In this paper, we introduce YEDDA, a lightweight but efficient open-sourcetool for text span annotation. YEDDA provides a systematic solution for textspan annotation, ranging from collaborative user annotation to administratorevaluation and analysis. It overcomes the low efficiency of traditional textannotation tools by annotating entities through both command line and shortcutkeys, which are configurable with custom labels. YEDDA also gives intelligentrecommendations by training a predictive model using the up-to-date annotatedtext. An administrator client is developed to evaluate annotation quality ofmultiple annotators and generate detailed comparison report for each annotatorpair. YEDDA is developed based on Tkinter and is compatible with all majoroperating systems.
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