[jira] [Created] (SYSTEMML-1659) New rewrite eliminate unnecessary aggregates

["Matthias Boehm (JIRA)" <ji...@apache.org>]

Matthias Boehm created SYSTEMML-1659:
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             Summary: New rewrite eliminate unnecessary aggregates
                 Key: SYSTEMML-1659
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1659
             Project: SystemML
          Issue Type: Sub-task
            Reporter: Matthias Boehm


There are some example scripts which use unnecessary aggregations for convenience of a consistent specification - hence, we should automatically eliminate these unnecessary aggregates, via a simple static rewrite.

{code}
 # nn lib - cross_entropy_loss::forward (returns only loss)
 N = nrow(y)
 eps = 1e-10  # numerical stability to avoid log(0)
 losses = rowSums(-y * log(pred+eps))
 loss = sum(losses) / N
{code}



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