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New Comparison Tool for Sentiment Analysis APIs
Sentinel Projects 
announced an open-source project for evaluating the accuracy of sentiment analysis REST API services against a manually-coded dataset.
The python-based tool currently supports AIApplied, AlchemyAPI, Bitext, Chatterbox, Datumbox, Lymbix, Repustate, Semantria, Viralheat, and Sentinel's Skyttle. Sentinel plans to add more APIs to the project, which is available on Github: https://github.com/skyttle/sentiment-evaluation.
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