[SPARK-3873][MLLIB] Import order fixes.

A slight adjustment to the checker configuration was needed; there is
a handful of warnings still left, but those are because of a bug in
the checker that I'll fix separately (before enabling errors for the
checker, of course).

Author: Marcelo Vanzin <vanzin@cloudera.com>

Closes #10535 from vanzin/SPARK-3873-mllib.

95 files changed, 160 insertions, 169 deletions

diff --git a/mllib/src/main/scala/org/apache/spark/ml/Pipeline.scala b/mllib/src/main/scala/org/apache/spark/ml/Pipeline.scala
index 4b2b3f8489..3acc60d6c6 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/Pipeline.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/Pipeline.scala
@@ -26,11 +26,9 @@ import org.apache.hadoop.fs.Path
 import org.json4s._
 import org.json4s.jackson.JsonMethods._
 
-import org.apache.spark.{SparkContext, Logging}
-import org.apache.spark.annotation.{Since, DeveloperApi, Experimental}
+import org.apache.spark.{Logging, SparkContext}
+import org.apache.spark.annotation.{DeveloperApi, Experimental, Since}
 import org.apache.spark.ml.param.{Param, ParamMap, Params}
-import org.apache.spark.ml.util.MLReader
-import org.apache.spark.ml.util.MLWriter
 import org.apache.spark.ml.util._
 import org.apache.spark.sql.DataFrame
 import org.apache.spark.sql.types.StructType
diff --git a/mllib/src/main/scala/org/apache/spark/ml/Predictor.scala b/mllib/src/main/scala/org/apache/spark/ml/Predictor.scala
index e0dcd427fa..6aacffd4f2 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/Predictor.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/Predictor.scala
@@ -24,9 +24,9 @@ import org.apache.spark.ml.util.SchemaUtils
 import org.apache.spark.mllib.linalg.{Vector, VectorUDT}
 import org.apache.spark.mllib.regression.LabeledPoint
 import org.apache.spark.rdd.RDD
+import org.apache.spark.sql.{DataFrame, Row}
 import org.apache.spark.sql.functions._
 import org.apache.spark.sql.types.{DataType, DoubleType, StructType}
-import org.apache.spark.sql.{DataFrame, Row}
 
 /**
  * (private[ml])  Trait for parameters for prediction (regression and classification).
diff --git a/mllib/src/main/scala/org/apache/spark/ml/ann/Layer.scala b/mllib/src/main/scala/org/apache/spark/ml/ann/Layer.scala
index b5258ff348..d02806a6ea 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/ann/Layer.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/ann/Layer.scala
@@ -17,8 +17,8 @@
 
 package org.apache.spark.ml.ann
 
-import breeze.linalg.{*, DenseMatrix => BDM, DenseVector => BDV, Vector => BV, axpy => Baxpy,
-  sum => Bsum}
+import breeze.linalg.{*, axpy => Baxpy, sum => Bsum, DenseMatrix => BDM, DenseVector => BDV,
+  Vector => BV}
 import breeze.numerics.{log => Blog, sigmoid => Bsigmoid}
 
 import org.apache.spark.mllib.linalg.{Vector, Vectors}
diff --git a/mllib/src/main/scala/org/apache/spark/ml/attribute/attributes.scala b/mllib/src/main/scala/org/apache/spark/ml/attribute/attributes.scala
index a7c10333c0..521d209a8f 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/attribute/attributes.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/attribute/attributes.scala
@@ -20,7 +20,7 @@ package org.apache.spark.ml.attribute
 import scala.annotation.varargs
 
 import org.apache.spark.annotation.DeveloperApi
-import org.apache.spark.sql.types.{DoubleType, NumericType, Metadata, MetadataBuilder, StructField}
+import org.apache.spark.sql.types.{DoubleType, Metadata, MetadataBuilder, NumericType, StructField}
 
 /**
  * :: DeveloperApi ::
diff --git a/mllib/src/main/scala/org/apache/spark/ml/attribute/package.scala b/mllib/src/main/scala/org/apache/spark/ml/attribute/package.scala
index 7ac21d7d56..f6964054db 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/attribute/package.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/attribute/package.scala
@@ -17,8 +17,8 @@
 
 package org.apache.spark.ml
 
-import org.apache.spark.sql.DataFrame
 import org.apache.spark.ml.attribute.{Attribute, AttributeGroup}
+import org.apache.spark.sql.DataFrame
 
 /**
  * ==ML attributes==
diff --git a/mllib/src/main/scala/org/apache/spark/ml/classification/Classifier.scala b/mllib/src/main/scala/org/apache/spark/ml/classification/Classifier.scala
index 45df557a89..8186afc17a 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/classification/Classifier.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/classification/Classifier.scala
@@ -18,7 +18,7 @@
 package org.apache.spark.ml.classification
 
 import org.apache.spark.annotation.DeveloperApi
-import org.apache.spark.ml.{PredictionModel, PredictorParams, Predictor}
+import org.apache.spark.ml.{PredictionModel, Predictor, PredictorParams}
 import org.apache.spark.ml.param.shared.HasRawPredictionCol
 import org.apache.spark.ml.util.SchemaUtils
 import org.apache.spark.mllib.linalg.{Vector, VectorUDT}
@@ -26,7 +26,6 @@ import org.apache.spark.sql.DataFrame
 import org.apache.spark.sql.functions._
 import org.apache.spark.sql.types.{DataType, StructType}
 
-
 /**
  * (private[spark]) Params for classification.
  */
diff --git a/mllib/src/main/scala/org/apache/spark/ml/classification/GBTClassifier.scala b/mllib/src/main/scala/org/apache/spark/ml/classification/GBTClassifier.scala
index cda2bca58c..74bf07c3f1 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/classification/GBTClassifier.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/classification/GBTClassifier.scala
@@ -33,7 +33,7 @@ import org.apache.spark.mllib.tree.configuration.{Algo => OldAlgo}
 import org.apache.spark.mllib.tree.loss.{LogLoss => OldLogLoss, Loss => OldLoss}
 import org.apache.spark.mllib.tree.model.{GradientBoostedTreesModel => OldGBTModel}
 import org.apache.spark.rdd.RDD
-import org.apache.spark.sql.{Row, DataFrame}
+import org.apache.spark.sql.{DataFrame, Row}
 import org.apache.spark.sql.functions._
 import org.apache.spark.sql.types.DoubleType
 
diff --git a/mllib/src/main/scala/org/apache/spark/ml/classification/MultilayerPerceptronClassifier.scala b/mllib/src/main/scala/org/apache/spark/ml/classification/MultilayerPerceptronClassifier.scala
index a691aa005e..719d1076fe 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/classification/MultilayerPerceptronClassifier.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/classification/MultilayerPerceptronClassifier.scala
@@ -20,12 +20,12 @@ package org.apache.spark.ml.classification
 import scala.collection.JavaConverters._
 
 import org.apache.spark.annotation.{Experimental, Since}
-import org.apache.spark.ml.param.shared.{HasTol, HasMaxIter, HasSeed}
-import org.apache.spark.ml.{PredictorParams, PredictionModel, Predictor}
-import org.apache.spark.ml.param.{IntParam, ParamValidators, IntArrayParam, ParamMap}
+import org.apache.spark.ml.{PredictionModel, Predictor, PredictorParams}
+import org.apache.spark.ml.ann.{FeedForwardTopology, FeedForwardTrainer}
+import org.apache.spark.ml.param.{IntArrayParam, IntParam, ParamMap, ParamValidators}
+import org.apache.spark.ml.param.shared.{HasMaxIter, HasSeed, HasTol}
 import org.apache.spark.ml.util.Identifiable
-import org.apache.spark.ml.ann.{FeedForwardTrainer, FeedForwardTopology}
-import org.apache.spark.mllib.linalg.{Vectors, Vector}
+import org.apache.spark.mllib.linalg.{Vector, Vectors}
 import org.apache.spark.mllib.regression.LabeledPoint
 import org.apache.spark.sql.DataFrame
 
diff --git a/mllib/src/main/scala/org/apache/spark/ml/classification/ProbabilisticClassifier.scala b/mllib/src/main/scala/org/apache/spark/ml/classification/ProbabilisticClassifier.scala
index fdd1851ae5..865614aa5c 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/classification/ProbabilisticClassifier.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/classification/ProbabilisticClassifier.scala
@@ -20,7 +20,7 @@ package org.apache.spark.ml.classification
 import org.apache.spark.annotation.DeveloperApi
 import org.apache.spark.ml.param.shared._
 import org.apache.spark.ml.util.SchemaUtils
-import org.apache.spark.mllib.linalg.{DenseVector, Vector, VectorUDT, Vectors}
+import org.apache.spark.mllib.linalg.{DenseVector, Vector, Vectors, VectorUDT}
 import org.apache.spark.sql.DataFrame
 import org.apache.spark.sql.functions._
 import org.apache.spark.sql.types.{DataType, StructType}
diff --git a/mllib/src/main/scala/org/apache/spark/ml/classification/RandomForestClassifier.scala b/mllib/src/main/scala/org/apache/spark/ml/classification/RandomForestClassifier.scala
index d6d85ad253..f7d662df2f 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/classification/RandomForestClassifier.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/classification/RandomForestClassifier.scala
@@ -18,11 +18,11 @@
 package org.apache.spark.ml.classification
 
 import org.apache.spark.annotation.{Experimental, Since}
-import org.apache.spark.ml.tree.impl.RandomForest
 import org.apache.spark.ml.param.ParamMap
 import org.apache.spark.ml.tree.{DecisionTreeModel, RandomForestParams, TreeClassifierParams, TreeEnsembleModel}
+import org.apache.spark.ml.tree.impl.RandomForest
 import org.apache.spark.ml.util.{Identifiable, MetadataUtils}
-import org.apache.spark.mllib.linalg.{SparseVector, DenseVector, Vector, Vectors}
+import org.apache.spark.mllib.linalg.{DenseVector, SparseVector, Vector, Vectors}
 import org.apache.spark.mllib.regression.LabeledPoint
 import org.apache.spark.mllib.tree.configuration.{Algo => OldAlgo}
 import org.apache.spark.mllib.tree.model.{RandomForestModel => OldRandomForestModel}
diff --git a/mllib/src/main/scala/org/apache/spark/ml/clustering/KMeans.scala b/mllib/src/main/scala/org/apache/spark/ml/clustering/KMeans.scala
index 71e9684975..6e5abb29ff 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/clustering/KMeans.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/clustering/KMeans.scala
@@ -20,15 +20,15 @@ package org.apache.spark.ml.clustering
 import org.apache.hadoop.fs.Path
 
 import org.apache.spark.annotation.{Experimental, Since}
-import org.apache.spark.ml.param.shared._
+import org.apache.spark.ml.{Estimator, Model}
 import org.apache.spark.ml.param.{IntParam, Param, ParamMap, Params}
+import org.apache.spark.ml.param.shared._
 import org.apache.spark.ml.util._
-import org.apache.spark.ml.{Estimator, Model}
 import org.apache.spark.mllib.clustering.{KMeans => MLlibKMeans, KMeansModel => MLlibKMeansModel}
 import org.apache.spark.mllib.linalg.{Vector, VectorUDT}
+import org.apache.spark.sql.{DataFrame, Row}
 import org.apache.spark.sql.functions.{col, udf}
 import org.apache.spark.sql.types.{IntegerType, StructType}
-import org.apache.spark.sql.{DataFrame, Row}
 
