Chaitanya Shivade


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Towards Visual Dialog for Radiology
Olga Kovaleva | Chaitanya Shivade | Satyananda Kashyap | Karina Kanjaria | Joy Wu | Deddeh Ballah | Adam Coy | Alexandros Karargyris | Yufan Guo | David Beymer Beymer | Anna Rumshisky | Vandana Mukherjee Mukherjee
Proceedings of the 19th SIGBioMed Workshop on Biomedical Language Processing

Current research in machine learning for radiology is focused mostly on images. There exists limited work in investigating intelligent interactive systems for radiology. To address this limitation, we introduce a realistic and information-rich task of Visual Dialog in radiology, specific to chest X-ray images. Using MIMIC-CXR, an openly available database of chest X-ray images, we construct both a synthetic and a real-world dataset and provide baseline scores achieved by state-of-the-art models. We show that incorporating medical history of the patient leads to better performance in answering questions as opposed to conventional visual question answering model which looks only at the image. While our experiments show promising results, they indicate that the task is extremely challenging with significant scope for improvement. We make both the datasets (synthetic and gold standard) and the associated code publicly available to the research community.

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Proceedings of the First Workshop on Natural Language Processing for Medical Conversations
Parminder Bhatia | Steven Lin | Rashmi Gangadharaiah | Byron Wallace | Izhak Shafran | Chaitanya Shivade | Nan Du | Mona Diab
Proceedings of the First Workshop on Natural Language Processing for Medical Conversations


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Towards Automatic Generation of Shareable Synthetic Clinical Notes Using Neural Language Models
Oren Melamud | Chaitanya Shivade
Proceedings of the 2nd Clinical Natural Language Processing Workshop

Large-scale clinical data is invaluable to driving many computational scientific advances today. However, understandable concerns regarding patient privacy hinder the open dissemination of such data and give rise to suboptimal siloed research. De-identification methods attempt to address these concerns but were shown to be susceptible to adversarial attacks. In this work, we focus on the vast amounts of unstructured natural language data stored in clinical notes and propose to automatically generate synthetic clinical notes that are more amenable to sharing using generative models trained on real de-identified records. To evaluate the merit of such notes, we measure both their privacy preservation properties as well as utility in training clinical NLP models. Experiments using neural language models yield notes whose utility is close to that of the real ones in some clinical NLP tasks, yet leave ample room for future improvements.

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Overview of the MEDIQA 2019 Shared Task on Textual Inference, Question Entailment and Question Answering
Asma Ben Abacha | Chaitanya Shivade | Dina Demner-Fushman
Proceedings of the 18th BioNLP Workshop and Shared Task

This paper presents the MEDIQA 2019 shared task organized at the ACL-BioNLP workshop. The shared task is motivated by a need to develop relevant methods, techniques and gold standards for inference and entailment in the medical domain, and their application to improve domain specific information retrieval and question answering systems. MEDIQA 2019 includes three tasks: Natural Language Inference (NLI), Recognizing Question Entailment (RQE), and Question Answering (QA) in the medical domain. 72 teams participated in the challenge, achieving an accuracy of 98% in the NLI task, 74.9% in the RQE task, and 78.3% in the QA task. In this paper, we describe the tasks, the datasets, and the participants’ approaches and results. We hope that this shared task will attract further research efforts in textual inference, question entailment, and question answering in the medical domain.


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Lessons from Natural Language Inference in the Clinical Domain
Alexey Romanov | Chaitanya Shivade
Proceedings of the 2018 Conference on Empirical Methods in Natural Language Processing

State of the art models using deep neural networks have become very good in learning an accurate mapping from inputs to outputs. However, they still lack generalization capabilities in conditions that differ from the ones encountered during training. This is even more challenging in specialized, and knowledge intensive domains, where training data is limited. To address this gap, we introduce MedNLI - a dataset annotated by doctors, performing a natural language inference task (NLI), grounded in the medical history of patients. We present strategies to: 1) leverage transfer learning using datasets from the open domain, (e.g. SNLI) and 2) incorporate domain knowledge from external data and lexical sources (e.g. medical terminologies). Our results demonstrate performance gains using both strategies.


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Addressing Limited Data for Textual Entailment Across Domains
Chaitanya Shivade | Preethi Raghavan | Siddharth Patwardhan
Proceedings of the 54th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)

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Identification, characterization, and grounding of gradable terms in clinical text
Chaitanya Shivade | Marie-Catherine de Marneffe | Eric Fosler-Lussier | Albert M. Lai
Proceedings of the 15th Workshop on Biomedical Natural Language Processing


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Extending NegEx with Kernel Methods for Negation Detection in Clinical Text
Chaitanya Shivade | Marie-Catherine de Marneffe | Eric Fosler-Lussier | Albert M. Lai
Proceedings of the Second Workshop on Extra-Propositional Aspects of Meaning in Computational Semantics (ExProM 2015)

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Corpus-based discovery of semantic intensity scales
Chaitanya Shivade | Marie-Catherine de Marneffe | Eric Fosler-Lussier | Albert M. Lai
Proceedings of the 2015 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies


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Precise Medication Extraction using Agile Text Mining
Chaitanya Shivade | James Cormack | David Milward
Proceedings of the 5th International Workshop on Health Text Mining and Information Analysis (Louhi)