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Posted to issues@spark.apache.org by "Matthew Ball (Jira)" <ji...@apache.org> on 2026/07/21 03:46:00 UTC

[jira] [Created] (SPARK-58231) Add regression test for SVD++ aggregateMessages combiner

Matthew Ball created SPARK-58231:
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             Summary: Add regression test for SVD++ aggregateMessages combiner
                 Key: SPARK-58231
                 URL: https://issues.apache.org/jira/browse/SPARK-58231
             Project: Spark
          Issue Type: Test
          Components: GraphX
    Affects Versions: 5.0.0
            Reporter: Matthew Ball


Follow-up to SPARK-58177 / PR #57314, which fixed a wrong operand in the SVD++ Phase 2 aggregateMessages combiner (the second vector was based on g2._2, dropping g1._2 and doubling g2._2). That fix merged without a test. This adds a regression test: the training-phase message combiner is extracted into a package-private SVDPlusPlus.combineTrainMessages method and unit-tested in SVDPlusPlusSuite to assert both vectors and the scalar are summed element-wise. The test fails on the pre-fix operand and passes on the fix.



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