 /**
  * Common params for KMeans and KMeansModel
diff --git a/mllib/src/main/scala/org/apache/spark/ml/clustering/LDA.scala b/mllib/src/main/scala/org/apache/spark/ml/clustering/LDA.scala
index 830510b169..af0b3e1835 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/clustering/LDA.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/clustering/LDA.scala
@@ -18,19 +18,20 @@
 package org.apache.spark.ml.clustering
 
 import org.apache.hadoop.fs.Path
+
 import org.apache.spark.Logging
 import org.apache.spark.annotation.{Experimental, Since}
 import org.apache.spark.ml.{Estimator, Model}
-import org.apache.spark.ml.param.shared.{HasCheckpointInterval, HasFeaturesCol, HasSeed, HasMaxIter}
 import org.apache.spark.ml.param._
+import org.apache.spark.ml.param.shared.{HasCheckpointInterval, HasFeaturesCol, HasMaxIter, HasSeed}
 import org.apache.spark.ml.util._
 import org.apache.spark.mllib.clustering.{DistributedLDAModel => OldDistributedLDAModel,
     EMLDAOptimizer => OldEMLDAOptimizer, LDA => OldLDA, LDAModel => OldLDAModel,
     LDAOptimizer => OldLDAOptimizer, LocalLDAModel => OldLocalLDAModel,
     OnlineLDAOptimizer => OldOnlineLDAOptimizer}
-import org.apache.spark.mllib.linalg.{VectorUDT, Vectors, Matrix, Vector}
+import org.apache.spark.mllib.linalg.{Matrix, Vector, Vectors, VectorUDT}
 import org.apache.spark.rdd.RDD
-import org.apache.spark.sql.{SQLContext, DataFrame, Row}
+import org.apache.spark.sql.{DataFrame, Row, SQLContext}
 import org.apache.spark.sql.functions.{col, monotonicallyIncreasingId, udf}
 import org.apache.spark.sql.types.StructType
 
diff --git a/mllib/src/main/scala/org/apache/spark/ml/evaluation/MulticlassClassificationEvaluator.scala b/mllib/src/main/scala/org/apache/spark/ml/evaluation/MulticlassClassificationEvaluator.scala
index c44db0ec59..a921153b94 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/evaluation/MulticlassClassificationEvaluator.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/evaluation/MulticlassClassificationEvaluator.scala
@@ -18,11 +18,11 @@
 package org.apache.spark.ml.evaluation
 
 import org.apache.spark.annotation.{Experimental, Since}
-import org.apache.spark.ml.param.{ParamMap, ParamValidators, Param}
+import org.apache.spark.ml.param.{Param, ParamMap, ParamValidators}
 import org.apache.spark.ml.param.shared.{HasLabelCol, HasPredictionCol}
-import org.apache.spark.ml.util.{DefaultParamsReadable, DefaultParamsWritable, SchemaUtils, Identifiable}
+import org.apache.spark.ml.util.{DefaultParamsReadable, DefaultParamsWritable, Identifiable, SchemaUtils}
 import org.apache.spark.mllib.evaluation.MulticlassMetrics
-import org.apache.spark.sql.{Row, DataFrame}
+import org.apache.spark.sql.{DataFrame, Row}
 import org.apache.spark.sql.types.DoubleType
 
 /**
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/Binarizer.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/Binarizer.scala
index 63c0658148..5b17d3483b 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/Binarizer.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/Binarizer.scala
@@ -17,7 +17,7 @@
 
 package org.apache.spark.ml.feature
 
-import org.apache.spark.annotation.{Since, Experimental}
+import org.apache.spark.annotation.{Experimental, Since}
 import org.apache.spark.ml.Transformer
 import org.apache.spark.ml.attribute.BinaryAttribute
 import org.apache.spark.ml.param._
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/Bucketizer.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/Bucketizer.scala
index 324353a96a..33abc7c99d 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/Bucketizer.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/Bucketizer.scala
@@ -20,7 +20,7 @@ package org.apache.spark.ml.feature
 import java.{util => ju}
 
 import org.apache.spark.SparkException
-import org.apache.spark.annotation.{Since, Experimental}
+import org.apache.spark.annotation.{Experimental, Since}
 import org.apache.spark.ml.Model
 import org.apache.spark.ml.attribute.NominalAttribute
 import org.apache.spark.ml.param._
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/CountVectorizer.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/CountVectorizer.scala
index b9e2144c0a..1268c87908 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/CountVectorizer.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/CountVectorizer.scala
@@ -24,7 +24,7 @@ import org.apache.spark.ml.{Estimator, Model}
 import org.apache.spark.ml.param._
 import org.apache.spark.ml.param.shared.{HasInputCol, HasOutputCol}
 import org.apache.spark.ml.util._
-import org.apache.spark.mllib.linalg.{VectorUDT, Vectors}
+import org.apache.spark.mllib.linalg.{Vectors, VectorUDT}
 import org.apache.spark.rdd.RDD
 import org.apache.spark.sql.DataFrame
 import org.apache.spark.sql.functions._
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/DCT.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/DCT.scala
index 6bed72164a..a6f878151d 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/DCT.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/DCT.scala
@@ -19,11 +19,11 @@ package org.apache.spark.ml.feature
 
 import edu.emory.mathcs.jtransforms.dct._
 
-import org.apache.spark.annotation.{Since, Experimental}
+import org.apache.spark.annotation.{Experimental, Since}
 import org.apache.spark.ml.UnaryTransformer
 import org.apache.spark.ml.param.BooleanParam
 import org.apache.spark.ml.util._
-import org.apache.spark.mllib.linalg.{Vector, VectorUDT, Vectors}
+import org.apache.spark.mllib.linalg.{Vector, Vectors, VectorUDT}
 import org.apache.spark.sql.types.DataType
 
 /**
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/ElementwiseProduct.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/ElementwiseProduct.scala
index a359cb8f37..07a12df320 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/ElementwiseProduct.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/ElementwiseProduct.scala
@@ -19,7 +19,7 @@ package org.apache.spark.ml.feature
 
 import org.apache.spark.annotation.Experimental
 import org.apache.spark.ml.UnaryTransformer
-import org.apache.spark.ml.param.{ParamMap, Param}
+import org.apache.spark.ml.param.{Param, ParamMap}
 import org.apache.spark.ml.util.Identifiable
 import org.apache.spark.mllib.feature
 import org.apache.spark.mllib.linalg.{Vector, VectorUDT}
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/HashingTF.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/HashingTF.scala
index 9e15835429..61a78d73c4 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/HashingTF.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/HashingTF.scala
@@ -17,7 +17,7 @@
 
 package org.apache.spark.ml.feature
 
-import org.apache.spark.annotation.{Since, Experimental}
+import org.apache.spark.annotation.{Experimental, Since}
 import org.apache.spark.ml.Transformer
 import org.apache.spark.ml.attribute.AttributeGroup
 import org.apache.spark.ml.param.{IntParam, ParamMap, ParamValidators}
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/Interaction.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/Interaction.scala
index 2181119f04..7d2a1da990 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/Interaction.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/Interaction.scala
@@ -20,13 +20,13 @@ package org.apache.spark.ml.feature
 import scala.collection.mutable.ArrayBuilder
 
 import org.apache.spark.SparkException
-import org.apache.spark.annotation.{Since, Experimental}
+import org.apache.spark.annotation.{Experimental, Since}
 import org.apache.spark.ml.attribute._
 import org.apache.spark.ml.param._
 import org.apache.spark.ml.param.shared._
 import org.apache.spark.ml.util._
 import org.apache.spark.ml.Transformer
-import org.apache.spark.mllib.linalg.{Vector, VectorUDT, Vectors}
+import org.apache.spark.mllib.linalg.{Vector, Vectors, VectorUDT}
 import org.apache.spark.sql.{DataFrame, Row}
 import org.apache.spark.sql.functions._
 import org.apache.spark.sql.types._
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/MinMaxScaler.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/MinMaxScaler.scala
index c2866f5ece..559a025265 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/MinMaxScaler.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/MinMaxScaler.scala
@@ -17,7 +17,6 @@
 
 package org.apache.spark.ml.feature
 
-
 import org.apache.hadoop.fs.Path
 
 import org.apache.spark.annotation.{Experimental, Since}
@@ -25,7 +24,7 @@ import org.apache.spark.ml.{Estimator, Model}
 import org.apache.spark.ml.param.{DoubleParam, ParamMap, Params}
 import org.apache.spark.ml.param.shared.{HasInputCol, HasOutputCol}
 import org.apache.spark.ml.util._
-import org.apache.spark.mllib.linalg.{Vector, VectorUDT, Vectors}
+import org.apache.spark.mllib.linalg.{Vector, Vectors, VectorUDT}
 import org.apache.spark.mllib.stat.Statistics
 import org.apache.spark.sql._
 import org.apache.spark.sql.functions._
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/NGram.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/NGram.scala
index 65414ecbef..f8bc7e3f0c 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/NGram.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/NGram.scala
@@ -17,7 +17,7 @@
 
