Github user yanboliang commented on a diff in the pull request:
https://github.com/apache/spark/pull/11179#discussion_r52871118
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/regression/AFTSurvivalRegression.scala
---
@@ -481,8 +481,10 @@ private class AFTAggregator(parameters: BDV[Double],
fitIntercept: Boolean)
assert(!lossSum.isInfinity,
s"AFTAggregator loss sum is infinity. Error for unknown reason.")
- gradientBetaSum += xi * (delta - math.exp(epsilon)) / sigma
- gradientLogSigmaSum += delta + (delta - math.exp(epsilon)) * epsilon
+ val delta_expeps = delta - math.exp(epsilon)
--- End diff --
```delta_expeps``` -> ```deltaMinusExpEps```, we use the camel case
convention.
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