Github user BryanCutler commented on the issue: https://github.com/apache/spark/pull/17306 Yeah, that's true in this case. You could just build the grids separately and combine them like this ```scala val pipeline1_grid = new ParamGridBuilder() .baseOn(pipeline.stages -> pipeline1) .addGrid(hashingTF.numFeatures, Array(10, 100, 1000)) .addGrid(lr.regParam, Array(0.1, 0.01)) .build() val pipeline2_grid = new ParamGridBuilder() .baseOn(pipeline.stages -> pipeline2) .addGrid(hashingTF.numFeatures, Array(10, 100, 1000)) .build() val paramGrid = pipeline1_grid ++ pipeline2_grid ``` Maybe not all that intuitive though... It might be worth it to add some smarts in the `ParamGridBuilder` or `CrossValidator` to prune the grid if there is a pipeline and params not used in any of the stages.
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