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Cross-type Biomedical Named Entity Recognition with Deep Multi-Task Learning

30 January 2018
Xuan Wang
Yu Zhang
Xiang Ren
Yuhao Zhang
Marinka Zitnik
Jingbo Shang
C. Langlotz
Jiawei Han
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Abstract

Motivation: State-of-the-art biomedical named entity recognition (BioNER) systems often require handcrafted features specific to each entity type, such as genes, chemicals and diseases. Although recent studies explored using neural network models for BioNER to free experts from manual feature engineering, the performance remains limited by the available training data for each entity type. Results: We propose a multi-task learning framework for BioNER to collectively use the training data of different types of entities and improve the performance on each of them. In experiments on 15 benchmark BioNER datasets, our multi-task model achieves substantially better performance compared with state-of-the-art BioNER systems and baseline neural sequence labeling models. Further analysis shows that the large performance gains come from sharing character- and word-level information among relevant biomedical entities across differently labeled corpora.

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