variable rename

Author: YY-OnCall

examples/src/main/java/org/apache/spark/examples/ml/JavaImputerExample.java

@@ -58,12 +58,11 @@ public static void main(String[] args) {
     });
     Dataset<Row> df = spark.createDataFrame(data, schema);
 
-    Imputer imputerModel = new Imputer()
-      .setStrategy("mean")
+    Imputer imputer = new Imputer()
       .setInputCols(new String[]{"a", "b"})
       .setOutputCols(new String[]{"out_a", "out_b"});
 
-    ImputerModel model = imputerModel.fit(df);
+    ImputerModel model = imputer.fit(df);
     model.transform(df).show();
     // $example off$
 

examples/src/main/python/ml/imputer_example.py

@@ -42,10 +42,9 @@
     ], ["a", "b"])
 
     imputer = Imputer(inputCols=["a", "b"], outputCols=["out_a", "out_b"])
-    imputerModel = imputer.fit(df)
+    model = imputer.fit(df)
 
-    imputedData = imputerModel.transform(df)
-    imputedData.select("a", "b", "out_a", "out_b").show()
+    model.transform(df).select("a", "b", "out_a", "out_b").show()
     # $example off$
 
     spark.stop()

examples/src/main/scala/org/apache/spark/examples/ml/ImputerExample.scala

@@ -44,7 +44,6 @@ object ImputerExample {
     )).toDF("a", "b")
 
     val imputer = new Imputer()
-      .setStrategy("mean")
       .setInputCols(Array("a", "b"))
       .setOutputCols(Array("out_a", "out_b"))