Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/5740#discussion_r29273024
--- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/HashingTF.scala
---
@@ -32,10 +32,14 @@ import org.apache.spark.sql.types.DataType
class HashingTF extends UnaryTransformer[Iterable[_], Vector, HashingTF] {
/**
- * number of features
+ * Number of features. Should be > 0.
+ * (default = 2^18^)
* @group param
*/
- val numFeatures = new IntParam(this, "numFeatures", "number of features")
+ val numFeatures = new IntParam(this, "numFeatures", "number of features
(> 0)",
+ ParamValidate.gt[Int](0))
--- End diff --
`[Int]` is not necessary.
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