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From "Joseph K. Bradley (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SPARK-5021) GaussianMixtureEM should be faster for SparseVector input
Date Tue, 30 Dec 2014 21:00:13 GMT
Joseph K. Bradley created SPARK-5021:
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             Summary: 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


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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