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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