Joseph K. Bradley created SPARK-9847:
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Summary: ML Params copyValues should copy default values to
default map, not set map
Key: SPARK-9847
URL: https://issues.apache.org/jira/browse/SPARK-9847
Project: Spark
Issue Type: Improvement
Components: ML
Reporter: Joseph K. Bradley
Assignee: Joseph K. Bradley
Priority: Critical
Currently, Params.copyValues copies default parameter values to the paramMap of
the target instance, rather than the defaultParamMap. It should copy to the
defaultParamMap because explicitly setting a parameter can change the semantics.
This issue arose in [SPARK-9789], where 2 params "threshold" and "thresholds"
for LogisticRegression can have mutually exclusive values. If thresholds is
set, then fit() will copy the default value of threshold as well, easily
resulting in inconsistent settings for the 2 params.
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