Claudia Kittask


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EstBERT: A Pretrained Language-Specific BERT for Estonian
Hasan Tanvir | Claudia Kittask | Sandra Eiche | Kairit Sirts
Proceedings of the 23rd Nordic Conference on Computational Linguistics (NoDaLiDa)

This paper presents EstBERT, a large pretrained transformer-based language-specific BERT model for Estonian. Recent work has evaluated multilingual BERT models on Estonian tasks and found them to outperform the baselines. Still, based on existing studies on other languages, a language-specific BERT model is expected to improve over the multilingual ones. We first describe the EstBERT pretraining process and then present the models’ results based on the finetuned EstBERT for multiple NLP tasks, including POS and morphological tagging, dependency parsing, named entity recognition and text classification. The evaluation results show that the models based on EstBERT outperform multilingual BERT models on five tasks out of seven, providing further evidence towards a view that training language-specific BERT models are still useful, even when multilingual models are available.


Is Similarity Visually Grounded? Computational Model of Similarity for the Estonian language
Claudia Kittask | Eduard Barbu
Proceedings of the International Conference on Recent Advances in Natural Language Processing (RANLP 2019)

Researchers in Computational Linguistics build models of similarity and test them against human judgments. Although there are many empirical studies of the computational models of similarity for the English language, the similarity for other languages is less explored. In this study we are chiefly interested in two aspects. In the first place we want to know how much of the human similarity is grounded in the visual perception. To answer this question two neural computer vision models are used and their correlation with the human derived similarity scores is computed. In the second place we investigate if language influences the similarity computation. To this purpose diverse computational models trained on Estonian resources are evaluated against human judgments