[jira] [Commented] (MADLIB-951) Elastic net - support column names instead of an array for features

["Rahul Iyer (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MADLIB-951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15517965#comment-15517965 ] 

Rahul Iyer commented on MADLIB-951:
-----------------------------------

This feature (of inputing comma-separated list of columns) made sense in decision trees since the features are used independently in the tree. For the elastic net, we'll always need an array of feature instances. Hence to maintain backwards compatibility, we can: 

* Accept another parameter from the user which is a comma-separated list of output column names. 
* Parse the array input to see if we can get the columns names (will work in common use-case i.e. input being {{array\[feat1, feat2, ...., featn\]}} )
* Do both. 

> Elastic net - support column names instead of an array for features
> -------------------------------------------------------------------
>
>                 Key: MADLIB-951
>                 URL: https://issues.apache.org/jira/browse/MADLIB-951
>             Project: Apache MADlib
>          Issue Type: Improvement
>          Components: Module: Regularized Regression
>            Reporter: Frank McQuillan
>            Priority: Minor
>             Fix For: v2.0
>
>         Attachments: screenshot-1.png
>
>
> From a user:
> One usability issue: when you are displaying the results how come you give the index of the features ? why not the feature name? 



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