zhengruifeng commented on issue #23818: [SPARK-19591][ML][PYSPARK][FOLLOWUP] 
Add sample weights to decision trees
URL: https://github.com/apache/spark/pull/23818#issuecomment-465027526
 
 
   @imatiach-msft Thanks for pointing out that `weightCol` is meaningless in 
GBTs. I will remove it in the python side. And I will fix the scala side in 
another pr. Thanks!

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