import org.apache.mahout.math.algorithms.preprocessing.MeanCenter

val A = drmParallelize(dense(
      (1, 1, -2),
      (2, 5, 2),
      (3, 9, 0)), numPartitions = 2)

val scaler: MeanCenterModel = new MeanCenter().fit(A)

val centeredA = scaler.transform(A)