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https://issues.apache.org/jira/browse/SPARK-8473?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joseph K. Bradley resolved SPARK-8473.
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Resolution: Fixed
Fix Version/s: 1.5.0
Issue resolved by pull request 8184
[https://github.com/apache/spark/pull/8184]
> Documentation for DCT
> ---------------------
>
> Key: SPARK-8473
> URL: https://issues.apache.org/jira/browse/SPARK-8473
> Project: Spark
> Issue Type: Documentation
> Components: ML
> Reporter: Feynman Liang
> Assignee: Feynman Liang
> Priority: Minor
> Fix For: 1.5.0
>
>
> Documentation detailing the DCT feature transformer needs to be provided. In
> particular, we need to:
> - Describe how the implementation used scales the transform such that the
> representing matrix for the transform is unitary
> - Document how the frequency bins are arranged (e.g. index 0 corresponds to
> the DC offset). In MATLAB terminology, the implementation does not perform a
> fftshift after transforming.
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