[jira] [Commented] (SPARK-5888) Add OneHotEncoder as a Transformer

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-5888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14493302#comment-14493302 ] 

Apache Spark commented on SPARK-5888:
-------------------------------------

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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