[SPARK-9005][MLlib]Fix RegressionMetrics computation of explainedVariance#7361

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feynmanliang:SPARK-9005-RegressionMetrics-bugs

Commits on Jul 13, 2015

Fix RegressionMetrics computation of explainedVariance and r2
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Fix RegressionMetrics tests
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Fix RegressionMetrics tests, relax assumption predictor is unbiased
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Style fix
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Fix pyspark tests
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SROwen code review comments
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Commits on Jul 14, 2015

Add explainedVariance formula
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