 package org.apache.spark.ml.feature
 
-import org.apache.spark.annotation.{Since, Experimental}
+import org.apache.spark.annotation.{Experimental, Since}
 import org.apache.spark.ml.UnaryTransformer
 import org.apache.spark.ml.param._
 import org.apache.spark.ml.util._
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/Normalizer.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/Normalizer.scala
index c2d514fd96..a603b3f833 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/Normalizer.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/Normalizer.scala
@@ -17,7 +17,7 @@
 
 package org.apache.spark.ml.feature
 
-import org.apache.spark.annotation.{Since, Experimental}
+import org.apache.spark.annotation.{Experimental, Since}
 import org.apache.spark.ml.UnaryTransformer
 import org.apache.spark.ml.param.{DoubleParam, ParamValidators}
 import org.apache.spark.ml.util._
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/OneHotEncoder.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/OneHotEncoder.scala
index d70164eaf0..c01e29af47 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/OneHotEncoder.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/OneHotEncoder.scala
@@ -17,7 +17,7 @@
 
 package org.apache.spark.ml.feature
 
-import org.apache.spark.annotation.{Since, Experimental}
+import org.apache.spark.annotation.{Experimental, Since}
 import org.apache.spark.ml.Transformer
 import org.apache.spark.ml.attribute._
 import org.apache.spark.ml.param._
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/PolynomialExpansion.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/PolynomialExpansion.scala
index 08610593fa..42b26c8ee8 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/PolynomialExpansion.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/PolynomialExpansion.scala
@@ -19,9 +19,9 @@ package org.apache.spark.ml.feature
 
 import scala.collection.mutable
 
-import org.apache.spark.annotation.{Since, Experimental}
+import org.apache.spark.annotation.{Experimental, Since}
 import org.apache.spark.ml.UnaryTransformer
-import org.apache.spark.ml.param.{ParamMap, IntParam, ParamValidators}
+import org.apache.spark.ml.param.{IntParam, ParamMap, ParamValidators}
 import org.apache.spark.ml.util._
 import org.apache.spark.mllib.linalg._
 import org.apache.spark.sql.types.DataType
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/QuantileDiscretizer.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/QuantileDiscretizer.scala
index 7bf67c6325..39de8461dc 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/QuantileDiscretizer.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/QuantileDiscretizer.scala
@@ -20,14 +20,14 @@ package org.apache.spark.ml.feature
 import scala.collection.mutable
 
 import org.apache.spark.Logging
-import org.apache.spark.annotation.{Since, Experimental}
+import org.apache.spark.annotation.{Experimental, Since}
 import org.apache.spark.ml._
 import org.apache.spark.ml.attribute.NominalAttribute
-import org.apache.spark.ml.param.shared.{HasInputCol, HasOutputCol}
 import org.apache.spark.ml.param.{IntParam, _}
+import org.apache.spark.ml.param.shared.{HasInputCol, HasOutputCol}
 import org.apache.spark.ml.util._
-import org.apache.spark.sql.types.{DoubleType, StructType}
 import org.apache.spark.sql.{DataFrame, Row}
+import org.apache.spark.sql.types.{DoubleType, StructType}
 import org.apache.spark.util.random.XORShiftRandom
 
 /**
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/RFormula.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/RFormula.scala
index 5c43a41bee..2b578c2a95 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/RFormula.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/RFormula.scala
@@ -21,8 +21,8 @@ import scala.collection.mutable
 import scala.collection.mutable.ArrayBuffer
 
 import org.apache.spark.annotation.Experimental
-import org.apache.spark.ml.attribute.AttributeGroup
 import org.apache.spark.ml.{Estimator, Model, Pipeline, PipelineModel, PipelineStage, Transformer}
+import org.apache.spark.ml.attribute.AttributeGroup
 import org.apache.spark.ml.param.{Param, ParamMap}
 import org.apache.spark.ml.param.shared.{HasFeaturesCol, HasLabelCol}
 import org.apache.spark.ml.util.Identifiable
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/SQLTransformer.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/SQLTransformer.scala
index c09f4d076c..e0ca45b9a6 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/SQLTransformer.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/SQLTransformer.scala
@@ -18,11 +18,11 @@
 package org.apache.spark.ml.feature
 
 import org.apache.spark.SparkContext
-import org.apache.spark.annotation.{Since, Experimental}
-import org.apache.spark.ml.param.{ParamMap, Param}
+import org.apache.spark.annotation.{Experimental, Since}
+import org.apache.spark.ml.param.{Param, ParamMap}
 import org.apache.spark.ml.Transformer
 import org.apache.spark.ml.util._
-import org.apache.spark.sql.{SQLContext, DataFrame, Row}
+import org.apache.spark.sql.{DataFrame, Row, SQLContext}
 import org.apache.spark.sql.types.StructType
 
 /**
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/StopWordsRemover.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/StopWordsRemover.scala
index 318808596d..5d6936dce2 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/StopWordsRemover.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/StopWordsRemover.scala
@@ -17,7 +17,7 @@
 
 package org.apache.spark.ml.feature
 
-import org.apache.spark.annotation.{Since, Experimental}
+import org.apache.spark.annotation.{Experimental, Since}
 import org.apache.spark.ml.Transformer
 import org.apache.spark.ml.param.{BooleanParam, ParamMap, StringArrayParam}
 import org.apache.spark.ml.param.shared.{HasInputCol, HasOutputCol}
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/Tokenizer.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/Tokenizer.scala
index 8ad7bbedaa..8456a0e915 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/Tokenizer.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/Tokenizer.scala
@@ -17,7 +17,7 @@
 
 package org.apache.spark.ml.feature
 
-import org.apache.spark.annotation.{Since, Experimental}
+import org.apache.spark.annotation.{Experimental, Since}
 import org.apache.spark.ml.UnaryTransformer
 import org.apache.spark.ml.param._
 import org.apache.spark.ml.util._
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/VectorAssembler.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/VectorAssembler.scala
index 801096fed2..e9d1b57b91 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/VectorAssembler.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/VectorAssembler.scala
@@ -20,13 +20,13 @@ package org.apache.spark.ml.feature
 import scala.collection.mutable.ArrayBuilder
 
 import org.apache.spark.SparkException
-import org.apache.spark.annotation.{Since, Experimental}
+import org.apache.spark.annotation.{Experimental, Since}
 import org.apache.spark.ml.Transformer
 import org.apache.spark.ml.attribute.{Attribute, AttributeGroup, NumericAttribute, UnresolvedAttribute}
 import org.apache.spark.ml.param.ParamMap
 import org.apache.spark.ml.param.shared._
 import org.apache.spark.ml.util._
-import org.apache.spark.mllib.linalg.{Vector, VectorUDT, Vectors}
+import org.apache.spark.mllib.linalg.{Vector, Vectors, VectorUDT}
 import org.apache.spark.sql.{DataFrame, Row}
 import org.apache.spark.sql.functions._
 import org.apache.spark.sql.types._
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/VectorSlicer.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/VectorSlicer.scala
index 5410a50bc2..4813d8a5b5 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/VectorSlicer.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/VectorSlicer.scala
@@ -17,11 +17,11 @@
 
 package org.apache.spark.ml.feature
 
-import org.apache.spark.annotation.{Since, Experimental}
+import org.apache.spark.annotation.{Experimental, Since}
 import org.apache.spark.ml.Transformer
 import org.apache.spark.ml.attribute.{Attribute, AttributeGroup}
-import org.apache.spark.ml.param.shared.{HasInputCol, HasOutputCol}
 import org.apache.spark.ml.param.{IntArrayParam, ParamMap, StringArrayParam}
+import org.apache.spark.ml.param.shared.{HasInputCol, HasOutputCol}
 import org.apache.spark.ml.util._
 import org.apache.spark.mllib.linalg._
 import org.apache.spark.sql.DataFrame
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/Word2Vec.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/Word2Vec.scala
index f105a983a3..59c34cd170 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/Word2Vec.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/Word2Vec.scala
@@ -26,7 +26,7 @@ import org.apache.spark.ml.param._
 import org.apache.spark.ml.param.shared._
 import org.apache.spark.ml.util._
 import org.apache.spark.mllib.feature
-import org.apache.spark.mllib.linalg.{BLAS, Vector, VectorUDT, Vectors}
+import org.apache.spark.mllib.linalg.{BLAS, Vector, Vectors, VectorUDT}
 import org.apache.spark.sql.{DataFrame, Row, SQLContext}
 import org.apache.spark.sql.functions._
 import org.apache.spark.sql.types._
diff --git a/mllib/src/main/scala/org/apache/spark/ml/r/SparkRWrappers.scala b/mllib/src/main/scala/org/apache/spark/ml/r/SparkRWrappers.scala
index 4d82b90bfd..551e75dc0a 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/r/SparkRWrappers.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/r/SparkRWrappers.scala
@@ -17,11 +17,11 @@
 
 package org.apache.spark.ml.api.r
 
+import org.apache.spark.ml.{Pipeline, PipelineModel}
 import org.apache.spark.ml.attribute._
-import org.apache.spark.ml.feature.RFormula
 import org.apache.spark.ml.classification.{LogisticRegression, LogisticRegressionModel}
+import org.apache.spark.ml.feature.RFormula
 import org.apache.spark.ml.regression.{LinearRegression, LinearRegressionModel}
-import org.apache.spark.ml.{Pipeline, PipelineModel}
 import org.apache.spark.sql.DataFrame
 
 private[r] object SparkRWrappers {
diff --git a/mllib/src/main/scala/org/apache/spark/ml/recommendation/ALS.scala b/mllib/src/main/scala/org/apache/spark/ml/recommendation/ALS.scala
index b798aa1fab..14a28b8d5b 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/recommendation/ALS.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/recommendation/ALS.scala
@@ -31,7 +31,7 @@ import org.json4s.DefaultFormats
 import org.json4s.JsonDSL._
 
 import org.apache.spark.{Logging, Partitioner}
-import org.apache.spark.annotation.{Since, DeveloperApi, Experimental}
+import org.apache.spark.annotation.{DeveloperApi, Experimental, Since}
 import org.apache.spark.ml.{Estimator, Model}
 import org.apache.spark.ml.param._
 import org.apache.spark.ml.param.shared._
diff --git a/mllib/src/main/scala/org/apache/spark/ml/regression/AFTSurvivalRegression.scala b/mllib/src/main/scala/org/apache/spark/ml/regression/AFTSurvivalRegression.scala
index aedfb48058..3787ca45d5 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/regression/AFTSurvivalRegression.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/regression/AFTSurvivalRegression.scala
@@ -23,18 +23,18 @@ import breeze.linalg.{DenseVector => BDV}
 import breeze.optimize.{CachedDiffFunction, DiffFunction, LBFGS => BreezeLBFGS}
 import org.apache.hadoop.fs.Path
 
