spark-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Xusen Yin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-5895) Add VectorSlicer
Date Mon, 30 Mar 2015 08:13:53 GMT

    [ https://issues.apache.org/jira/browse/SPARK-5895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14386365#comment-14386365
] 

Xusen Yin commented on SPARK-5895:
----------------------------------

I have another concern here.

We can not reveal each column name of a `Vector`. Given the selected features "age" and "salary",
how to select these two columns from a vector? One solution is giving it a list of column
names, say, `setColumnNames(List[String])`. But a more natural way to solve it is adding the
list of column names in `VectorAssembler`. 

> Add VectorSlicer
> ----------------
>
>                 Key: SPARK-5895
>                 URL: https://issues.apache.org/jira/browse/SPARK-5895
>             Project: Spark
>          Issue Type: Sub-task
>          Components: ML
>            Reporter: Xiangrui Meng
>
> `VectorSlicer` takes a vector column and output a vector column with a subset of features.
> {code}
> val vs = new VectorSlicer()
>   .setInputCol("user")
>   .setSelectedFeatures("age", "salary")
>   .setOutputCol("usefulUserFeatures")
> {code}
> We should allow specifying selected features by indices and by names. It should preserve
the output names.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org


Mime
View raw message