modify per scalastyle check

Jacky Li · Jacky Li · commit 889b33fdfabc · 2014-10-19T02:31:04.000-07:00
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/fim/Apriori.scala b/mllib/src/main/scala/org/apache/spark/mllib/fim/Apriori.scala
@@ -22,20 +22,21 @@ import org.apache.spark.SparkContext._
 import org.apache.spark.{Logging, SparkContext}
 
 /**
- * This object implements Apriori algorithm using Spark to find frequent item set in the given data set.
+ * This object implements Apriori algorithm using Spark to find frequent item set in
+ * the given data set.
  */
 object Apriori extends Logging with Serializable {
 
   /**
-   * Generate the first round FIS(frequent item set) from input data set. Returns single distinct item that
-   * appear greater than minCount times.
-   * 
+   * Generate the first round FIS(frequent item set) from input data set. Returns single
+   * distinct item that appear greater than minCount times.
+   *
    * @param dataSet input data set
    * @param minCount the minimum appearance time that computed from minimum degree of support
    * @return FIS
    */
   private def genFirstRoundFIS(dataSet: RDD[Set[String]],
-                        minCount: Double): RDD[(Set[String], Int)] = {
+                               minCount: Double): RDD[(Set[String], Int)] = {
     dataSet.flatMap(line => line)
       .map(v => (v, 1))
       .reduceByKey(_ + _)
@@ -50,16 +51,16 @@ object Apriori extends Logging with Serializable {
    * @return FIS
    */
   private def scanAndFilter(dataSet: RDD[Set[String]],
-               candidate: RDD[Set[String]],
-               minCount: Double,
-               sc: SparkContext): RDD[(Set[String], Int)] = {
+                            candidate: RDD[Set[String]],
+                            minCount: Double,
+                            sc: SparkContext): RDD[(Set[String], Int)] = {
 
     dataSet.cartesian(candidate).map(x =>
       if (x._2.subsetOf(x._1)) {
         (x._2, 1)
       } else {
         (x._2, 0)
-      }).reduceByKey(_+_).filter(x => x._2 >= minCount)
+      }).reduceByKey(_ + _).filter(x => x._2 >= minCount)
   }
 
   /**
@@ -69,7 +70,7 @@ object Apriori extends Logging with Serializable {
    * @return candidate FIS
    */
   private def generateCombination(FISk: RDD[Set[String]],
-                 k: Int): RDD[Set[String]] = {
+                                  k: Int): RDD[Set[String]] = {
     FISk.cartesian(FISk)
       .map(x => x._1 ++ x._2)
       .filter(x => x.size == k)
@@ -85,15 +86,16 @@ object Apriori extends Logging with Serializable {
    * @return frequent item sets in a array
    */
   def apriori(input: RDD[Array[String]],
-                 minSupport: Double,
-                 sc: SparkContext): Array[(Set[String], Int)] = {
+              minSupport: Double,
+              sc: SparkContext): Array[(Set[String], Int)] = {
 
     /*
      * This apriori implementation uses cartesian of two RDD, input data set and candidate
      * FIS (frequent item set).
      * The resulting FIS are computed in two steps:
      * The first step, find eligible distinct item in data set.
-     * The second step, loop in k round, in each round generate candidate FIS and filter out eligible FIS
+     * The second step, loop in k round, in each round generate candidate FIS and filter
+     * out eligible FIS
      */
 
     // calculate minimum appearance count for minimum degree of support
@@ -144,9 +146,9 @@ object Apriori extends Logging with Serializable {
     FIS.collect().foreach(x => print("(" + x._1 + ", " + x._2 + ") "))
     println()
   }
-  
+
   private def printCk(Ck: RDD[Set[String]], k: Int) {
-    print("C" + (k - 2) + " size "+ Ck.count() + " value: ")
+    print("C" + (k - 2) + " size " + Ck.count() + " value: ")
     Ck.collect().foreach(print)
     println()
   }