+import org.apache.spark.{Logging, SparkException}
 import org.apache.spark.annotation.{Experimental, Since}
+import org.apache.spark.ml.{Estimator, Model}
 import org.apache.spark.ml.param._
 import org.apache.spark.ml.param.shared._
 import org.apache.spark.ml.util._
-import org.apache.spark.ml.{Estimator, Model}
-import org.apache.spark.mllib.linalg.{BLAS, Vector, VectorUDT, Vectors}
+import org.apache.spark.mllib.linalg.{BLAS, Vector, Vectors, VectorUDT}
 import org.apache.spark.rdd.RDD
+import org.apache.spark.sql.{DataFrame, Row}
 import org.apache.spark.sql.functions._
 import org.apache.spark.sql.types.{DoubleType, StructType}
-import org.apache.spark.sql.{DataFrame, Row}
 import org.apache.spark.storage.StorageLevel
-import org.apache.spark.{Logging, SparkException}
 
 /**
  * Params for accelerated failure time (AFT) regression.
diff --git a/mllib/src/main/scala/org/apache/spark/ml/regression/IsotonicRegression.scala b/mllib/src/main/scala/org/apache/spark/ml/regression/IsotonicRegression.scala
index bbb1c7ac0a..e8d361b1a2 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/regression/IsotonicRegression.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/regression/IsotonicRegression.scala
@@ -21,18 +21,18 @@ import org.apache.hadoop.fs.Path
 
 import org.apache.spark.Logging
 import org.apache.spark.annotation.{Experimental, Since}
+import org.apache.spark.ml.{Estimator, Model}
 import org.apache.spark.ml.param._
 import org.apache.spark.ml.param.shared._
 import org.apache.spark.ml.regression.IsotonicRegressionModel.IsotonicRegressionModelWriter
 import org.apache.spark.ml.util._
-import org.apache.spark.ml.{Estimator, Model}
-import org.apache.spark.mllib.linalg.{Vector, VectorUDT, Vectors}
+import org.apache.spark.mllib.linalg.{Vector, Vectors, VectorUDT}
 import org.apache.spark.mllib.regression.{IsotonicRegression => MLlibIsotonicRegression}
 import org.apache.spark.mllib.regression.{IsotonicRegressionModel => MLlibIsotonicRegressionModel}
 import org.apache.spark.rdd.RDD
+import org.apache.spark.sql.{DataFrame, Row}
 import org.apache.spark.sql.functions.{col, lit, udf}
 import org.apache.spark.sql.types.{DoubleType, StructType}
-import org.apache.spark.sql.{DataFrame, Row}
 import org.apache.spark.storage.StorageLevel
 
 /**
diff --git a/mllib/src/main/scala/org/apache/spark/ml/regression/LinearRegression.scala b/mllib/src/main/scala/org/apache/spark/ml/regression/LinearRegression.scala
index 5e5850963e..dee26337dc 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/regression/LinearRegression.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/regression/LinearRegression.scala
@@ -25,9 +25,9 @@ import breeze.stats.distributions.StudentsT
 import org.apache.hadoop.fs.Path
 
 import org.apache.spark.{Logging, SparkException}
+import org.apache.spark.annotation.{Experimental, Since}
 import org.apache.spark.ml.feature.Instance
 import org.apache.spark.ml.optim.WeightedLeastSquares
-import org.apache.spark.annotation.{Experimental, Since}
 import org.apache.spark.ml.PredictorParams
 import org.apache.spark.ml.param.ParamMap
 import org.apache.spark.ml.param.shared._
diff --git a/mllib/src/main/scala/org/apache/spark/ml/regression/Regressor.scala b/mllib/src/main/scala/org/apache/spark/ml/regression/Regressor.scala
index c72ef29680..cf189e8e96 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/regression/Regressor.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/regression/Regressor.scala
@@ -18,7 +18,7 @@
 package org.apache.spark.ml.regression
 
 import org.apache.spark.annotation.DeveloperApi
-import org.apache.spark.ml.{PredictionModel, PredictorParams, Predictor}
+import org.apache.spark.ml.{PredictionModel, Predictor, PredictorParams}
 
 
 /**
diff --git a/mllib/src/main/scala/org/apache/spark/ml/source/libsvm/LibSVMRelation.scala b/mllib/src/main/scala/org/apache/spark/ml/source/libsvm/LibSVMRelation.scala
index 11b9815ecc..1bed542c40 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/source/libsvm/LibSVMRelation.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/source/libsvm/LibSVMRelation.scala
@@ -24,7 +24,7 @@ import org.apache.spark.annotation.Since
 import org.apache.spark.mllib.linalg.{Vector, VectorUDT}
 import org.apache.spark.mllib.util.MLUtils
 import org.apache.spark.rdd.RDD
-import org.apache.spark.sql.{DataFrameReader, DataFrame, Row, SQLContext}
+import org.apache.spark.sql.{DataFrame, DataFrameReader, Row, SQLContext}
 import org.apache.spark.sql.sources._
 import org.apache.spark.sql.types.{DoubleType, StructField, StructType}
 
diff --git a/mllib/src/main/scala/org/apache/spark/ml/tree/Node.scala b/mllib/src/main/scala/org/apache/spark/ml/tree/Node.scala
index 9cfd466294..6507a8ad7c 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/tree/Node.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/tree/Node.scala
@@ -20,8 +20,8 @@ package org.apache.spark.ml.tree
 import org.apache.spark.annotation.DeveloperApi
 import org.apache.spark.mllib.linalg.Vector
 import org.apache.spark.mllib.tree.impurity.ImpurityCalculator
-import org.apache.spark.mllib.tree.model.{InformationGainStats => OldInformationGainStats,
-  Node => OldNode, Predict => OldPredict, ImpurityStats}
+import org.apache.spark.mllib.tree.model.{ImpurityStats,
+  InformationGainStats => OldInformationGainStats, Node => OldNode, Predict => OldPredict}
 
 /**
  * :: DeveloperApi ::
diff --git a/mllib/src/main/scala/org/apache/spark/ml/tree/impl/NodeIdCache.scala b/mllib/src/main/scala/org/apache/spark/ml/tree/impl/NodeIdCache.scala
index 1ee01131d6..172ea52820 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/tree/impl/NodeIdCache.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/tree/impl/NodeIdCache.scala
@@ -21,7 +21,7 @@ import java.io.IOException
 
 import scala.collection.mutable
 
-import org.apache.hadoop.fs.{Path, FileSystem}
+import org.apache.hadoop.fs.{FileSystem, Path}
 
 import org.apache.spark.Logging
 import org.apache.spark.annotation.DeveloperApi
diff --git a/mllib/src/main/scala/org/apache/spark/ml/tree/impl/RandomForest.scala b/mllib/src/main/scala/org/apache/spark/ml/tree/impl/RandomForest.scala
index 4a3b12d144..6e87302c77 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/tree/impl/RandomForest.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/tree/impl/RandomForest.scala
@@ -26,10 +26,10 @@ import org.apache.spark.Logging
 import org.apache.spark.ml.classification.DecisionTreeClassificationModel
 import org.apache.spark.ml.regression.DecisionTreeRegressionModel
 import org.apache.spark.ml.tree._
-import org.apache.spark.mllib.linalg.{Vectors, Vector}
+import org.apache.spark.mllib.linalg.{Vector, Vectors}
 import org.apache.spark.mllib.regression.LabeledPoint
 import org.apache.spark.mllib.tree.configuration.{Algo => OldAlgo, Strategy => OldStrategy}
-import org.apache.spark.mllib.tree.impl.{BaggedPoint, DTStatsAggregator, DecisionTreeMetadata,
+import org.apache.spark.mllib.tree.impl.{BaggedPoint, DecisionTreeMetadata, DTStatsAggregator,
   TimeTracker}
 import org.apache.spark.mllib.tree.impurity.ImpurityCalculator
 import org.apache.spark.mllib.tree.model.ImpurityStats
diff --git a/mllib/src/main/scala/org/apache/spark/ml/tree/treeModels.scala b/mllib/src/main/scala/org/apache/spark/ml/tree/treeModels.scala
index b77191156f..40ed95773e 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/tree/treeModels.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/tree/treeModels.scala
@@ -17,7 +17,7 @@
 
 package org.apache.spark.ml.tree
 
-import org.apache.spark.mllib.linalg.{Vectors, Vector}
+import org.apache.spark.mllib.linalg.{Vector, Vectors}
 
 /**
  * Abstraction for Decision Tree models.
diff --git a/mllib/src/main/scala/org/apache/spark/ml/tuning/CrossValidator.scala b/mllib/src/main/scala/org/apache/spark/ml/tuning/CrossValidator.scala
index 40f8857fc5..477675cad1 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/tuning/CrossValidator.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/tuning/CrossValidator.scala
@@ -19,8 +19,8 @@ package org.apache.spark.ml.tuning
 
 import com.github.fommil.netlib.F2jBLAS
 import org.apache.hadoop.fs.Path
-import org.json4s.jackson.JsonMethods._
 import org.json4s.{DefaultFormats, JObject}
+import org.json4s.jackson.JsonMethods._
 
 import org.apache.spark.{Logging, SparkContext}
 import org.apache.spark.annotation.{Experimental, Since}
diff --git a/mllib/src/main/scala/org/apache/spark/ml/tuning/TrainValidationSplit.scala b/mllib/src/main/scala/org/apache/spark/ml/tuning/TrainValidationSplit.scala
index adf0630204..f346ea655a 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/tuning/TrainValidationSplit.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/tuning/TrainValidationSplit.scala
@@ -19,8 +19,8 @@ package org.apache.spark.ml.tuning
 
 import org.apache.spark.Logging
 import org.apache.spark.annotation.{Experimental, Since}
-import org.apache.spark.ml.evaluation.Evaluator
 import org.apache.spark.ml.{Estimator, Model}
+import org.apache.spark.ml.evaluation.Evaluator
 import org.apache.spark.ml.param.{DoubleParam, ParamMap, ParamValidators}
 import org.apache.spark.ml.util.Identifiable
 import org.apache.spark.sql.DataFrame
diff --git a/mllib/src/main/scala/org/apache/spark/ml/tuning/ValidatorParams.scala b/mllib/src/main/scala/org/apache/spark/ml/tuning/ValidatorParams.scala
index 8897ab0825..553f254172 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/tuning/ValidatorParams.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/tuning/ValidatorParams.scala
@@ -20,7 +20,7 @@ package org.apache.spark.ml.tuning
 import org.apache.spark.annotation.DeveloperApi
 import org.apache.spark.ml.Estimator
 import org.apache.spark.ml.evaluation.Evaluator
-import org.apache.spark.ml.param.{ParamMap, Param, Params}
+import org.apache.spark.ml.param.{Param, ParamMap, Params}
 
