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From "Xusen Yin (JIRA)" <>
Subject [jira] [Commented] (SPARK-5895) Add VectorSlicer
Date Mon, 30 Mar 2015 08:13:53 GMT


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:
>             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.

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