Github user srowen commented on the issue:

    https://github.com/apache/spark/pull/15149
  
    Right now, that limit is only for parity with the randomForest package that 
this is apparently based on. I agree that it's not clear why these couldn't sum 
to something more than 1. If they were to be interpreted as prior probabilities 
then they really should sum to 1 exactly.
    
    I'm neutral on changing it ... not changing this would make this less of a 
behavior change, which is nice. The real problem we're trying to solve here is 
requiring all thresholds to be positive.


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