brat: a Web-based Tool for NLP-Assisted Text Annotation


We introduce the brat rapid annotation tool (BRAT), an intuitive web-based tool for text annotation supported by Natural Language Processing (NLP) technology. BRAT has been developed for rich structured annotation for a variety of NLP tasks and aims to support manual curation efforts and increase annotator productivity using NLP techniques. We discuss several case studies of real-world annotation projects using pre-release versions of BRAT and present an evaluation of annotation assisted by semantic class disambiguation on a multicategory entity mention annotation task, showing a 15% decrease in total annotation time. BRAT is available under an opensource license from:

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@inproceedings{Stenetorp2012bratAW, title={brat: a Web-based Tool for NLP-Assisted Text Annotation}, author={Pontus Stenetorp and Sampo Pyysalo and Goran Topic and Tomoko Ohta and Sophia Ananiadou and Jun'ichi Tsujii}, booktitle={EACL}, year={2012} }