[jira] [Updated] (MAHOUT-1140) Uniform random sampling problem in RandomSeedGenerator.java

["sam wu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAHOUT-1140?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

sam wu updated MAHOUT-1140:
---------------------------

    Attachment: TestUniformRandomSample.java

test uniform sampling
                
> Uniform random sampling problem in RandomSeedGenerator.java
> -----------------------------------------------------------
>
>                 Key: MAHOUT-1140
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1140
>             Project: Mahout
>          Issue Type: New Feature
>          Components: Clustering
>    Affects Versions: 0.8
>         Environment: all platform, generic
>            Reporter: sam wu
>            Priority: Minor
>              Labels: features
>             Fix For: 0.8
>
>         Attachments: TestUniformRandomSample.java
>
>   Original Estimate: 4h
>  Remaining Estimate: 4h
>
> Uniform random sampling in RandomSeedGenerator.java is buggy. The selected samplings will be highly toward ending samples, eg: sample size=1000, k=3, almost all selected samples will be >=980th sample. 
> This problem also exists in MiA code, ch09 at RandomPointUtils.java, chooseRandomPoints() method.

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