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Posted to issues@spark.apache.org by "Xiayun Sun (JIRA)" <ji...@apache.org> on 2018/01/18 08:33:00 UTC
[jira] [Commented] (SPARK-22974) CountVectorModel does not attach
attributes to output column
[ https://issues.apache.org/jira/browse/SPARK-22974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16330235#comment-16330235 ]
Xiayun Sun commented on SPARK-22974:
------------------------------------
do we define the expected behavior here as Interaction of the occurrences?
`CountVectorizer` returns a `SparseVector`, for example, {{(3,[0,1,2],[1.0,1.0,1.0])}}
I think it's possible to attach numerical attribute to [1.0, 1.0, 1.0] then interaction will work.
> CountVectorModel does not attach attributes to output column
> ------------------------------------------------------------
>
> Key: SPARK-22974
> URL: https://issues.apache.org/jira/browse/SPARK-22974
> Project: Spark
> Issue Type: Bug
> Components: ML
> Affects Versions: 2.2.1
> Reporter: William Zhang
> Priority: Major
>
> If CountVectorModel transforms columns, the output column will not have attributes attached to them. If later on, those columns are used in Interaction transformer, an exception will be thrown:
> {quote}"org.apache.spark.SparkException: Vector attributes must be defined for interaction."
> {quote}
> To reproduce it:
> {quote}import org.apache.spark.ml.feature._
> import org.apache.spark.sql.functions._
> val df = spark.createDataFrame(Seq(
> (0, Array("a", "b", "c"), Array("1", "2")),
> (1, Array("a", "b", "b", "c", "a", "d"), Array("1", "2", "3"))
> )).toDF("id", "words", "nums")
> val cvModel: CountVectorizerModel = new CountVectorizer()
> .setInputCol("nums")
> .setOutputCol("features2")
> .setVocabSize(4)
> .setMinDF(0)
> .fit(df)
> ]val cvm = new CountVectorizerModel(Array("a", "b", "c"))
> .setInputCol("words")
> .setOutputCol("features1")
>
> val df1 = cvm.transform(df)
> val df2 = cvModel.transform(df1)
> val interaction = new Interaction().setInputCols(Array("features1", "features2")).setOutputCol("features")
> val df3 = interaction.transform(df2)
> {quote}
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