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https://issues.apache.org/jira/browse/MAHOUT-1601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14089344#comment-14089344
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Frank Rosner commented on MAHOUT-1601:
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I added some JavaDoc to DummySimilarity. It is just a dummy implementation of 
the interface for test purposes, it seems.

I believe that {{GenericUserSimilarity}} is some kind of wrapper for a 
similarity matrix. The matrix is stored inside a map of maps by user IDs. 
Computing the similarity results in a lookup in that matrix. What do you think, 
[~harishjira]?

Unfortunately there are no tests for the measures.

> Add javadoc for the classes - as there is no clue what the class is for .
> -------------------------------------------------------------------------
>
>                 Key: MAHOUT-1601
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1601
>             Project: Mahout
>          Issue Type: Documentation
>          Components: Documentation
>            Reporter: Harish Kayarohanam
>            Priority: Minor
>              Labels: documentation
>
> I found that the following classes 
> org.apache.mahout.cf.taste.impl.neighborhood.DummySimilarity
> org.apache.mahout.cf.taste.impl.similarity.GenericUserSimilarity
> org.apache.mahout.cf.taste.impl.similarity.LogLikelihoodSimilarity
> did not have java doc . So I was unable to find what these classes are for .
> Shall we add java doc for the same ?



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