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https://issues.apache.org/jira/browse/MAHOUT-463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12897636#action_12897636
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Hui Wen Han commented on MAHOUT-463:
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Because I set the prefValue=0 for Boolean Data ,
it may cause all similarityValue =0.
If we set the prefValue=1.0f for boolean data,
similarityValue of DistributedUncenteredZeroAssumingCosineVectorSimilarity will
be 1.0
other arithmetic also set similarityValue to 1.0
So the RowSimilarityJob does not make sense.
Maybe we need new similarity arithmetic for boolean data.
> Boolean Data can not get any recommendation by running RecommnenderJob
> ----------------------------------------------------------------------
>
> Key: MAHOUT-463
> URL: https://issues.apache.org/jira/browse/MAHOUT-463
> Project: Mahout
> Issue Type: Test
> Components: Collaborative Filtering
> Affects Versions: 0.4
> Reporter: Hui Wen Han
> Fix For: 0.4
>
> Attachments: MAHOUT-463-2.patch, MAHOUT-463.patch
>
>
> Boolean Preference Data can not get any recommendation by run RecommnenderJob,
> but It can get data using the build in about Aprl.
> It seems that it can not get any data by running RowSimilarityJob
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