confusionMatrix.scala

  def printConfusionMatrix(labelAndPred: List[(Int,Int)]) = {
    // labelAndPred
    println(" " + (0 until classCount).mkString(" ") + " <- predicted ")
    println((0 until 2*classCount).map(x => "--").mkString)
    for(i <- 0 until classCount) {
      for(j <- 0 until classCount) {
        // i is actual
        // j is classified as
        print(" " + labelAndPred.count{ case (label,pred) => label == i && pred == j })
      }
      println(" | actual=" + i)
    }
  }