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https://issues.apache.org/jira/browse/SYSTEMML-2092?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm closed SYSTEMML-2092.
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Resolution: Done
Assignee: Matthias Boehm
Fix Version/s: SystemML 1.1
> Parfor result aggregation
> -------------------------
>
> Key: SYSTEMML-2092
> URL: https://issues.apache.org/jira/browse/SYSTEMML-2092
> Project: SystemML
> Issue Type: Task
> Reporter: Matthias Boehm
> Assignee: Matthias Boehm
> Priority: Major
> Fix For: SystemML 1.1
>
>
> So far, parfor loops only support left and right indexing operations over
> result variables. The related result merge then simply merges the partial
> worker results with or without compare matrix. However, there are many use
> cases that would benefit from additional result aggregation functions.
>
> This task aims to introduce a new {{R += A}} accumulator operation to address
> the above challenge. The semantics are equivalent to {{R = R + A}}, but the
> parfor dependency analysis will recognize this as a special aggregation
> function instead of throwing an error due to output dependencies.
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