Matthias Boehm created SYSTEMML-2161:
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Summary: Suboptimal codegen plans for ALS due to wrong cost model
memoization
Key: SYSTEMML-2161
URL: https://issues.apache.org/jira/browse/SYSTEMML-2161
Project: SystemML
Issue Type: Bug
Reporter: Matthias Boehm
Due to a change from 1 to 0-based ID sequences in SystemML, there is a codegen
cost model memoization issue for special cases of the first cost vector per
optimization problem. For ALS-CG over amazon this has severe performance
implications causing a slowdown of more than 2x.
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