Introduction
Retrieve and Rank (R&R), if you hadn’t already heard about it, is IBM Watson’s new web service component for information retrieval and question answering. My colleague Chris Madison has summarised how it works in a high level way here.
R&R is based on the Apache SOLR search engine with a machine learning result ranking plugin that learns what answers are most relevant given an input query and presents them in the learnt “relevance” order.
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