Github user srowen commented on the issue:

    https://github.com/apache/spark/pull/14949
  
    The problem is that it's called 'threshold' and not 'weight', and 
'threshold' means something different. Is anyone suggesting that it was always 
meant as a 'weight', and/or has a reference for this type of weighting? I've 
never seen it ... not sure what multiplying a probability by 1/weight would 
mean theoretically.
    
    Note this change would also make threshold matter as a tie-breaker.


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