A Unified MRC Framework for Named Entity Recognition

ACL 2020 • Xiaoya Li • Jingrong Feng • Yuxian Meng • Qinghong Han • Fei Wu • Jiwei Li

The task of named entity recognition (NER) is normally divided into nested NER and flat NER depending on whether named entities are nested or not. Models are usually separately developed for the two tasks, since sequence labeling models, the most widely used backbone for flat NER, are only able to assign a single label to a particular token, which is unsuitable for nested NER where a token may be assigned several labels... (read more)

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 Ranked #1 on Named Entity Recognition on ACE 2005 (using extra training data)

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TASK DATASET MODEL METRIC NAME METRIC VALUE GLOBAL RANK USES EXTRA
TRAINING DATA 		RESULT BENCHMARK
Nested Mention Recognition ACE 2004 BERT-MRC F1 85.98 # 1
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Named Entity Recognition ACE 2005 BERT-MRC F1 86.88 # 1
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Named Entity Recognition CoNLL 2003 (English) BERT-MRC F1 93.04 # 13
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Nested Named Entity Recognition GENIA BERT-MRC F1 83.75 # 1
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Chinese Named Entity Recognition MSRA BERT-MRC F1 95.75 # 3
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Chinese Named Entity Recognition OntoNotes 4 BERT-MRC F1 82.11 # 2
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Named Entity Recognition Ontonotes v5 (English) BERT-MRC F1 91.11 # 3
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