WeichenXu123 commented on pull request #31693:
URL: https://github.com/apache/spark/pull/31693#issuecomment-796724756


   @zhengruifeng 
   ```
   prediction diff:
   avg(abs(diff_raw_prediction)) = 0.007523936579265968
   max(abs(diff_raw_prediction)) = 0.045657305342184706
   ```
   
   Because raw-prediction may be a small value, Could you provide the following 
instead:
   ```
   avg(abs(diff_raw_prediction)/raw_prediction_from_center_model)
   max(abs(diff_raw_prediction)/raw_prediction_from_center_model) 
   ```


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