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Xusen Yin commented on SPARK-5894:
----------------------------------
I want to write the polynomial expansion. Pls assign it to me.
> Add PolynomialMapper
> --------------------
>
> Key: SPARK-5894
> URL: https://issues.apache.org/jira/browse/SPARK-5894
> Project: Spark
> Issue Type: Sub-task
> Components: ML
> Reporter: Xiangrui Meng
>
> `PolynomialMapper` takes a vector column and outputs a vector column with polynomial
feature mapping.
> {code}
> val poly = new PolynomialMapper()
> .setInputCol("features")
> .setDegree(2)
> .setOutputCols("polyFeatures")
> {code}
> It should handle the output feature names properly. Maybe we can make a better name for
it instead of calling it `PolynomialMapper`.
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