IBM Watson Retrieve and Rank API MASTER RECORD

[Editor's Note: The Retrieve and Rank service is no longer supported. Existing instances stopped being supported on 10-03-2018.] The IBM Watson Retrieve and Rank API uses machine learning to enhance information retrieval by looking for "signals" in a given collection of data. Developers can load their data into the service, use known relevant results to train a machine learning model, and then use the model to provide better results to their end users.