Colin Swaelens


2023

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Evaluating Existing Lemmatisers on Unedited Byzantine Greek Poetry
Colin Swaelens | Ilse De Vos | Els Lefever
Proceedings of the Ancient Language Processing Workshop

This paper reports on the results of a comparative evaluation in view of the development of a new lemmatizer for unedited, Byzantine Greek texts. For the experiment, the performance of four existing lemmatizers, all pre-trained on Ancient Greek texts, was evaluated on how well they could handle texts stemming from the Middle Ages and displaying quite some peculiarities. The aim of this study is to get insights into the pitfalls of existing lemmatistion approaches as well as the specific challenges of our Byzantine Greek corpus, in order to develop a lemmatizer that can cope with its peculiarities. The results of the experiment show an accuracy drop of 20pp. on our corpus, which is further investigated in a qualitative error analysis.

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Medieval Social Media: Manual and Automatic Annotation of Byzantine Greek Marginal Writing
Colin Swaelens | Ilse De Vos | Els Lefever
Proceedings of the 17th Linguistic Annotation Workshop (LAW-XVII)

In this paper, we present the interim results of a transformer-based annotation pipeline for Ancient and Medieval Greek. As the texts in the Database of Byzantine Book Epigrams have not been normalised, they pose more challenges for manual and automatic annotation than Ancient Greek, normalised texts do. As a result, the existing annotation tools perform poorly. We compiled three data sets for the development of an automatic annotation tool and carried out an inter-annotator agreement study, with a promising agreement score. The experimental results show that our part-of-speech tagger yields accuracy scores that are almost 50 percentage points higher than the widely used rule-based system Morpheus. In addition, error analysis revealed problems related to phenomena also occurring in current social media language.

2019

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Creating, Enriching and Valorizing Treebanks of Ancient Greek
Alek Keersmaekers | Wouter Mercelis | Colin Swaelens | Toon Van Hal
Proceedings of the 18th International Workshop on Treebanks and Linguistic Theories (TLT, SyntaxFest 2019)