Aligning the Norwegian UD Treebank with Entity and Coreference Information
This work provides a resource for Norwegian NLP tasks, but it is incremental as it focuses on data alignment and conversion rather than new methods.
The paper tackled the problem of aligning and merging entity and coreference annotations with Universal Dependencies treebanks for Norwegian, resulting in the first such enriched treebank for Bokmål and Nynorsk, with processes developed to handle misalignments and data errors.
This paper presents a merged collection of entity and coreference annotated data grounded in the Universal Dependencies (UD) treebanks for the two written forms of Norwegian: Bokmål and Nynorsk. The aligned and converted corpora are the Norwegian Named Entities (NorNE) and Norwegian Anaphora Resolution Corpus (NARC). While NorNE is aligned with an older version of the treebank, NARC is misaligned and requires extensive transformation from the original annotations to the UD structure and CoNLL-U format. We here demonstrate the conversion and alignment processes, along with an analysis of discovered issues and errors in the data - some of which include data split overlaps in the original treebank. These procedures and the developed system may prove helpful for future corpus alignment and coreference annotation endeavors. The merged corpora comprise the first Norwegian UD treebank enriched with named entities and coreference information.