Liang-Chi Hsieh created SPARK-5099:
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Summary: Simplify logistic loss function and fix deviance loss
function
Key: SPARK-5099
URL: https://issues.apache.org/jira/browse/SPARK-5099
Project: Spark
Issue Type: Bug
Reporter: Liang-Chi Hsieh
Priority: Minor
This is a minor pr where I think that we can simply take minus of margin,
instead of subtracting margin, in the LogisticGradient.
Mathematically, they are equal. But the modified equation is the common form of
logistic loss function and so more readable. It also computes more accurate
value as some quick tests show.
Besides, there is a bug in computing the loss in LogLoss. This pr fixes it too.
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