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From "Trevor Grant (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAHOUT-1935) Inefficient use of XtX calculation in Ordinary Least Squares
Date Fri, 03 Feb 2017 16:41:51 GMT
Trevor Grant created MAHOUT-1935:
------------------------------------

             Summary: Inefficient use of XtX calculation in Ordinary Least Squares
                 Key: MAHOUT-1935
                 URL: https://issues.apache.org/jira/browse/MAHOUT-1935
             Project: Mahout
          Issue Type: Improvement
    Affects Versions: 0.13.0
            Reporter: Trevor Grant
            Priority: Minor
             Fix For: 0.13.0


In line 59 of OrdinaryLeastSquaresModel we calculate and collect XtX, but then don't bother
to use it (so it is in essence calculated twice).

https://github.com/apache/zeppelin/blob/master/spark/src/main/java/org/apache/zeppelin/spark/SparkInterpreter.java




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