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https://issues.apache.org/jira/browse/SPARK-19940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15923149#comment-15923149
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Maciej Szymkiewicz commented on SPARK-19940:
--------------------------------------------
cc [~yuhaoyan]
> FPGrowthModel.transform should skip duplicated items
> ----------------------------------------------------
>
> Key: SPARK-19940
> URL: https://issues.apache.org/jira/browse/SPARK-19940
> Project: Spark
> Issue Type: Bug
> Components: ML
> Affects Versions: 2.2.0
> Reporter: Maciej Szymkiewicz
> Priority: Minor
>
> Due to misplaced {{distinct}} {{FPGrowthModel.transform} generates duplicated
> items in the "prediction":
> {code}
> scala> val data =
> spark.read.text("data/mllib/sample_fpgrowth.txt").select(split($"value",
> "\\s+").alias("features"))
> data: org.apache.spark.sql.DataFrame = [features: array<string>]
> scala> val data =
> spark.read.text("data/mllib/sample_fpgrowth.txt").select(split($"value",
> "\\s+").alias("features"))
> data: org.apache.spark.sql.DataFrame = [features: array<string>]
> scala> fpm.transform(Seq(Array("t", "s")).toDF("features")).show(1, false)
> +--------+---------------------+
> |features|prediction |
> +--------+---------------------+
> |[t, s] |[y, x, z, x, y, x, z]|
> +--------+---------------------+
> {code}
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