Pass scala coding style checking

Author: Alain

mllib/src/main/scala/org/apache/spark/mllib/tree/model/InformationGainStats.scala

@@ -39,7 +39,8 @@ class InformationGainStats(
     val rightPredict: Predict) extends Serializable {
 
   override def toString: String = {
-    s"gain = $gain, impurity = $impurity, left impurity = $leftImpurity, right impurity = $rightImpurity"
+    s"gain = $gain, impurity = $impurity, left impurity = $leftImpurity, " +
+      s"right impurity = $rightImpurity"
   }
 
   override def equals(o: Any): Boolean = o match {

mllib/src/main/scala/org/apache/spark/mllib/tree/model/Predict.scala

@@ -29,7 +29,7 @@ class Predict(
     val predict: Double,
     val prob: Double = 0.0) extends Serializable {
 
-  override def toString: String = s"$predict(prob = $prob)"
+  override def toString: String = s"$predict (prob = $prob)"
 
   override def equals(other: Any): Boolean = {
     other match {