Bipartite Flat-Graph Network for Nested Named Entity Recognition

In this paper, we propose a novel bipartite flat-graph network (BiFlaG) for nested named entity recognition (NER), which contains two subgraph modules: a flat NER module for outermost entities and a graph module for all the entities located in inner layers. Bidirectional LSTM (BiLSTM) and graph convolutional network (GCN) are adopted to jointly learn flat entities and their inner dependencies... (read more)

PDF Abstract ACL 2020 PDF ACL 2020 Abstract
TASK DATASET MODEL METRIC NAME METRIC VALUE GLOBAL RANK RESULT BENCHMARK
Named Entity Recognition ACE 2005 BiFlaG F1 75.1 # 7
Nested Mention Recognition ACE 2005 BiFlaG F1 75.1 # 5
Nested Named Entity Recognition ACE 2005 BiFlaG F1 75.1 # 8
Nested Named Entity Recognition GENIA BiFlaG F1 76.0 # 8
Named Entity Recognition GENIA BiFlaG F1 76.0 # 5

Methods used in the Paper