[jira] [Updated] (SPARK-8457) Documentation for N-Gram feature transformer

["Joseph K. Bradley (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-8457?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joseph K. Bradley updated SPARK-8457:
-------------------------------------
            Assignee: Feynman Liang
    Target Version/s: 1.5.0

> 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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