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https://issues.apache.org/jira/browse/SPARK-4588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14311586#comment-14311586
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Apache Spark commented on SPARK-4588:
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User 'srowen' has created a pull request for this issue:
https://github.com/apache/spark/pull/4460
> Add API for feature attributes
> ------------------------------
>
> Key: SPARK-4588
> URL: https://issues.apache.org/jira/browse/SPARK-4588
> Project: Spark
> Issue Type: Sub-task
> Components: ML, MLlib
> Reporter: Xiangrui Meng
> Assignee: Sean Owen
>
> Feature attributes, e.g., continuous/categorical, feature names, feature
> dimension, number of categories, number of nonzeros (support) could be useful
> for ML algorithms.
> In SPARK-3569, we added metadata to schema, which can be used to store
> feature attributes along with the dataset. We need to provide a wrapper over
> the Metadata class for ML usage.
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