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Posted to dev@mahout.apache.org by "sam wu (JIRA)" <ji...@apache.org> on 2013/01/13 23:50:12 UTC

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

sam wu created MAHOUT-1140:
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             Summary: 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
             Fix For: 0.8


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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