Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/5740#discussion_r29273033
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/feature/PolynomialExpansion.scala ---
@@ -38,9 +38,12 @@ class PolynomialExpansion extends
UnaryTransformer[Vector, Vector, PolynomialExp
/**
* The polynomial degree to expand, which should be larger than 1.
+ * Default: 2
* @group param
*/
- val degree = new IntParam(this, "degree", "the polynomial degree to
expand")
+ val degree = new IntParam(this, "degree", "the polynomial degree to
expand",
+ ParamValidate.gt[Int](2))
--- End diff --
`gt(1)`. Users may set degree to `1` to turn off polynomial expansion in
tuning.
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