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Disambiguation Model for Bio-Medical Named Entity Recognition

  • A. KumarEmail author
Chapter
Part of the Studies in Big Data book series (SBD, volume 68)

Abstract

Discovery of biomedical named entities is one of the preliminary steps for many biomedical texts mining task. In the biomedical domain, typical entities are present, including disease, chemical, gene, and protein. To find these entities, currently, a deep learning-based approach applied into the Biomedical Named Entity Recognition (Bio_NER) which gives prominent results. Although deep learning-based approach gives a satisfactory result, still a tremendous amount of data is required for training because a lack of data can be one of the barriers in the performance of Bio_NER. There is one more obstacle in the path of Bio_NER is polysemy or misclassification of the entity in bio-entity. Which means one biomedical entity might have a different meaning in different places, i.e., a gene named entity may be labeled as disease name. When Conditional Random Field combined with deep learning-based approach i.e. Bidirectional Long Short Term Memory (Bi-LSTM), It mistakenly labeled a gene entity “BRCA1” as a disease entity which is “BRCA1 abnormality” or “Braca1-deficient” present in the training dataset. Similarly, “VHL (Von Hippel-Lindau disease),” which is one of the genes named labeled as a disease by Bi-LSTM CRF Model. One more problem is addressed in this chapter, as bio-med domain, entities are long and complex like cell whose name is “A375M (B-Raf (V600E)) is a human melanoma cell line”, in this biomedical entity, multiple words are present, but still it is difficult to find the context information of this particular bio-entity. For lack of data and entity misclassification problem, this chapter embeds multiple Bio_NER models. In the proposed model, the model trained with different datasets is connected so that the targeted model obtained the information by combining another model, which reduce the false-positives rate. Recurrent Neural Network (RNN) which is dependent upon the Bi-LSTM gates are introduced to handle the long and complex range dependencies in biomedical entities. BioCreative II GM Corpus, Pubmed, Gold-standard dataset, and JNLPBA dataset are used in this research work.

Keywords

Information extraction Bio-Medical Name Entity Recognition (Bio-NER) Conditional Random Field (CRF) Deep learning Machine Learning (ML) Long Short Term Memory Network (LSTM) Text mining 

Abbreviations

CRF

Conditional random field

LSTM

Long short term memory

BILSTM

Bidirectional long short term memory

BioNER

Biomedical named entity recognition

NER

Named entity recognition

MTM

Multi task model

WE

Word embedding

CE

Character embedding

Notes

Acknowledgements

The authors would like to thank the National Institute of Technology Raipur for providing necessary infrastructure and facility for doing research.

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© Springer Nature Switzerland AG 2020

Authors and Affiliations

  1. 1.Department of Computer Science and EngineeringNational Institute of Technology RaipurRaipurIndia

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