[jira] [Updated] (MAHOUT-803) Complete minsize constraints for similarity measures used in RowSimilarityJob

["Sebastian Schelter (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAHOUT-803?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sebastian Schelter updated MAHOUT-803:
--------------------------------------

    Fix Version/s: Backlog
    
> Complete minsize constraints for similarity measures used in RowSimilarityJob
> -----------------------------------------------------------------------------
>
>                 Key: MAHOUT-803
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-803
>             Project: Mahout
>          Issue Type: Task
>          Components: Math
>    Affects Versions: 0.6
>            Reporter: Sebastian Schelter
>            Assignee: Suneel Marthi
>             Fix For: Backlog
>
>
> The latest implementation of RowSimilarityJob allows specifying a threshold for the minimum similarity value of the resulting row pairs.
> A measure can specify a minsize constraints via VectorSimilarityMeasure.consider(...) to prune some candidate pairs very early by looking at some statistics computed for the single rows.
> For example if cooccurrence count is used as similarity measure and a threshold of 5 is set, then all row pairs where one of the vectors has less than 5 non-zero components can be discarded.
> These min-size constraints are still missing for CityBlockSimilarity, LoglikelihoodSimilarity and EuclideanDistanceSimilarity

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