PolyLinearRegression.scala : This is an example of Linear Regression done in SparkML and using the class PolynomialExpansion.
NormalEquation.scala : Example of normal equation in SparkML with Scala, using DenseMatrix, DenseVector and RowMatrix
Tools.scala : Various functions used in the classes.
Among them :
Function which converts DataFrame to DenseMatrix
Function which converts DataFrame to DenseVector
Function which converts DataFrame to RDD etc. ...