 /**
  * :: DeveloperApi ::
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/api/python/PowerIterationClusteringModelWrapper.scala b/mllib/src/main/scala/org/apache/spark/mllib/api/python/PowerIterationClusteringModelWrapper.scala
index bc6041b221..6530870b83 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/api/python/PowerIterationClusteringModelWrapper.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/api/python/PowerIterationClusteringModelWrapper.scala
@@ -17,8 +17,8 @@
 
 package org.apache.spark.mllib.api.python
 
-import org.apache.spark.rdd.RDD
 import org.apache.spark.mllib.clustering.PowerIterationClusteringModel
+import org.apache.spark.rdd.RDD
 
 /**
  * A Wrapper of PowerIterationClusteringModel to provide helper method for Python
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/api/python/PythonMLLibAPI.scala b/mllib/src/main/scala/org/apache/spark/mllib/api/python/PythonMLLibAPI.scala
index f6826ddbfa..061db56c74 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/api/python/PythonMLLibAPI.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/api/python/PythonMLLibAPI.scala
@@ -42,18 +42,17 @@ import org.apache.spark.mllib.optimization._
 import org.apache.spark.mllib.random.{RandomRDDs => RG}
 import org.apache.spark.mllib.recommendation._
 import org.apache.spark.mllib.regression._
+import org.apache.spark.mllib.stat.{
+  KernelDensity, MultivariateStatisticalSummary, Statistics}
 import org.apache.spark.mllib.stat.correlation.CorrelationNames
 import org.apache.spark.mllib.stat.distribution.MultivariateGaussian
 import org.apache.spark.mllib.stat.test.{ChiSqTestResult, KolmogorovSmirnovTestResult}
-import org.apache.spark.mllib.stat.{
-  KernelDensity, MultivariateStatisticalSummary, Statistics}
+import org.apache.spark.mllib.tree.{DecisionTree, GradientBoostedTrees, RandomForest}
 import org.apache.spark.mllib.tree.configuration.{Algo, BoostingStrategy, Strategy}
 import org.apache.spark.mllib.tree.impurity._
 import org.apache.spark.mllib.tree.loss.Losses
 import org.apache.spark.mllib.tree.model.{DecisionTreeModel, GradientBoostedTreesModel, RandomForestModel}
-import org.apache.spark.mllib.tree.{DecisionTree, GradientBoostedTrees, RandomForest}
-import org.apache.spark.mllib.util.MLUtils
-import org.apache.spark.mllib.util.LinearDataGenerator
+import org.apache.spark.mllib.util.{LinearDataGenerator, MLUtils}
 import org.apache.spark.rdd.RDD
 import org.apache.spark.sql.{DataFrame, Row, SQLContext}
 import org.apache.spark.storage.StorageLevel
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/api/python/Word2VecModelWrapper.scala b/mllib/src/main/scala/org/apache/spark/mllib/api/python/Word2VecModelWrapper.scala
index 0f55980481..55dfd973eb 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/api/python/Word2VecModelWrapper.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/api/python/Word2VecModelWrapper.scala
@@ -18,6 +18,7 @@
 package org.apache.spark.mllib.api.python
 
 import java.util.{ArrayList => JArrayList, List => JList, Map => JMap}
+
 import scala.collection.JavaConverters._
 
 import org.apache.spark.SparkContext
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/classification/LogisticRegression.scala b/mllib/src/main/scala/org/apache/spark/mllib/classification/LogisticRegression.scala
index 2d52abc122..2a7697b5a7 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/classification/LogisticRegression.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/classification/LogisticRegression.scala
@@ -20,12 +20,12 @@ package org.apache.spark.mllib.classification
 import org.apache.spark.SparkContext
 import org.apache.spark.annotation.Since
 import org.apache.spark.mllib.classification.impl.GLMClassificationModel
-import org.apache.spark.mllib.linalg.BLAS.dot
 import org.apache.spark.mllib.linalg.{DenseVector, Vector}
+import org.apache.spark.mllib.linalg.BLAS.dot
 import org.apache.spark.mllib.optimization._
 import org.apache.spark.mllib.pmml.PMMLExportable
 import org.apache.spark.mllib.regression._
-import org.apache.spark.mllib.util.{DataValidators, Saveable, Loader}
+import org.apache.spark.mllib.util.{DataValidators, Loader, Saveable}
 import org.apache.spark.rdd.RDD
 
 
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/clustering/GaussianMixtureModel.scala b/mllib/src/main/scala/org/apache/spark/mllib/clustering/GaussianMixtureModel.scala
index 74d13e4f77..5c9bc62cb0 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/clustering/GaussianMixtureModel.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/clustering/GaussianMixtureModel.scala
@@ -18,7 +18,6 @@
 package org.apache.spark.mllib.clustering
 
 import breeze.linalg.{DenseVector => BreezeVector}
-
 import org.json4s.DefaultFormats
 import org.json4s.JsonDSL._
 import org.json4s.jackson.JsonMethods._
@@ -26,11 +25,11 @@ import org.json4s.jackson.JsonMethods._
 import org.apache.spark.SparkContext
 import org.apache.spark.annotation.Since
 import org.apache.spark.api.java.JavaRDD
-import org.apache.spark.mllib.linalg.{Vector, Matrices, Matrix}
+import org.apache.spark.mllib.linalg.{Matrices, Matrix, Vector}
 import org.apache.spark.mllib.stat.distribution.MultivariateGaussian
-import org.apache.spark.mllib.util.{MLUtils, Loader, Saveable}
+import org.apache.spark.mllib.util.{Loader, MLUtils, Saveable}
 import org.apache.spark.rdd.RDD
-import org.apache.spark.sql.{SQLContext, Row}
+import org.apache.spark.sql.{Row, SQLContext}
 
 /**
  * Multivariate Gaussian Mixture Model (GMM) consisting of k Gaussians, where points
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/clustering/KMeansModel.scala b/mllib/src/main/scala/org/apache/spark/mllib/clustering/KMeansModel.scala
index 91fa9b0d35..26c6235fe5 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/clustering/KMeansModel.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/clustering/KMeansModel.scala
@@ -23,15 +23,14 @@ import org.json4s._
 import org.json4s.JsonDSL._
 import org.json4s.jackson.JsonMethods._
 
+import org.apache.spark.SparkContext
 import org.apache.spark.annotation.Since
 import org.apache.spark.api.java.JavaRDD
 import org.apache.spark.mllib.linalg.Vector
 import org.apache.spark.mllib.pmml.PMMLExportable
 import org.apache.spark.mllib.util.{Loader, Saveable}
 import org.apache.spark.rdd.RDD
-import org.apache.spark.SparkContext
-import org.apache.spark.sql.SQLContext
-import org.apache.spark.sql.Row
+import org.apache.spark.sql.{Row, SQLContext}
 
 /**
  * A clustering model for K-means. Each point belongs to the cluster with the closest center.
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAModel.scala b/mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAModel.scala
index 7384d065a2..2fce3ff641 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAModel.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAModel.scala
@@ -17,7 +17,7 @@
 
 package org.apache.spark.mllib.clustering
 
-import breeze.linalg.{DenseMatrix => BDM, DenseVector => BDV, argmax, argtopk, normalize, sum}
+import breeze.linalg.{argmax, argtopk, normalize, sum, DenseMatrix => BDM, DenseVector => BDV}
 import breeze.numerics.{exp, lgamma}
 import org.apache.hadoop.fs.Path
 import org.json4s.DefaultFormats
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAOptimizer.scala b/mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAOptimizer.scala
index 17c0609800..c19595e6cd 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAOptimizer.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAOptimizer.scala
@@ -19,8 +19,8 @@ package org.apache.spark.mllib.clustering
 
 import java.util.Random
 
-import breeze.linalg.{DenseMatrix => BDM, DenseVector => BDV, all, normalize, sum}
-import breeze.numerics.{trigamma, abs, exp}
+import breeze.linalg.{all, normalize, sum, DenseMatrix => BDM, DenseVector => BDV}
+import breeze.numerics.{abs, exp, trigamma}
 import breeze.stats.distributions.{Gamma, RandBasis}
 
 import org.apache.spark.annotation.{DeveloperApi, Since}
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAUtils.scala b/mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAUtils.scala
index a9ba7b60ba..647d37bd82 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAUtils.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAUtils.scala
@@ -16,7 +16,7 @@
  */
 package org.apache.spark.mllib.clustering
 
-import breeze.linalg.{DenseMatrix => BDM, DenseVector => BDV, max, sum}
+import breeze.linalg.{max, sum, DenseMatrix => BDM, DenseVector => BDV}
 import breeze.numerics._
 
 /**
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/clustering/LocalKMeans.scala b/mllib/src/main/scala/org/apache/spark/mllib/clustering/LocalKMeans.scala
index b2f140e1b1..c9a96c6866 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/clustering/LocalKMeans.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/clustering/LocalKMeans.scala
@@ -20,8 +20,8 @@ package org.apache.spark.mllib.clustering
 import scala.util.Random
 
 import org.apache.spark.Logging
-import org.apache.spark.mllib.linalg.Vectors
 import org.apache.spark.mllib.linalg.BLAS.{axpy, scal}
+import org.apache.spark.mllib.linalg.Vectors
 
