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https://issues.apache.org/jira/browse/SPARK-8457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14615628#comment-14615628
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Apache Spark commented on SPARK-8457:
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User 'feynmanliang' has created a pull request for this issue:
https://github.com/apache/spark/pull/7244
> Documentation for N-Gram feature transformer
> --------------------------------------------
>
> Key: SPARK-8457
> URL: https://issues.apache.org/jira/browse/SPARK-8457
> Project: Spark
> Issue Type: Documentation
> Components: ML
> Reporter: Feynman Liang
> Assignee: Feynman Liang
> Priority: Trivial
>
> Documentation for using n-gram feature transformer needs to be written. In
> particular, we need to describe the input (ArrayType(StringType)) and output
> (ArrayType(ArrayType(StringType)) formats, nullability constraints (input is
> nullable, output is not) and behaviors (null values are ignored in generating
> n-grams), as well as edge cases (e.g. n-gram length > input sequence length
> will yield a single output n-gram equal to the input sequence).
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