GitHub user yanbohappy opened a pull request:

    https://github.com/apache/spark/pull/2978

    add regression metrics

    Add RegressionMetrics.scala as regression metrics used for evaluation and 
corresponding test case RegressionMetricsSuite.scala.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/yanbohappy/spark regression_metrics

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/spark/pull/2978.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #2978
    
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commit 43bb12b0ce64a70c5d655ad19930b17a7d69ab6e
Author: liangyanbo <liangya...@meituan.com>
Date:   2014-10-28T11:23:09Z

    add regression metrics

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