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https://issues.apache.org/jira/browse/SPARK-13641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15196765#comment-15196765
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Xusen Yin commented on SPARK-13641:
-----------------------------------
[~muralidh] I gonna close this JIRA since I find that it is intended to do so
by One-hot encoder to index discrete feature.
> getModelFeatures of ml.api.r.SparkRWrapper cannot (always) reveal the
> original column names
> -------------------------------------------------------------------------------------------
>
> Key: SPARK-13641
> URL: https://issues.apache.org/jira/browse/SPARK-13641
> Project: Spark
> Issue Type: Bug
> Components: ML, SparkR
> Reporter: Xusen Yin
> Priority: Minor
>
> getModelFeatures of ml.api.r.SparkRWrapper cannot (always) reveal the
> original column names. Let's take the HouseVotes84 data set as an example:
> {code}
> case m: XXXModel =>
> val attrs = AttributeGroup.fromStructField(
> m.summary.predictions.schema(m.summary.featuresCol))
> attrs.attributes.get.map(_.name.get)
> {code}
> The code above gets features' names from the features column. Usually, the
> features column is generated by RFormula. The latter has a VectorAssembler in
> it, which leads the output attributes not equal with the original ones.
> E.g., we want to learn the HouseVotes84's features' name "V1, V2, ..., V16".
> But with RFormula, we can only get "V1_n, V2_y, ..., V16_y" because [the
> transform function of
> VectorAssembler|https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/ml/feature/VectorAssembler.scala#L75]
> adds salts of the column names.
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