Publications

This paper describes work towards the harmonization of the Greek Dependency Treebank with the Universal Dependencies v2 standard, and the extension of the treebank with enhanced dependencies. Experiments with the latest version of the UD_Greek resource have led to 88.94/87.66 LAS on gold/automatic POS, morphological features and lemmas..

This paper describes experiments for statistical dependency parsing using two different parsers trained on a recently extended dependency treebank for Greek, a language with a moderately rich morphology. We show how scores obtained by the two parsers are influenced by morphology and dependency types as well as sentence and arc length. The best LAS obtained in these experiments was 80.16 on a test set with manually validated POS tags and lemmas.

In this paper we give an overview of the approach adopted to add a layer of semantic information to the Greek Dependency Treebank [GDT]. Our ultimate goal is to come up with a large corpus, reliably annotated with rich semantic structures. To this end, a corpus has been compiled encompassing various data sources and domains. This collection has been preprocessed, annotated and validated on the basis of dependency representation. Taking into account multi-layered annotation schemes designed to provide deeper representations of structure and meaning, we describe the methodology followed as regards the semantic layer, we report on the annotation process and the problems faced and we conclude with comments on future work and exploitation of the resulting resource.