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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SYSTEMML-2092) Parfor result aggregation
Date Sat, 27 Jan 2018 22:46:00 GMT
Matthias Boehm created SYSTEMML-2092:
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             Summary: Parfor result aggregation
                 Key: SYSTEMML-2092
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-2092
             Project: SystemML
          Issue Type: Task
            Reporter: Matthias Boehm


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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