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https://issues.apache.org/jira/browse/SPARK-5888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14493302#comment-14493302
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Apache Spark commented on SPARK-5888:
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User 'sryza' has created a pull request for this issue:
https://github.com/apache/spark/pull/5500
> Add OneHotEncoder as a Transformer
> ----------------------------------
>
> Key: SPARK-5888
> URL: https://issues.apache.org/jira/browse/SPARK-5888
> Project: Spark
> Issue Type: Sub-task
> Components: ML
> Reporter: Xiangrui Meng
> Assignee: Sandy Ryza
>
> `OneHotEncoder` takes a categorical column and output a vector column, which
> stores the category info in binaries.
> {code}
> val ohe = new OneHotEncoder()
> .setInputCol("countryIndex")
> .setOutputCol("countries")
> {code}
> It should read the category info from the metadata and assign feature names
> properly in the output column. We need to discuss the default naming scheme
> and whether we should let it process multiple categorical columns at the same
> time.
> One category (the most frequent one) should be removed from the output to
> make the output columns linear independent. Or this could be an option tuned
> on by default.
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