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

    https://github.com/apache/spark/pull/17373#discussion_r130746928
  
    --- Diff: mllib/src/main/scala/org/apache/spark/ml/ann/Layer.scala ---
    @@ -463,7 +479,7 @@ private[ml] class FeedForwardModel private(
       private var outputs: Array[BDM[Double]] = null
       private var deltas: Array[BDM[Double]] = null
     
    -  override def forward(data: BDM[Double]): Array[BDM[Double]] = {
    +  override def forward(data: BDM[Double], containsLastLayer: Boolean): 
Array[BDM[Double]] = {
         // Initialize output arrays for all layers. Special treatment for 
InPlace
    --- End diff --
    
    Could you add the above comment in the code, it could be useful for folks 
reading/editing this in the future.
    
    Also it seems like the last layer could also be a 
SigmoidLayerWithSqueredError or a SigmiodFunction do we need to hand those 
cases any differently?


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