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[SPARK-11473][ML] R-like summary statistics with intercept for OLS via normal equation solver
Follow up [SPARK-9836](https://issues.apache.org/jira/browse/SPARK-9836), we should also support summary statistics for ```intercept```. Author: Yanbo Liang <ybliang8@gmail.com> Closes #9485 from yanboliang/spark-11473.
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- mllib/src/main/scala/org/apache/spark/ml/optim/WeightedLeastSquares.scala 19 additions, 16 deletions...cala/org/apache/spark/ml/optim/WeightedLeastSquares.scala
- mllib/src/main/scala/org/apache/spark/ml/regression/LinearRegression.scala 13 additions, 9 deletions...ala/org/apache/spark/ml/regression/LinearRegression.scala
- mllib/src/test/scala/org/apache/spark/ml/regression/LinearRegressionSuite.scala 8 additions, 8 deletions...rg/apache/spark/ml/regression/LinearRegressionSuite.scala
- python/pyspark/ml/regression.py 8 additions, 8 deletionspython/pyspark/ml/regression.py
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