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https://issues.apache.org/jira/browse/SPARK-4588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14349907#comment-14349907
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Apache Spark commented on SPARK-4588:
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User 'mengxr' has created a pull request for this issue:
https://github.com/apache/spark/pull/4925
> 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
> Priority: Critical
>
> 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.
> The design doc is available at
> https://docs.google.com/document/d/1796XfSzFbZvGWFs0ky99AJhlqkOBRG1O2bUxK2N4Grk/edit?usp=sharing
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