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https://issues.apache.org/jira/browse/MAHOUT-1289?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sebastian Schelter resolved MAHOUT-1289.
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Resolution: Fixed
> Move downsampling code into RowSimilarityJob
> --------------------------------------------
>
> Key: MAHOUT-1289
> URL: https://issues.apache.org/jira/browse/MAHOUT-1289
> Project: Mahout
> Issue Type: Improvement
> