sarutak opened a new pull request #32673:
URL: https://github.com/apache/spark/pull/32673
### What changes were proposed in this pull request?
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This PR fixes an test failure of `DifferentiableLossAggregatorSuite` with
Java 11.
### Why are the changes needed?
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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
To remove the rounding error, this PR changes `TestAggregator.add` with fma.
### Does this PR introduce _any_ user-facing change?
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No.
### How was this patch tested?
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I confirmed `DifferentiableLossAggregatorSuite` passes with both Java 8 and
Java 11.
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