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arXiv · 2105.11301

DaN+: Danish Nested Named Entities and Lexical Normalization

Barbara Plank·Kristian Nørgaard Jensen·Rob van der Goot
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Abstract

This paper introduces DaN+, a new multi-domain corpus and annotation guidelines for Danish nested named entities (NEs) and lexical normalization to support research on cross-lingual cross-domain learning for a less-resourced language. We empirically assess three strategies to model the two-layer Named Entity Recognition (NER) task. We compare transfer capabilities from German versus in-language annotation from scratch. We examine language-specific versus multilingual BERT, and study the effect of lexical normalization on NER. Our results show that 1) the most robust strategy is multi-task learning which is rivaled by multi-label decoding, 2) BERT-based NER models are sensitive to domain shifts, and 3) in-language BERT and lexical normalization are the most beneficial on the least canonical data. Our results also show that an out-of-domain setup remains challenging, while performance on news plateaus quickly. This highlights the importance of cross-domain evaluation of cross-lingual transfer.

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Barbara Plank, Kristian Nørgaard Jensen, Rob van der Goot. 2021-05-24. DaN+: Danish Nested Named Entities and Lexical Normalization. https://arxiv.org/abs/2105.11301

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