 /**
  * An utility object to run K-means locally. This is private to the ML package because it's used
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/clustering/PowerIterationClustering.scala b/mllib/src/main/scala/org/apache/spark/mllib/clustering/PowerIterationClustering.scala
index bb18045059..2ab0920b06 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/clustering/PowerIterationClustering.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/clustering/PowerIterationClustering.scala
@@ -17,10 +17,11 @@
 
 package org.apache.spark.mllib.clustering
 
-import org.json4s.JsonDSL._
 import org.json4s._
+import org.json4s.JsonDSL._
 import org.json4s.jackson.JsonMethods._
 
+import org.apache.spark.{Logging, SparkContext, SparkException}
 import org.apache.spark.annotation.Since
 import org.apache.spark.api.java.JavaRDD
 import org.apache.spark.graphx._
@@ -30,7 +31,6 @@ import org.apache.spark.mllib.util.{Loader, MLUtils, Saveable}
 import org.apache.spark.rdd.RDD
 import org.apache.spark.sql.{Row, SQLContext}
 import org.apache.spark.util.random.XORShiftRandom
-import org.apache.spark.{Logging, SparkContext, SparkException}
 
 /**
  * Model produced by [[PowerIterationClustering]].
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/clustering/StreamingKMeans.scala b/mllib/src/main/scala/org/apache/spark/mllib/clustering/StreamingKMeans.scala
index 80843719f5..79d217e183 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/clustering/StreamingKMeans.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/clustering/StreamingKMeans.scala
@@ -24,7 +24,7 @@ import org.apache.spark.annotation.Since
 import org.apache.spark.api.java.JavaSparkContext._
 import org.apache.spark.mllib.linalg.{BLAS, Vector, Vectors}
 import org.apache.spark.rdd.RDD
-import org.apache.spark.streaming.api.java.{JavaPairDStream, JavaDStream}
+import org.apache.spark.streaming.api.java.{JavaDStream, JavaPairDStream}
 import org.apache.spark.streaming.dstream.DStream
 import org.apache.spark.util.Utils
 import org.apache.spark.util.random.XORShiftRandom
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/evaluation/AreaUnderCurve.scala b/mllib/src/main/scala/org/apache/spark/mllib/evaluation/AreaUnderCurve.scala
index 078fbfbe4f..f0779491e6 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/evaluation/AreaUnderCurve.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/evaluation/AreaUnderCurve.scala
@@ -17,8 +17,8 @@
 
 package org.apache.spark.mllib.evaluation
 
-import org.apache.spark.rdd.RDD
 import org.apache.spark.mllib.rdd.RDDFunctions._
+import org.apache.spark.rdd.RDD
 
 /**
  * Computes the area under the curve (AUC) using the trapezoidal rule.
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/evaluation/RankingMetrics.scala b/mllib/src/main/scala/org/apache/spark/mllib/evaluation/RankingMetrics.scala
index cc01936dd3..f8de4e2220 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/evaluation/RankingMetrics.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/evaluation/RankingMetrics.scala
@@ -24,7 +24,7 @@ import scala.reflect.ClassTag
 
 import org.apache.spark.Logging
 import org.apache.spark.annotation.Since
-import org.apache.spark.api.java.{JavaSparkContext, JavaRDD}
+import org.apache.spark.api.java.{JavaRDD, JavaSparkContext}
 import org.apache.spark.rdd.RDD
 
 /**
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/evaluation/RegressionMetrics.scala b/mllib/src/main/scala/org/apache/spark/mllib/evaluation/RegressionMetrics.scala
index 1d8f4fe340..34883f2f39 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/evaluation/RegressionMetrics.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/evaluation/RegressionMetrics.scala
@@ -21,7 +21,7 @@ import org.apache.spark.annotation.Since
 import org.apache.spark.rdd.RDD
 import org.apache.spark.Logging
 import org.apache.spark.mllib.linalg.Vectors
-import org.apache.spark.mllib.stat.{MultivariateStatisticalSummary, MultivariateOnlineSummarizer}
+import org.apache.spark.mllib.stat.{MultivariateOnlineSummarizer, MultivariateStatisticalSummary}
 import org.apache.spark.sql.DataFrame
 
 /**
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/feature/ChiSqSelector.scala b/mllib/src/main/scala/org/apache/spark/mllib/feature/ChiSqSelector.scala
index eaa99cfe82..33728bf5d7 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/feature/ChiSqSelector.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/feature/ChiSqSelector.scala
@@ -30,7 +30,7 @@ import org.apache.spark.mllib.stat.Statistics
 import org.apache.spark.mllib.util.{Loader, Saveable}
 import org.apache.spark.rdd.RDD
 import org.apache.spark.SparkContext
-import org.apache.spark.sql.{SQLContext, Row}
+import org.apache.spark.sql.{Row, SQLContext}
 
 /**
  * Chi Squared selector model.
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/feature/Word2Vec.scala b/mllib/src/main/scala/org/apache/spark/mllib/feature/Word2Vec.scala
index 1f400e1430..a7e1b76df6 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/feature/Word2Vec.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/feature/Word2Vec.scala
@@ -24,7 +24,6 @@ import scala.collection.mutable
 import scala.collection.mutable.ArrayBuilder
 
 import com.github.fommil.netlib.BLAS.{getInstance => blas}
-
 import org.json4s.DefaultFormats
 import org.json4s.JsonDSL._
 import org.json4s.jackson.JsonMethods._
@@ -36,9 +35,9 @@ import org.apache.spark.api.java.JavaRDD
 import org.apache.spark.mllib.linalg.{Vector, Vectors}
 import org.apache.spark.mllib.util.{Loader, Saveable}
 import org.apache.spark.rdd._
+import org.apache.spark.sql.SQLContext
 import org.apache.spark.util.Utils
 import org.apache.spark.util.random.XORShiftRandom
-import org.apache.spark.sql.SQLContext
 
 /**
  *  Entry in vocabulary
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/fpm/PrefixSpan.scala b/mllib/src/main/scala/org/apache/spark/mllib/fpm/PrefixSpan.scala
index 97916daa2e..ed49c9492f 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/fpm/PrefixSpan.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/fpm/PrefixSpan.scala
@@ -20,8 +20,8 @@ package org.apache.spark.mllib.fpm
 import java.{lang => jl, util => ju}
 import java.util.concurrent.atomic.AtomicInteger
 
-import scala.collection.mutable
 import scala.collection.JavaConverters._
+import scala.collection.mutable
 import scala.reflect.ClassTag
 
 import org.apache.spark.Logging
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/impl/PeriodicCheckpointer.scala b/mllib/src/main/scala/org/apache/spark/mllib/impl/PeriodicCheckpointer.scala
index 72d3aabc9b..57ca4d3464 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/impl/PeriodicCheckpointer.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/impl/PeriodicCheckpointer.scala
@@ -19,9 +19,9 @@ package org.apache.spark.mllib.impl
 
 import scala.collection.mutable
 
-import org.apache.hadoop.fs.{Path, FileSystem}
+import org.apache.hadoop.fs.{FileSystem, Path}
 
-import org.apache.spark.{SparkContext, Logging}
+import org.apache.spark.{Logging, SparkContext}
 import org.apache.spark.storage.StorageLevel
 
 
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/linalg/EigenValueDecomposition.scala b/mllib/src/main/scala/org/apache/spark/mllib/linalg/EigenValueDecomposition.scala
index 863abe86d3..bb94745f07 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/linalg/EigenValueDecomposition.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/linalg/EigenValueDecomposition.scala
@@ -19,7 +19,7 @@ package org.apache.spark.mllib.linalg
 
 import breeze.linalg.{DenseMatrix => BDM, DenseVector => BDV}
 import com.github.fommil.netlib.ARPACK
-import org.netlib.util.{intW, doubleW}
+import org.netlib.util.{doubleW, intW}
 
 /**
  * Compute eigen-decomposition.
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala b/mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
index 8879dcf75c..d7a74db0b1 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
@@ -19,7 +19,7 @@ package org.apache.spark.mllib.linalg
 
 import java.util.{Arrays, Random}
 
-import scala.collection.mutable.{ArrayBuilder => MArrayBuilder, HashSet => MHashSet, ArrayBuffer}
+import scala.collection.mutable.{ArrayBuffer, ArrayBuilder => MArrayBuilder, HashSet => MHashSet}
 
 import breeze.linalg.{CSCMatrix => BSM, DenseMatrix => BDM, Matrix => BM}
 
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/linalg/Vectors.scala b/mllib/src/main/scala/org/apache/spark/mllib/linalg/Vectors.scala
index 4dcf351df4..cecfd067bd 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/linalg/Vectors.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/linalg/Vectors.scala
@@ -17,8 +17,8 @@
 
 package org.apache.spark.mllib.linalg
 
-import java.util
 import java.lang.{Double => JavaDouble, Integer => JavaInteger, Iterable => JavaIterable}
+import java.util
 
 import scala.annotation.varargs
 import scala.collection.JavaConverters._
@@ -26,7 +26,7 @@ import scala.collection.JavaConverters._
 import breeze.linalg.{DenseVector => BDV, SparseVector => BSV, Vector => BV}
 import org.json4s.DefaultFormats
 import org.json4s.JsonDSL._
-import org.json4s.jackson.JsonMethods.{compact, render, parse => parseJson}
+import org.json4s.jackson.JsonMethods.{compact, parse => parseJson, render}
 
 import org.apache.spark.SparkException
 import org.apache.spark.annotation.{AlphaComponent, Since}
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/CoordinateMatrix.scala b/mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/CoordinateMatrix.scala
index 8a70f34e70..97b03b340f 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/CoordinateMatrix.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/CoordinateMatrix.scala
@@ -20,8 +20,8 @@ package org.apache.spark.mllib.linalg.distributed
 import breeze.linalg.{DenseMatrix => BDM}
 
 import org.apache.spark.annotation.Since
-import org.apache.spark.rdd.RDD
 import org.apache.spark.mllib.linalg.{Matrix, SparseMatrix, Vectors}
+import org.apache.spark.rdd.RDD
 
 /**
  * Represents an entry in an distributed matrix.
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/IndexedRowMatrix.scala b/mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/IndexedRowMatrix.scala
index 976299124c..e8de515211 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/IndexedRowMatrix.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/IndexedRowMatrix.scala
@@ -20,9 +20,9 @@ package org.apache.spark.mllib.linalg.distributed
 import breeze.linalg.{DenseMatrix => BDM}
 
 import org.apache.spark.annotation.Since
-import org.apache.spark.rdd.RDD
 import org.apache.spark.mllib.linalg._
 import org.apache.spark.mllib.linalg.SingularValueDecomposition
+import org.apache.spark.rdd.RDD
 
