Matthias Boehm created SYSTEMML-2161:

             Summary: Suboptimal codegen plans for ALS due to wrong cost model 
                 Key: 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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