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From "Ankur (Commented) (JIRA)" <>
Subject [jira] [Commented] (MAHOUT-344) Minhash based clustering
Date Tue, 08 Nov 2011 11:00:51 GMT


Ankur commented on MAHOUT-344:

Grant, The idea behind keyGroups is to concatenate hashes from multiple hash functions reduce
the probability of collision between 2 users that agreed on 1 or more individual hash values.
This essentially improves the average similarity of users in a cluster.

About documentation, I am caught up with a few urgent issues at work and will need more time.
Hope to get some free cycles before end of this week.   
> Minhash based clustering 
> -------------------------
>                 Key: MAHOUT-344
>                 URL:
>             Project: Mahout
>          Issue Type: Bug
>          Components: Clustering
>    Affects Versions: 0.3
>            Reporter: Ankur
>            Assignee: Ankur
>             Fix For: 0.4
>         Attachments: MAHOUT-344-v1.patch, MAHOUT-344-v2.patch, MAHOUT-344-v3.patch, MAHOUT-344-v4.patch,
MAHOUT-344-v5.patch, MAHOUT-344-v6.patch, MAHOUT-344-v7.patch
> Minhash clustering performs probabilistic dimension reduction of high dimensional data.
The essence of the technique is to hash each item using multiple independent hash functions
such that the probability of collision of similar items is higher. Multiple such hash tables
can then be constructed  to answer near neighbor type of queries efficiently.

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