Idioms are non-compositional linguistic expressions whose meanings cannot be directly inferred from the individual words that compose them, posing significant challenges for natural language processing systems. This paper describes the participation of the UMUTeam in Subtask A of the AdMIRe shared task (SemEval 2025), which focuses on understanding idiomatic expressions through visual and contextual representations in English and Portuguese. Specifically, the task involves ranking a set of images according to how well they represent the sense of a potentially idiomatic nominal compound within a given contextual sentence. To address this challenge, we adopted a multimodal approach that combines textual and visual features using pre-trained language models, such as BERT and XLM-RoBERTa, along with Vision Transformers. Additionally, we explored the in-context learning capabilities of Large Language Models (LLMs), particularly Llama-3.1-8B, for image classification. These models are trained using a regression approach to rank images according to their semantic alignment with the contextual meaning of idioms. The results show that the Llama-3.1-8B model performs best for English, ranking 32 out of 36, while the XLM + ViT model is more effective for Portuguese, ranking 21 out of 24.

Large Language Models like GPT-4, LLaMa, Mistral, and Gemma have revolutionized Natural Language Processing, advancing language comprehension, generation, and reasoning. However, they also present challenges, particularly the tendency to hallucinate—that is, to produce false or fabricated information. This paper presents our participation in Task 3 Mu-SHROOM of SemEval 2025, which focuses on detecting hallucinations in multilingual contexts. Specifically, the task requires identifying text segments generated by LLMs that correspond to hallucinations and calculating the hallucination probability for each character in the text. To address this challenge, we adopted a token classification approach using the pre-trained XLM-RoBERTa-large model, fine-tuned on the provided training set. Additionally, we integrated context from Llama-3.1-70B to enhance hallucination detection by leveraging its broader and more up-to-date knowledge base. Our approach combines the multilingual capability of XLM-RoBERTa with the contextual understanding of Llama-3.1-70B, producing a detailed hallucination probability for each character in the text. The results demonstrate that our approach consistently outperforms baseline methods across multiple languages, particularly in detecting token-level hallucinations.

In today’s digital age, the rapid dissemination of information through social networks poses significant challenges in verifying the veracity of shared content. The proliferation of misinformation can have serious consequences, influencing public opinion, policy decisions, and social dynamics. Fact-checking plays a critical role in countering misinformation; however, the manual verification process is time-consuming, especially when dealing with multilingual content. This paper presents our participation in the Multilingual and Crosslingual Fact-Checked Claim Retrieval task (SemEval 2025), which seeks to identify previously fact-checked claims relevant to social media posts. Our proposed system leverages XLM-RoBERTa, a multilingual Transformer model, combined with metric learning and hard negative mining strategies, to optimize the semantic comparison of posts and fact-checks across multiple languages. By fine-tuning a shared embedding space and employing a multiple similarity loss function, our approach enhances retrieval accuracy while maintaining efficiency. Evaluation results demonstrate competitive performance across multiple languages, reaching 25th place and highlighting the potential of multilingual NLP models in automating the fact-checking process and mitigating misinformation spread.

In these working notes we describe the UMUTeam’s participation in SemEval-2024 shared task 6, which aims at detecting grammatically correct output of Natural Language Generation with incorrect semantic information in two different setups: model-aware and model-agnostic tracks. The task is consists of three subtasks with different model setups. Our approach is based on exploiting the zero-shot classification capability of the Large Language Models LLaMa-2, Tulu and Mistral, through prompt engineering. Our system ranked eighteenth in the model-aware setup with an accuracy of 78.4% and 29th in the model-agnostic setup with an accuracy of 76.9333%.