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From "Allen Day (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAHOUT-77) DistanceMeasure calculation slow for SparseVector
Date Fri, 19 Sep 2008 18:34:44 GMT
DistanceMeasure calculation slow for SparseVector
-------------------------------------------------

                 Key: MAHOUT-77
                 URL: https://issues.apache.org/jira/browse/MAHOUT-77
             Project: Mahout
          Issue Type: Improvement
          Components: Matrix
            Reporter: Allen Day
            Priority: Minor
         Attachments: sparse.patch

ManhattanDistanceMeasure and TanimotoDistanceMeasure assume all vector indices up to cardinality()
must be compared.  We can speed this up for SparseVectors (and others) because Vector implements
Iterable, so we can consider only non-zero indices.

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