Çağrı Çöltekin

Çağrı Çöltekin works in computational linguistics, with papers here that span multilingual syntactic analysis and the construction of annotated language resources. One strand concerns Universal Dependencies and parsing across many languages within a common annotation framework. Another addresses languages that have received little attention in natural language processing, Turkish in particular, by building new corpora with careful annotation schemes. Across both strands the work is grounded in data creation and shared evaluation rather than in a single model or method.

The most cited of these papers is CoNLL 2017 Shared Task: Multilingual Parsing from Raw Text to Universal Dependencies. It set participating systems the job of going from unprocessed text, without gold tokens, sentence boundaries or tags, to full dependency trees for dozens of languages. Test sets were kept hidden until the end and included "surprise" languages with almost no training material. Scoring relied on a labelled attachment measure computed over tokens aligned to the gold standard. The second most cited work, A Corpus of Turkish Offensive Language on Social Media, filled the absence of any labelled offensive-language resource for Turkish. It sampled tweets at random from the stream rather than filtering by keywords, which avoids topic bias. The tweets were labelled with a layered scheme modelled on target-oriented efforts such as OffensEval, separating targeted from untargeted offense and then distinguishing types of target.

The newer work turns from parsing toward social media text and the area of sentiment and emotion, while keeping a broader interest in multilingual and cross-lingual NLP. Çöltekin is based at the University of Tübingen, after earlier papers from the University of Groningen. The shared task brought collaboration with a large group of researchers, including Daniel Zeman, Christopher D. Manning and Filip Ginter.

Çağrı Çöltekin has 3 papers in our library, in 2017–2025, most of them on Universal Dependencies, Treebanks, Sentiment & emotion; often with Ali Elkahky, Aljoscha Burchardt, Anna Nedoluzhko.