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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2015/08/14 03:38:45 UTC

[jira] [Commented] (SPARK-8473) Documentation for DCT

    [ https://issues.apache.org/jira/browse/SPARK-8473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14696308#comment-14696308 ] 

Apache Spark commented on SPARK-8473:
-------------------------------------

User 'feynmanliang' has created a pull request for this issue:
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
>
> 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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