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https://issues.apache.org/jira/browse/SPARK-8457?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joseph K. Bradley resolved SPARK-8457.
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Resolution: Fixed
Fix Version/s: 1.5.0
Issue resolved by pull request 7244
[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
> Fix For: 1.5.0
>
>
> 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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