[jira] [Created] (SPARK-35530) Fix rounding error in DifferentiableLossAggregatorSuite with Java 11

["Kousuke Saruta (Jira)" <ji...@apache.org>]

Kousuke Saruta created SPARK-35530:
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             Summary: Fix rounding error in DifferentiableLossAggregatorSuite with Java 11
                 Key: SPARK-35530
                 URL: https://issues.apache.org/jira/browse/SPARK-35530
             Project: Spark
          Issue Type: Bug
          Components: ML, Tests
    Affects Versions: 3.2.0
            Reporter: Kousuke Saruta
            Assignee: Kousuke Saruta




I'm personally checking whether all the tests pass with Java 11 for the current master and I found DifferentiableLossAggregatorSuite fails.
https://github.com/sarutak/spark/runs/2661859541?check_suite_focus=true#step:9:13895

The reason seems that the implementation of Blas.daxpy is different between for Java 8 and Java 11. For Java 11, Math.fma is used.

https://github.com/luhenry/netlib/blob/v2.2.0/blas/src/main/java/dev/ludovic/netlib/blas/Java8BLAS.java#L92
https://github.com/luhenry/netlib/blob/0053ea30b11686336cbdb8c7fceb41d59d268fa2/blas/src/main/java/dev/ludovic/netlib/blas/Java11BLAS.java#L40



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