Marjan Kamyab

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2020

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If You Build Your Own NER Scorer, Non-replicable Results Will Come
Constantine Lignos | Marjan Kamyab
Proceedings of the First Workshop on Insights from Negative Results in NLP

We attempt to replicate a named entity recognition (NER) model implemented in a popular toolkit and discover that a critical barrier to doing so is the inconsistent evaluation of improper label sequences. We define these sequences and examine how two scorers differ in their handling of them, finding that one approach produces F1 scores approximately 0.5 points higher on the CoNLL 2003 English development and test sets. We propose best practices to increase the replicability of NER evaluations by increasing transparency regarding the handling of improper label sequences.
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