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https://issues.apache.org/jira/browse/MAHOUT-463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12897678#action_12897678
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Hui Wen Han edited comment on MAHOUT-463 at 8/12/10 6:31 AM:
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Sorry DistributedUncenteredZeroAssumingCosineVectorSimilarity does not always
return 1.
If n users like ItemA, m users like ItemB,p users like both ItemA and ItemB,
DistributedUncenteredZeroAssumingCosineVectorSimilarity return p/(m*n).
it also can use for Boolean data, but we can provide a simple one , return
(p*p)/(m*n),no so much computing.
was (Author: huiwenhan):
Sorry DistributedUncenteredZeroAssumingCosineVectorSimilarity does not
always return 1.
If n users like ItemA, m users like ItemB,p users like both ItemA and ItemB,
DistributedUncenteredZeroAssumingCosineVectorSimilarity return p/m*n.
it also can use for Boolean data, but we can provide a simple one , return
p*p/m*n,no so much computing.
> 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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