[ https://issues.apache.org/jira/browse/SPARK-8471?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-8471: ----------------------------------- Assignee: Apache Spark > Implement Discrete Cosine Transform feature transformer > ------------------------------------------------------- > > Key: SPARK-8471 > URL: https://issues.apache.org/jira/browse/SPARK-8471 > Project: Spark > Issue Type: New Feature > Components: ML > Reporter: Feynman Liang > Assignee: Apache Spark > Priority: Minor > > Discrete cosine transform (DCT) is an invertible matrix transformation > commonly used to analyze signals (e.g. audio, images, video) in the frequency > domain. In contrast to the FFT, the DCT maps real vectors to real vectors. > The DCT is oftentimes used to provide an alternative feature representation > (e.g. spectrogram representations of audio and video) useful for > classification and frequency-domain analysis. > Ideally, an implementation of the DCT should allow both forward and inverse > transforms. It should also work for any numeric datatype and 1,2, or 3 > dimensional data. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org