 /**
  * Represents a row of [[org.apache.spark.mllib.linalg.distributed.IndexedRowMatrix]].
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/RowMatrix.scala b/mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/RowMatrix.scala
index 2018a67868..0a36da4101 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/RowMatrix.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/RowMatrix.scala
@@ -21,8 +21,8 @@ import java.util.Arrays
 
 import scala.collection.mutable.ListBuffer
 
-import breeze.linalg.{DenseMatrix => BDM, DenseVector => BDV, SparseVector => BSV, axpy => brzAxpy,
-  svd => brzSvd, MatrixSingularException, inv}
+import breeze.linalg.{axpy => brzAxpy, inv, svd => brzSvd, DenseMatrix => BDM, DenseVector => BDV,
+  MatrixSingularException, SparseVector => BSV}
 import breeze.numerics.{sqrt => brzSqrt}
 
 import org.apache.spark.Logging
@@ -30,8 +30,8 @@ import org.apache.spark.annotation.Since
 import org.apache.spark.mllib.linalg._
 import org.apache.spark.mllib.stat.{MultivariateOnlineSummarizer, MultivariateStatisticalSummary}
 import org.apache.spark.rdd.RDD
-import org.apache.spark.util.random.XORShiftRandom
 import org.apache.spark.storage.StorageLevel
+import org.apache.spark.util.random.XORShiftRandom
 
 /**
  * Represents a row-oriented distributed Matrix with no meaningful row indices.
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/optimization/GradientDescent.scala b/mllib/src/main/scala/org/apache/spark/mllib/optimization/GradientDescent.scala
index 37bb6f6097..5873669b37 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/optimization/GradientDescent.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/optimization/GradientDescent.scala
@@ -19,12 +19,12 @@ package org.apache.spark.mllib.optimization
 
 import scala.collection.mutable.ArrayBuffer
 
-import breeze.linalg.{DenseVector => BDV, norm}
+import breeze.linalg.{norm, DenseVector => BDV}
 
-import org.apache.spark.annotation.{Experimental, DeveloperApi}
 import org.apache.spark.Logging
+import org.apache.spark.annotation.{DeveloperApi, Experimental}
+import org.apache.spark.mllib.linalg.{Vector, Vectors}
 import org.apache.spark.rdd.RDD
-import org.apache.spark.mllib.linalg.{Vectors, Vector}
 
 
 /**
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/optimization/Optimizer.scala b/mllib/src/main/scala/org/apache/spark/mllib/optimization/Optimizer.scala
index 7f6d94571b..d8e5672096 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/optimization/Optimizer.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/optimization/Optimizer.scala
@@ -17,10 +17,9 @@
 
 package org.apache.spark.mllib.optimization
 
-import org.apache.spark.rdd.RDD
-
 import org.apache.spark.annotation.DeveloperApi
 import org.apache.spark.mllib.linalg.Vector
+import org.apache.spark.rdd.RDD
 
 /**
  * :: DeveloperApi ::
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/optimization/Updater.scala b/mllib/src/main/scala/org/apache/spark/mllib/optimization/Updater.scala
index 9f463e0caf..03c01e0553 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/optimization/Updater.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/optimization/Updater.scala
@@ -19,10 +19,10 @@ package org.apache.spark.mllib.optimization
 
 import scala.math._
 
-import breeze.linalg.{norm => brzNorm, axpy => brzAxpy, Vector => BV}
+import breeze.linalg.{axpy => brzAxpy, norm => brzNorm, Vector => BV}
 
 import org.apache.spark.annotation.DeveloperApi
-import org.apache.spark.mllib.linalg.{Vectors, Vector}
+import org.apache.spark.mllib.linalg.{Vector, Vectors}
 
 /**
  * :: DeveloperApi ::
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/random/RandomDataGenerator.scala b/mllib/src/main/scala/org/apache/spark/mllib/random/RandomDataGenerator.scala
index 9eab7efc16..fa04f8eb5e 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/random/RandomDataGenerator.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/random/RandomDataGenerator.scala
@@ -19,8 +19,8 @@ package org.apache.spark.mllib.random
 
 import org.apache.commons.math3.distribution._
 
-import org.apache.spark.annotation.{Since, DeveloperApi}
-import org.apache.spark.util.random.{XORShiftRandom, Pseudorandom}
+import org.apache.spark.annotation.{DeveloperApi, Since}
+import org.apache.spark.util.random.{Pseudorandom, XORShiftRandom}
 
 /**
  * :: DeveloperApi ::
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/rdd/RandomRDD.scala b/mllib/src/main/scala/org/apache/spark/mllib/rdd/RandomRDD.scala
index f8cea7ecea..92bc66949a 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/rdd/RandomRDD.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/rdd/RandomRDD.scala
@@ -17,15 +17,15 @@
 
 package org.apache.spark.mllib.rdd
 
+import scala.reflect.ClassTag
+import scala.util.Random
+
 import org.apache.spark.{Partition, SparkContext, TaskContext}
 import org.apache.spark.mllib.linalg.{DenseVector, Vector}
 import org.apache.spark.mllib.random.RandomDataGenerator
 import org.apache.spark.rdd.RDD
 import org.apache.spark.util.Utils
 
-import scala.reflect.ClassTag
-import scala.util.Random
-
 private[mllib] class RandomRDDPartition[T](override val index: Int,
     val size: Int,
     val generator: RandomDataGenerator[T],
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/rdd/SlidingRDD.scala b/mllib/src/main/scala/org/apache/spark/mllib/rdd/SlidingRDD.scala
index ead8db6344..adb5e51947 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/rdd/SlidingRDD.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/rdd/SlidingRDD.scala
@@ -20,7 +20,7 @@ package org.apache.spark.mllib.rdd
 import scala.collection.mutable
 import scala.reflect.ClassTag
 
-import org.apache.spark.{TaskContext, Partition}
+import org.apache.spark.{Partition, TaskContext}
 import org.apache.spark.rdd.RDD
 
 private[mllib]
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/regression/GeneralizedLinearAlgorithm.scala b/mllib/src/main/scala/org/apache/spark/mllib/regression/GeneralizedLinearAlgorithm.scala
index 8f657bfb9c..e60edc675c 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/regression/GeneralizedLinearAlgorithm.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/regression/GeneralizedLinearAlgorithm.scala
@@ -17,13 +17,13 @@
 
 package org.apache.spark.mllib.regression
 
+import org.apache.spark.{Logging, SparkException}
 import org.apache.spark.annotation.{DeveloperApi, Since}
 import org.apache.spark.mllib.feature.StandardScaler
-import org.apache.spark.{Logging, SparkException}
-import org.apache.spark.rdd.RDD
+import org.apache.spark.mllib.linalg.{Vector, Vectors}
 import org.apache.spark.mllib.optimization._
-import org.apache.spark.mllib.linalg.{Vectors, Vector}
 import org.apache.spark.mllib.util.MLUtils._
+import org.apache.spark.rdd.RDD
 import org.apache.spark.storage.StorageLevel
 
 /**
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/regression/LabeledPoint.scala b/mllib/src/main/scala/org/apache/spark/mllib/regression/LabeledPoint.scala
index c284ad2325..45540f0c5c 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/regression/LabeledPoint.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/regression/LabeledPoint.scala
@@ -20,7 +20,7 @@ package org.apache.spark.mllib.regression
 import scala.beans.BeanInfo
 
 import org.apache.spark.annotation.Since
-import org.apache.spark.mllib.linalg.{Vectors, Vector}
+import org.apache.spark.mllib.linalg.{Vector, Vectors}
 import org.apache.spark.mllib.util.NumericParser
 import org.apache.spark.SparkException
 
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/regression/Lasso.scala b/mllib/src/main/scala/org/apache/spark/mllib/regression/Lasso.scala
index a9aba173fa..d55e5dfdaa 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/regression/Lasso.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/regression/Lasso.scala
@@ -23,7 +23,7 @@ import org.apache.spark.mllib.linalg.Vector
 import org.apache.spark.mllib.optimization._
 import org.apache.spark.mllib.pmml.PMMLExportable
 import org.apache.spark.mllib.regression.impl.GLMRegressionModel
-import org.apache.spark.mllib.util.{Saveable, Loader}
+import org.apache.spark.mllib.util.{Loader, Saveable}
 import org.apache.spark.rdd.RDD
 
 /**
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/regression/LinearRegression.scala b/mllib/src/main/scala/org/apache/spark/mllib/regression/LinearRegression.scala
index 4996ace5df..7da82c862a 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/regression/LinearRegression.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/regression/LinearRegression.scala
@@ -23,7 +23,7 @@ import org.apache.spark.mllib.linalg.Vector
 import org.apache.spark.mllib.optimization._
 import org.apache.spark.mllib.pmml.PMMLExportable
 import org.apache.spark.mllib.regression.impl.GLMRegressionModel
-import org.apache.spark.mllib.util.{Saveable, Loader}
+import org.apache.spark.mllib.util.{Loader, Saveable}
 import org.apache.spark.rdd.RDD
 
 /**
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/stat/MultivariateOnlineSummarizer.scala b/mllib/src/main/scala/org/apache/spark/mllib/stat/MultivariateOnlineSummarizer.scala
index 201333c369..98404be260 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/stat/MultivariateOnlineSummarizer.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/stat/MultivariateOnlineSummarizer.scala
@@ -18,7 +18,7 @@
 package org.apache.spark.mllib.stat
 
 import org.apache.spark.annotation.{DeveloperApi, Since}
-import org.apache.spark.mllib.linalg.{Vectors, Vector}
+import org.apache.spark.mllib.linalg.{Vector, Vectors}
 
