Inconsistent return values of different ItemSimilarity implementations
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Key: MAHOUT-406
URL: https://issues.apache.org/jira/browse/MAHOUT-406
Project: Mahout
Issue Type: Bug
Components: Collaborative Filtering
Reporter: Sebastian Schelter
org.apache.mahout.cf.taste.impl.similarity.GenericItemSimilarity returns
Double.NaN if you request the similarity for two itemIDs it doesn't know, while
org.apache.mahout.cf.taste.impl.similarity.jdbc.AbstractJDBCItemSimilarity
throws a NoSuchItemException.
They should act consistently (and both return Double.NaN, I guess).
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