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https://issues.apache.org/jira/browse/SPARK-58177?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SPARK-58177:
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Labels: pull-request-available (was: )
> Fix wrong operand in SVD++ aggregateMessages combiner
> -----------------------------------------------------
>
> Key: SPARK-58177
> URL: https://issues.apache.org/jira/browse/SPARK-58177
> Project: Spark
> Issue Type: Bug
> Components: GraphX
> Affects Versions: 5.0.0
> Reporter: Matthew Ball
> Priority: Major
> Labels: pull-request-available
>
> When SVD++ combines two updates for the same node, it is supposed to add them
> together. For one of the values, the code started from the wrong update, so
> that value was never actually added up: it doubled one side and threw the
> other away. Any node with two or more edges ended up with the wrong value.
> The matching code just below already does it the right way (adds the two
> updates), which shows this was a typo.
> The fix is a single line: start from the first update instead of the second.
> This is the same kind of one-line correctness fix as SPARK-6710.
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