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https://issues.apache.org/jira/browse/MAHOUT-843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13166646#comment-13166646
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Jeff Eastman commented on MAHOUT-843:
-------------------------------------

I fixed the duplication.

On the wiki page,it states that "So, all clustering algorithms available in 
Mahout, other than the MinHash Clustering algorithm ( which is a "Bottom Up" 
Clustering Algorithm ), are suitable...). I don't believe this is true. Seems 
to me that any clustering algorithm should be usable in either/any step. Any 
clustering algorithm which operates upon Vectors and produces 
WeightedVectorWritables can be used. Isn't that the real criteria?

Finally, it would be nice to see a CLI example ;-)
                
> Top Down Clustering
> -------------------
>
>                 Key: MAHOUT-843
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-843
>             Project: Mahout
>          Issue Type: New Feature
>          Components: Clustering
>    Affects Versions: 0.6
>            Reporter: Paritosh Ranjan
>            Assignee: Jeff Eastman
>              Labels: clustering, patch
>             Fix For: 0.6
>
>         Attachments: MAHOUT-843-patch, MAHOUT-843-patch-only-postprocessor, 
> MAHOUT-843-patch-only-postprocessor-final, 
> MAHOUT-843-patch-only-postprocessor-v1, 
> MAHOUT-843-patch-only-postprocessor-v2, 
> MAHOUT-843-patch-only-postprocessor-v3, 
> MAHOUT-843-patch-only-postprocessor-v4, 
> MAHOUT-843-patch-only-postprocessor-v5, MAHOUT-843-patch-v1, 
> Top-Down-Clustering-patch
>
>
> Top Down Clustering works in multiple steps. The first step is to find 
> comparative bigger clusters. The second step is to cluster the bigger chunks 
> into meaningful clusters. This can performance while clustering big amount of 
> data. And, it also removes the dependency of providing input clusters/numbers 
> to the clustering algorithm.
> The "big" is a relative term, as well as the smaller "meaningful" terms. So, 
> the control of this "bigger" and "smaller/meaningful" clusters will be 
> controlled by the user.
> Which clustering algorithm to be used in the top level and which to use in 
> the bottom level can also be selected by the user. Initially, it can be done 
> for only one/few clustering algorithms, and later, option can be provided to 
> use all the algorithms ( which suits the case ). 

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