 /**
  * :: DeveloperApi ::
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/stat/Statistics.scala b/mllib/src/main/scala/org/apache/spark/mllib/stat/Statistics.scala
index bcb33a7a04..f3159f7e72 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/stat/Statistics.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/stat/Statistics.scala
@@ -20,9 +20,9 @@ package org.apache.spark.mllib.stat
 import scala.annotation.varargs
 
 import org.apache.spark.annotation.Since
-import org.apache.spark.api.java.{JavaRDD, JavaDoubleRDD}
-import org.apache.spark.mllib.linalg.distributed.RowMatrix
+import org.apache.spark.api.java.{JavaDoubleRDD, JavaRDD}
 import org.apache.spark.mllib.linalg.{Matrix, Vector}
+import org.apache.spark.mllib.linalg.distributed.RowMatrix
 import org.apache.spark.mllib.regression.LabeledPoint
 import org.apache.spark.mllib.stat.correlation.Correlations
 import org.apache.spark.mllib.stat.test.{ChiSqTest, ChiSqTestResult, KolmogorovSmirnovTest,
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/stat/distribution/MultivariateGaussian.scala b/mllib/src/main/scala/org/apache/spark/mllib/stat/distribution/MultivariateGaussian.scala
index 0724af9308..052b5b1d65 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/stat/distribution/MultivariateGaussian.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/stat/distribution/MultivariateGaussian.scala
@@ -17,10 +17,10 @@
 
 package org.apache.spark.mllib.stat.distribution
 
-import breeze.linalg.{DenseVector => DBV, DenseMatrix => DBM, diag, max, eigSym, Vector => BV}
+import breeze.linalg.{diag, eigSym, max, DenseMatrix => DBM, DenseVector => DBV, Vector => BV}
 
 import org.apache.spark.annotation.{DeveloperApi, Since}
-import org.apache.spark.mllib.linalg.{Vectors, Vector, Matrices, Matrix}
+import org.apache.spark.mllib.linalg.{Matrices, Matrix, Vector, Vectors}
 import org.apache.spark.mllib.util.MLUtils
 
 /**
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/stat/test/ChiSqTest.scala b/mllib/src/main/scala/org/apache/spark/mllib/stat/test/ChiSqTest.scala
index 23c8d7c7c8..f22f2df320 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/stat/test/ChiSqTest.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/stat/test/ChiSqTest.scala
@@ -17,16 +17,16 @@
 
 package org.apache.spark.mllib.stat.test
 
+import scala.collection.mutable
+
 import breeze.linalg.{DenseMatrix => BDM}
 import org.apache.commons.math3.distribution.ChiSquaredDistribution
 
-import org.apache.spark.{SparkException, Logging}
+import org.apache.spark.{Logging, SparkException}
 import org.apache.spark.mllib.linalg.{Matrices, Matrix, Vector, Vectors}
 import org.apache.spark.mllib.regression.LabeledPoint
 import org.apache.spark.rdd.RDD
 
-import scala.collection.mutable
-
 /**
  * Conduct the chi-squared test for the input RDDs using the specified method.
  * Goodness-of-fit test is conducted on two `Vectors`, whereas test of independence is conducted
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/tree/configuration/BoostingStrategy.scala b/mllib/src/main/scala/org/apache/spark/mllib/tree/configuration/BoostingStrategy.scala
index d2513a9d5c..0b118a7673 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/tree/configuration/BoostingStrategy.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/tree/configuration/BoostingStrategy.scala
@@ -21,7 +21,7 @@ import scala.beans.BeanProperty
 
 import org.apache.spark.annotation.Since
 import org.apache.spark.mllib.tree.configuration.Algo._
-import org.apache.spark.mllib.tree.loss.{LogLoss, SquaredError, Loss}
+import org.apache.spark.mllib.tree.loss.{LogLoss, Loss, SquaredError}
 
 /**
  * Configuration options for [[org.apache.spark.mllib.tree.GradientBoostedTrees]].
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/tree/configuration/Strategy.scala b/mllib/src/main/scala/org/apache/spark/mllib/tree/configuration/Strategy.scala
index 372d6617a4..6c04403f1a 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/tree/configuration/Strategy.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/tree/configuration/Strategy.scala
@@ -21,9 +21,9 @@ import scala.beans.BeanProperty
 import scala.collection.JavaConverters._
 
 import org.apache.spark.annotation.Since
-import org.apache.spark.mllib.tree.impurity.{Variance, Entropy, Gini, Impurity}
 import org.apache.spark.mllib.tree.configuration.Algo._
 import org.apache.spark.mllib.tree.configuration.QuantileStrategy._
+import org.apache.spark.mllib.tree.impurity.{Entropy, Gini, Impurity, Variance}
 
 /**
  * Stores all the configuration options for tree construction
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/tree/impl/NodeIdCache.scala b/mllib/src/main/scala/org/apache/spark/mllib/tree/impl/NodeIdCache.scala
index 1c611976a9..fbbec11974 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/tree/impl/NodeIdCache.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/tree/impl/NodeIdCache.scala
@@ -19,13 +19,13 @@ package org.apache.spark.mllib.tree.impl
 
 import scala.collection.mutable
 
-import org.apache.hadoop.fs.{Path, FileSystem}
+import org.apache.hadoop.fs.{FileSystem, Path}
 
-import org.apache.spark.rdd.RDD
 import org.apache.spark.annotation.DeveloperApi
 import org.apache.spark.mllib.tree.configuration.FeatureType._
-import org.apache.spark.storage.StorageLevel
 import org.apache.spark.mllib.tree.model.{Bin, Node, Split}
+import org.apache.spark.rdd.RDD
+import org.apache.spark.storage.StorageLevel
 
 /**
  * :: DeveloperApi ::
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/tree/model/Node.scala b/mllib/src/main/scala/org/apache/spark/mllib/tree/model/Node.scala
index ea6e5aa5d9..66f0908c12 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/tree/model/Node.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/tree/model/Node.scala
@@ -17,10 +17,10 @@
 
 package org.apache.spark.mllib.tree.model
 
-import org.apache.spark.annotation.{DeveloperApi, Since}
 import org.apache.spark.Logging
-import org.apache.spark.mllib.tree.configuration.FeatureType._
+import org.apache.spark.annotation.{DeveloperApi, Since}
 import org.apache.spark.mllib.linalg.Vector
+import org.apache.spark.mllib.tree.configuration.FeatureType._
 
 /**
  * :: DeveloperApi ::
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/tree/model/Split.scala b/mllib/src/main/scala/org/apache/spark/mllib/tree/model/Split.scala
index b85a66c05a..783a4acb55 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/tree/model/Split.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/tree/model/Split.scala
@@ -18,7 +18,6 @@
 package org.apache.spark.mllib.tree.model
 
 import org.apache.spark.annotation.{DeveloperApi, Since}
-import org.apache.spark.mllib.tree.configuration.FeatureType.FeatureType
 import org.apache.spark.mllib.tree.configuration.FeatureType
 import org.apache.spark.mllib.tree.configuration.FeatureType.FeatureType
 
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/util/LogisticRegressionDataGenerator.scala b/mllib/src/main/scala/org/apache/spark/mllib/util/LogisticRegressionDataGenerator.scala
index 33477ee20e..68835bc796 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/util/LogisticRegressionDataGenerator.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/util/LogisticRegressionDataGenerator.scala
@@ -19,11 +19,11 @@ package org.apache.spark.mllib.util
 
 import scala.util.Random
 
-import org.apache.spark.annotation.{Since, DeveloperApi}
 import org.apache.spark.SparkContext
-import org.apache.spark.rdd.RDD
-import org.apache.spark.mllib.regression.LabeledPoint
+import org.apache.spark.annotation.{DeveloperApi, Since}
 import org.apache.spark.mllib.linalg.Vectors
+import org.apache.spark.mllib.regression.LabeledPoint
+import org.apache.spark.rdd.RDD
 
 /**
  * :: DeveloperApi ::
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/util/MFDataGenerator.scala b/mllib/src/main/scala/org/apache/spark/mllib/util/MFDataGenerator.scala
index 906bd30563..8af6750da4 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/util/MFDataGenerator.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/util/MFDataGenerator.scala
@@ -23,7 +23,7 @@ import scala.language.postfixOps
 import scala.util.Random
 
 import org.apache.spark.SparkContext
-import org.apache.spark.annotation.{Since, DeveloperApi}
+import org.apache.spark.annotation.{DeveloperApi, Since}
 import org.apache.spark.mllib.linalg.{BLAS, DenseMatrix}
 import org.apache.spark.rdd.RDD
 
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/util/MLUtils.scala b/mllib/src/main/scala/org/apache/spark/mllib/util/MLUtils.scala
index 4c9151f0cb..89186de969 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/util/MLUtils.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/util/MLUtils.scala
@@ -19,15 +19,14 @@ package org.apache.spark.mllib.util
 
 import scala.reflect.ClassTag
 
-import org.apache.spark.annotation.Since
 import org.apache.spark.SparkContext
-import org.apache.spark.rdd.RDD
-import org.apache.spark.rdd.PartitionwiseSampledRDD
-import org.apache.spark.util.random.BernoulliCellSampler
-import org.apache.spark.mllib.regression.LabeledPoint
-import org.apache.spark.mllib.linalg.{SparseVector, DenseVector, Vector, Vectors}
+import org.apache.spark.annotation.Since
+import org.apache.spark.mllib.linalg.{DenseVector, SparseVector, Vector, Vectors}
 import org.apache.spark.mllib.linalg.BLAS.dot
+import org.apache.spark.mllib.regression.LabeledPoint
+import org.apache.spark.rdd.{PartitionwiseSampledRDD, RDD}
 import org.apache.spark.storage.StorageLevel
+import org.apache.spark.util.random.BernoulliCellSampler
 
 /**
  * Helper methods to load, save and pre-process data used in ML Lib.
diff --git a/scalastyle-config.xml b/scalastyle-config.xml
index 6925e18737..16d18b3328 100644
--- a/scalastyle-config.xml
+++ b/scalastyle-config.xml
@@ -219,8 +219,8 @@ This file is divided into 3 sections:
   <check level="warning" class="org.scalastyle.scalariform.ImportOrderChecker" enabled="true">
     <parameters>
       <parameter name="groups">java,scala,3rdParty,spark</parameter>
-      <parameter name="group.java">javax?\..+</parameter>
-      <parameter name="group.scala">scala\..+</parameter>
+      <parameter name="group.java">javax?\..*</parameter>
+      <parameter name="group.scala">scala\..*</parameter>
       <parameter name="group.3rdParty">(?!org\.apache\.spark\.).*</parameter>
       <parameter name="group.spark">org\.apache\.spark\..*</parameter>
     </parameters>