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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SYSTEMML-2293) Parfor w/ reused data partitioning causes diverging results
Date Mon, 30 Apr 2018 20:38:00 GMT
Matthias Boehm created SYSTEMML-2293:
----------------------------------------

             Summary: Parfor w/ reused data partitioning causes diverging results
                 Key: SYSTEMML-2293
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-2293
             Project: SystemML
          Issue Type: Bug
            Reporter: Matthias Boehm


For a special case of the following parfor structure, we see diverging results with and without
parfor data partitioning which are reused across the while loop iterations.

{code}
while(...) {
   parfor(...) {
       Xi = X[i,] #reused row-wise partitioning
   }

   parfor(...) {
       Xj = X[,j] #reused col-wise partitioning
   }
}
{code}



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