Weichen Xu created SPARK-20423:
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Summary: fix MLOR coeffs centering when reg == 0
Key: SPARK-20423
URL: https://issues.apache.org/jira/browse/SPARK-20423
Project: Spark
Issue Type: Improvement
Components: ML
Affects Versions: 2.1.0, 2.0.0
Reporter: Weichen Xu
Priority: Minor
When reg == 0, MLOR has multiple solutions and we need to centralize the coeffs
to get identical result.
BUT current implementation centralize the coefficientMatrix by the global
coeffs means.
In fact the coefficientMatrix should be centralized on each feature index
itself.
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