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Posted to dev@mahout.apache.org by "Grant Ingersoll (JIRA)" <ji...@apache.org> on 2009/06/24 07:00:07 UTC

[jira] Resolved: (MAHOUT-77) DistanceMeasure calculation slow for SparseVector

     [ https://issues.apache.org/jira/browse/MAHOUT-77?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Grant Ingersoll resolved MAHOUT-77.
-----------------------------------

    Resolution: Won't Fix

See MAHOUT-139

> 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
>            Assignee: Grant Ingersoll
>            Priority: Minor
>             Fix For: 0.2
>
>         Attachments: sparse.patch, 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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