Matthias Boehm created SYSTEMML-1369:
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Summary: Loop vectorization rewrite for indexed copies
Key: SYSTEMML-1369
URL: https://issues.apache.org/jira/browse/SYSTEMML-1369
Project: SystemML
Issue Type: Sub-task
Reporter: Matthias Boehm
For complex models, users often have to resort to a task-parallel parfor
implementation because it's not easily expressed in vectorized form. In this
context, we often encounter indexed copies that could have been easily
vectorized. For example, the below snippet stems from a recent benchmark
comparison against SystemML, which implemented Hidden Markov Model learning:
{code}
parfor (i in 1:ncol(labels)) {
topics[id, i] = labels[1, i]
}
{code}
This task aims to automatically rewrite such loops into vectorized form - for
above example into {{topics[id, 1:ncol(labels)] = labels[1, 1:ncol(labels)]}},
where the unnecessary right indexing is subsequently remove by following HOP
rewrites.
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