection

To address the growing need for ESG verification, we propose an
NLP framework combining RAG and Structured Prompts for
multilingual ESG analysis. In SemEval-2025, our system ranked
4th in English (0.5611) and 1st in French (0.5747), outperforming
traditional methods and proving its scalability and reliability.

CYUT at SemEval-2025 Task 6: Prompting with Precision â€“ ESG Analysis via Structured Prompts

We showcase our approach for multilingual fact-checked claim retrieval, developed for SemEval 2025 Task 7. By adapting large language models with contrastive fine-tuning and techniques like LoRA and Prompt Tuning, we achieved strong results in both monolingual and crosslingual tracks. In this talk, we’ll share key insights, limitations, and future directions.

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UNEDTeam at SemEval-2025 Task 10: Zero-Shot Narrative Classification

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