Github user BryanCutler commented on a diff in the pull request:

    https://github.com/apache/spark/pull/12896#discussion_r62096297
  
    --- Diff: mllib/src/main/scala/org/apache/spark/ml/recommendation/ALS.scala 
---
    @@ -268,6 +294,10 @@ class ALSModel private[ml] (
     @Since("1.6.0")
     object ALSModel extends MLReadable[ALSModel] {
     
    +  private val NaN = "nan"
    +  private val Drop = "drop"
    +  private[recommendation] final val supportedUnknownStrategies = 
Array(NaN, Drop)
    --- End diff --
    
    Instead of adding an array here, could you just create it in the 
`ParamValidator` when defining the `Param`?
    ```scala
    ParamValidators.inArray(Array(ALSModel.NaN, ALSModel.Drop))
    ```


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