[jira] Created: (MAHOUT-141) Cluster Centroid improperly reported when no points associated w/ the cluster

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[jira] Created: (MAHOUT-141) Cluster Centroid improperly reported when no points associated w/ the cluster

Tim Allison (Jira)
Cluster Centroid improperly reported when no points associated w/ the cluster
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                 Key: MAHOUT-141
                 URL: https://issues.apache.org/jira/browse/MAHOUT-141
             Project: Mahout
          Issue Type: Bug
          Components: Clustering
            Reporter: Grant Ingersoll
            Assignee: Grant Ingersoll


Per the discussion at http://www.lucidimagination.com/search/document/5d54bb4822354bee/kmeans_help#48571ce2f5014a1f, the Cluster class returns pointTotal as the centroid (center) of a Cluster with zero points, which is not correct.  It should return the Center as the centroid in this case.

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[jira] Updated: (MAHOUT-141) Cluster Centroid improperly reported when no points associated w/ the cluster

Tim Allison (Jira)

     [ https://issues.apache.org/jira/browse/MAHOUT-141?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen updated MAHOUT-141:
-----------------------------

             Priority: Minor  (was: Major)
    Affects Version/s: 0.1
        Fix Version/s: 0.3

Marking for 0.3 as it sounds like a small bug. Pinging this issue, still active?

> Cluster Centroid improperly reported when no points associated w/ the cluster
> -----------------------------------------------------------------------------
>
>                 Key: MAHOUT-141
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-141
>             Project: Mahout
>          Issue Type: Bug
>          Components: Clustering
>    Affects Versions: 0.1
>            Reporter: Grant Ingersoll
>            Assignee: Grant Ingersoll
>            Priority: Minor
>             Fix For: 0.3
>
>
> Per the discussion at http://www.lucidimagination.com/search/document/5d54bb4822354bee/kmeans_help#48571ce2f5014a1f, the Cluster class returns pointTotal as the centroid (center) of a Cluster with zero points, which is not correct.  It should return the Center as the centroid in this case.

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[jira] Commented: (MAHOUT-141) Cluster Centroid improperly reported when no points associated w/ the cluster

Tim Allison (Jira)
In reply to this post by Tim Allison (Jira)

    [ https://issues.apache.org/jira/browse/MAHOUT-141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12789665#action_12789665 ]

Drew Farris commented on MAHOUT-141:
------------------------------------

For the case of computeCentriod() in the kmeans package it appears to be resolved. It doesn't appear to be a problem in the canopy, fuzzykmeans or meanshift packages either, but even if it were it should probably be treated as a separate issue.

> Cluster Centroid improperly reported when no points associated w/ the cluster
> -----------------------------------------------------------------------------
>
>                 Key: MAHOUT-141
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-141
>             Project: Mahout
>          Issue Type: Bug
>          Components: Clustering
>    Affects Versions: 0.1
>            Reporter: Grant Ingersoll
>            Assignee: Grant Ingersoll
>            Priority: Minor
>             Fix For: 0.3
>
>
> Per the discussion at http://www.lucidimagination.com/search/document/5d54bb4822354bee/kmeans_help#48571ce2f5014a1f, the Cluster class returns pointTotal as the centroid (center) of a Cluster with zero points, which is not correct.  It should return the Center as the centroid in this case.

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[jira] Resolved: (MAHOUT-141) Cluster Centroid improperly reported when no points associated w/ the cluster

Tim Allison (Jira)
In reply to this post by Tim Allison (Jira)

     [ https://issues.apache.org/jira/browse/MAHOUT-141?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen resolved MAHOUT-141.
------------------------------

    Resolution: Fixed

> Cluster Centroid improperly reported when no points associated w/ the cluster
> -----------------------------------------------------------------------------
>
>                 Key: MAHOUT-141
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-141
>             Project: Mahout
>          Issue Type: Bug
>          Components: Clustering
>    Affects Versions: 0.1
>            Reporter: Grant Ingersoll
>            Assignee: Grant Ingersoll
>            Priority: Minor
>             Fix For: 0.3
>
>
> Per the discussion at http://www.lucidimagination.com/search/document/5d54bb4822354bee/kmeans_help#48571ce2f5014a1f, the Cluster class returns pointTotal as the centroid (center) of a Cluster with zero points, which is not correct.  It should return the Center as the centroid in this case.

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