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- W3101188882 abstract "Named Entity Recognition (NER) is a fundamental task in natural language processing. In order to identify entities with nested structure, many sophisticated methods have been recently developed based on either the traditional sequence labeling approaches or directed hypergraph structures. Despite being successful, these methods often fall short in striking a good balance between the expression power for nested structure and the model complexity. To address this issue, we present a novel nested NER model named HIT. Our proposed HIT model leverages two key properties pertaining to the (nested) named entity, including (1) explicit boundary tokens and (2) tight internal connection between tokens within the boundary. Specifically, we design (1) Head-Tail Detector based on the multi-head self-attention mechanism and bi-affine classifier to detect boundary tokens, and (2) Token Interaction Tagger based on traditional sequence labeling approaches to characterize the internal token connection within the boundary. Experiments on three public NER datasets demonstrate that the proposed HIT achieves state-of-the-art performance." @default.
- W3101188882 created "2020-11-23" @default.
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- W3101188882 date "2020-01-01" @default.
- W3101188882 modified "2023-10-16" @default.
- W3101188882 title "HIT: Nested Named Entity Recognition via Head-Tail Pair and Token Interaction" @default.
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- W3101188882 doi "https://doi.org/10.18653/v1/2020.emnlp-main.486" @default.
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