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https://issues.apache.org/jira/browse/MADLIB-1205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16548367#comment-16548367
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ASF GitHub Bot commented on MADLIB-1205:
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Github user asfgit closed the pull request at:
https://github.com/apache/madlib/pull/289
> Add gini importance to DT
> -------------------------
>
> Key: MADLIB-1205
> URL: https://issues.apache.org/jira/browse/MADLIB-1205
> Project: Apache MADlib
> Issue Type: New Feature
> Components: Module: Decision Tree, Module: Random Forest
> Reporter: Rahul Iyer
> Assignee: Rahul Iyer
> Priority: Major
> Fix For: v1.15
>
>
> From the Breiman resource that we use for random forest:
> {quote}Gini importance
> {quote}
> {quote}Every time a split of a node is made on variable m the gini impurity
> criterion for the two descendent nodes is less than the parent node. Adding
> up the gini decreases for each individual variable over all trees in the
> forest gives a fast variable importance that is often very consistent with
> the permutation importance measure.
> {quote}
> We can add a similar measure in our DT code called as
> {{impurity_variable_importance}}.
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