Veera Raghavendra Chikka


2022

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Biomedical NER using Novel Schema and Distant Supervision
Anshita Khandelwal | Alok Kar | Veera Raghavendra Chikka | Kamalakar Karlapalem
Proceedings of the 21st Workshop on Biomedical Language Processing

Biomedical Named Entity Recognition (BMNER) is one of the most important tasks in the field of biomedical text mining. Most work so far on this task has not focused on identification of discontinuous and overlapping entities, even though they are present in significant fractions in real-life biomedical datasets. In this paper, we introduce a novel annotation schema to capture complex entities, and explore the effects of distant supervision on our deep-learning sequence labelling model. For BMNER task, our annotation schema outperforms other BIO-based annotation schemes on the same model. We also achieve higher F1-scores than state-of-the-art models on multiple corpora without fine-tuning embeddings, highlighting the efficacy of neural feature extraction using our model.

2016

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CDE-IIITH at SemEval-2016 Task 12: Extraction of Temporal Information from Clinical documents using Machine Learning techniques
Veera Raghavendra Chikka
Proceedings of the 10th International Workshop on Semantic Evaluation (SemEval-2016)