Stefán Ólafsson
Also published as: Stefan Olafsson
2026
The Icelandic Language Biobank: Data Collection through a Clinical Analysis Platform
Iris Nowenstein | Naizeth Núñez Macías | Gunnar Thor Örnólfsson | Stefán Ólafsson | Bryndís Bergþórsdóttir | Iðunn Kristínardóttir | Hinrik Hafsteinsson
Proceedings of the Sixth Resources and ProcessIng of linguistic, para-linguistic and extra-linguistic Data from people with various forms of cognitive/psychiatric/developmental impairments in cooperation with the MENTAL.ai consortium
Iris Nowenstein | Naizeth Núñez Macías | Gunnar Thor Örnólfsson | Stefán Ólafsson | Bryndís Bergþórsdóttir | Iðunn Kristínardóttir | Hinrik Hafsteinsson
Proceedings of the Sixth Resources and ProcessIng of linguistic, para-linguistic and extra-linguistic Data from people with various forms of cognitive/psychiatric/developmental impairments in cooperation with the MENTAL.ai consortium
Recent work on clinical applications of language technology shows considerable potential for people with speech and language symptoms and disorders, including for the diagnosis and monitoring of diseases and disorders as well as the development of novel communication aids. This has resulted in a variety of digital health tools becoming accessible, including personalized automatic speech recognition for disordered speech and the monitoring of disease progression in neurodegeneration through language samples. Currently, these tools are almost exclusively accessible to speakers of high-resource languages. A major hurdle for small, lower-resourced language communities in this context is the creation of clinical language corpora. We describe ongoing efforts to build the necessary infrastructure for clinical speech and language data collection in Iceland through the Icelandic Language Biobank, a resource that leverages collaboration with clinicians and robust linguistically-informed data collection against data scarcity.
2025
Aligning Language Models for Icelandic Legal Text Summarization
Þórir Hrafn Harðarson | Hrafn Loftsson | Stefán Ólafsson
Proceedings of the Joint 25th Nordic Conference on Computational Linguistics and 11th Baltic Conference on Human Language Technologies (NoDaLiDa/Baltic-HLT 2025)
Þórir Hrafn Harðarson | Hrafn Loftsson | Stefán Ólafsson
Proceedings of the Joint 25th Nordic Conference on Computational Linguistics and 11th Baltic Conference on Human Language Technologies (NoDaLiDa/Baltic-HLT 2025)
The integration of language models in the legal domain holds considerable promise for streamlining processes and improving efficiency in managing extensive workloads. However, the specialized terminology, nuanced language, and formal style of legal texts can present substantial challenges. This study examines whether preference-based training techniques, specifically Reinforcement Learning from Human Feedback and Direct Preference Optimization, can enhance models’ performance in generating Icelandic legal summaries that align with domain-specific language standards and user preferences. We compare models fine-tuned with preference training to those using conventional supervised learning. Results indicate that preference training improves the legal accuracy of generated summaries over standard fine-tuning but does not significantly enhance the overall quality of Icelandic language usage. Discrepancies between automated metrics and human evaluations further underscore the importance of qualitative assessment in developing language models for the legal domain.
2024
Evaluating Icelandic Sentiment Analysis Models Trained on Translated Data
Ólafur A. Jóhannsson | Birkir H. Arndal | Eysteinn Ö. Jónsson | Stefan Olafsson | Hrafn Loftsson
Proceedings of the 3rd Annual Meeting of the Special Interest Group on Under-resourced Languages @ LREC-COLING 2024
Ólafur A. Jóhannsson | Birkir H. Arndal | Eysteinn Ö. Jónsson | Stefan Olafsson | Hrafn Loftsson
Proceedings of the 3rd Annual Meeting of the Special Interest Group on Under-resourced Languages @ LREC-COLING 2024
We experiment with sentiment classification models for Icelandic that leverage machine-translated data for training. Since no large sentiment dataset exists for Icelandic, we translate 50,000 English IMDb reviews, classified either as positive or negative, into Icelandic using two services: Google Translate and GreynirTranslate. After machine translation, we assess whether the sentiment of the source language text is retained in the target language. Moreover, we evaluate the accuracy of the sentiment classifiers on non-translated Icelandic text.The performance of three types of baseline classifiers is compared, i.e., Support Vector Machines, Logistic Regression and Naive Bayes, when trained on translated data generated by either translation service. Furthermore, we fine-tune and evaluate three pre-trained transformer-based models, RoBERTa, IceBERT and ELECTRA, on both the original English texts and the translated texts. Our results indicate that the transformer models perform better than the baseline classifiers on all datasets. Moreover, our evaluation shows that the transformer models trained on data translated from English reviews can be used to effectively classify sentiment on non-translated Icelandic movie reviews.