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Posted to issues@spark.apache.org by "Joseph K. Bradley (JIRA)" <ji...@apache.org> on 2015/01/21 07:48:35 UTC

[jira] [Updated] (SPARK-5021) GaussianMixtureEM should be faster for SparseVector input

     [ https://issues.apache.org/jira/browse/SPARK-5021?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joseph K. Bradley updated SPARK-5021:
-------------------------------------
    Assignee: Manoj Kumar

> GaussianMixtureEM should be faster for SparseVector input
> ---------------------------------------------------------
>
>                 Key: SPARK-5021
>                 URL: https://issues.apache.org/jira/browse/SPARK-5021
>             Project: Spark
>          Issue Type: Improvement
>          Components: MLlib
>    Affects Versions: 1.2.0
>            Reporter: Joseph K. Bradley
>            Assignee: Manoj Kumar
>
> GaussianMixtureEM currently converts everything to dense vectors.  It would be nice if it were faster for SparseVectors (running in time linear in the number of non-zero values).
> However, this may not be too important since clustering should rarely be done in high dimensions.



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