[jira] [Created] (MADLIB-1092) Elastic Net gives inconsistent results with grouping

["Nandish Jayaram (JIRA)" <ji...@apache.org>]

Nandish Jayaram created MADLIB-1092:
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             Summary: Elastic Net gives inconsistent results with grouping
                 Key: MADLIB-1092
                 URL: https://issues.apache.org/jira/browse/MADLIB-1092
             Project: Apache MADlib
          Issue Type: Bug
          Components: Module: Regularized Regression
            Reporter: Nandish Jayaram


Elastic net train seems to be giving incorrect results when used with grouping.

Steps:
- Run elastic net (train) on a table and obtain a model (M1). 
- Create a new table with all rows in the original input table and assign group value 1 for it.
- Replicate the rows in the table and assign group value 2 for the replicated rows.
- Run the elastic net train function with grouping while keeping the same optimization parameters for the function.

Result:
- The model (for each group) when run with grouping is different from the model M1.
- The model for both the groups is the same, but not same as M1.



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