Github user srowen commented on the issue:
https://github.com/apache/spark/pull/18797
The actual failure in the first two cases looks like it must be related:
```
sbt.ForkMain$ForkError: java.lang.IllegalArgumentException: requirement
failed: init value should <= bound
at scala.Predef$.require(Predef.scala:224)
at
breeze.optimize.StrongWolfeLineSearch.minimizeWithBound(StrongWolfe.scala:73)
at breeze.optimize.StrongWolfeLineSearch.minimize(StrongWolfe.scala:62)
at breeze.optimize.LBFGS.determineStepSize(LBFGS.scala:76)
at breeze.optimize.LBFGS.determineStepSize(LBFGS.scala:39)
at
breeze.optimize.FirstOrderMinimizer$$anonfun$infiniteIterations$1.apply(FirstOrderMinimizer.scala:64)
at
breeze.optimize.FirstOrderMinimizer$$anonfun$infiniteIterations$1.apply(FirstOrderMinimizer.scala:62)
at scala.collection.Iterator$$anon$7.next(Iterator.scala:129)
at
breeze.util.IteratorImplicits$RichIterator$$anon$2.next(Implicits.scala:71)
at
org.apache.spark.ml.regression.AFTSurvivalRegression.fit(AFTSurvivalRegression.scala:263)
at
org.apache.spark.ml.regression.AFTSurvivalRegression.fit(AFTSurvivalRegression.scala:128)
```
The last one looks like it's just expecting a different convergence
sequence. I don't know much about it but didn't seem too odd at first glance.
If I have time later this week I'll try to rerun locally and see if the test
fixes look easy.
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