Siddharth Murching created SPARK-21770:
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             Summary: ProbabilisticClassificationModel: Improve normalization 
of all-zero raw predictions
                 Key: SPARK-21770
                 URL: https://issues.apache.org/jira/browse/SPARK-21770
             Project: Spark
          Issue Type: Improvement
          Components: ML
    Affects Versions: 2.3.0
            Reporter: Siddharth Murching
            Priority: Minor


Given a raw prediction vector of all-zeros, 
ProbabilisticClassifierModel.normalizeToProbabilitiesInPlace() should output a 
probability vector that predicts each class with equal probability (1 / 
numClasses).



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