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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