Item similarity in AbstractSimilarity always centers data
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Key: MAHOUT-421
URL: https://issues.apache.org/jira/browse/MAHOUT-421
Project: Mahout
Issue Type: Bug
Components: Collaborative Filtering
Reporter: Emerson Murphy-HIll
I'm trying to use UncenteredCosineSimilarity. When calculating similarity
between users in AbstractSimilarity>>itemSimilarity, there's a condition to
determine whether to center the data:
double result;
if (centerData) {
... get result with centering
} else {
... get result without
}
In AbstractSimilarity>>itemSimilarity, there's no conditional. It *always*
centers the data. Shouldn't it only center the data when centerData is true?
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