Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/8152#discussion_r37038684
--- Diff:
mllib/src/test/scala/org/apache/spark/ml/feature/StringIndexerSuite.scala ---
@@ -120,4 +108,36 @@ class StringIndexerSuite extends SparkFunSuite with
MLlibTestSparkContext {
val df = sqlContext.range(0L, 10L)
assert(indexerModel.transform(df).eq(df))
}
+
+ test("IndexToString params") {
+ val idxToStr = new IndexToString()
+ ParamsSuite.checkParams(idxToStr)
+ }
+
+ test("IndexToString.transform") {
+ val labels = Array("a", "b", "c")
+ val df0 = sqlContext.createDataFrame(Seq(
+ (0, "a"), (1, "b"), (2, "c"), (0, "a")
+ )).toDF("index", "expected")
+
+ val idxToStr0 = new IndexToString()
+ .setInputCol("index")
+ .setOutputCol("actual")
+ .setLabels(labels)
+ idxToStr0.transform(df0).select("actual",
"expected").collect().foreach {
+ case Row(actual, expected) =>
+ assert(actual === expected)
+ }
+
+ val attr = NominalAttribute.defaultAttr.withValues(labels)
--- End diff --
This is more like a unit test. If we want to check that, we should put
another unit test for `StringIndexer`.
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