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https://issues.apache.org/jira/browse/SPARK-7770?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14876587#comment-14876587
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Joseph K. Bradley commented on SPARK-7770:
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I think it's OK to change the behavior, though we'll need to warn users about
it in the release notes (and maybe play with the default to make sure it seems
reasonable).
> Should GBT validationTol be relative tolerance?
> -----------------------------------------------
>
> Key: SPARK-7770
> URL: https://issues.apache.org/jira/browse/SPARK-7770
> Project: Spark
> Issue Type: Improvement
> Components: ML, MLlib
> Reporter: Joseph K. Bradley
> Assignee: Yanbo Liang
> Priority: Minor
>
> In spark.mllib, GBT validationTol uses absolute tolerance. Relative
> tolerance is arguably easier to set in a meaningful way. Questions:
> * Should we change spark.mllib's validationTol meaning?
> * Should we use relative tolerance in spark.ml's GBT (once we add validation
> support)?
> I would vote for changing both to relative tolerance, where the tolerance is
> relative to the current loss on the training set.
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