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Posted to dev@mahout.apache.org by "Trevor Grant (JIRA)" <ji...@apache.org> on 2017/02/03 16:41:51 UTC
[jira] [Created] (MAHOUT-1935) Inefficient use of XtX calculation
in Ordinary Least Squares
Trevor Grant created MAHOUT-1935:
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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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