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Posted to issues@spark.apache.org by "Sean R. Owen (Jira)" <ji...@apache.org> on 2020/01/14 14:28:02 UTC

[jira] [Resolved] (SPARK-9478) Add sample weights to Random Forest

     [ https://issues.apache.org/jira/browse/SPARK-9478?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean R. Owen resolved SPARK-9478.
---------------------------------
    Fix Version/s: 3.0.0
       Resolution: Fixed

> Add sample weights to Random Forest
> -----------------------------------
>
>                 Key: SPARK-9478
>                 URL: https://issues.apache.org/jira/browse/SPARK-9478
>             Project: Spark
>          Issue Type: Improvement
>          Components: ML
>    Affects Versions: 1.4.1
>            Reporter: Patrick Crenshaw
>            Assignee: zhengruifeng
>            Priority: Major
>             Fix For: 3.0.0
>
>
> Currently, this implementation of random forest does not support sample (instance) weights. Weights are important when there is imbalanced training data or the evaluation metric of a classifier is imbalanced (e.g. true positive rate at some false positive threshold).  Sample weights generalize class weights, so this could be used to add class weights later on.



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