[jira] [Commented] (SPARK-3162) Train DecisionTree locally when possible

["Joseph K. Bradley (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-3162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15392788#comment-15392788 ] 

Joseph K. Bradley commented on SPARK-3162:
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Linking [SPARK-14043] since local training might be a good way to solve [SPARK-14043].  Local training might not need indices.

> Train DecisionTree locally when possible
> ----------------------------------------
>
>                 Key: SPARK-3162
>                 URL: https://issues.apache.org/jira/browse/SPARK-3162
>             Project: Spark
>          Issue Type: Improvement
>          Components: ML
>            Reporter: Joseph K. Bradley
>
> Improvement: communication
> Currently, every level of a DecisionTree is trained in a distributed manner.  However, at deeper levels in the tree, it is possible that a small set of training data will be matched with any given node.  If the node’s training data can fit on one machine’s memory, it may be more efficient to shuffle the data and do local training for the rest of the subtree rooted at that node.
> Note: It is possible that local training would become possible at different levels in different branches of the tree.  There are multiple options for handling this case:
> (1) Train in a distributed fashion until all remaining nodes can be trained locally.  This would entail training multiple levels at once (locally).
> (2) Train branches locally when possible, and interleave this with distributed training of the other branches.



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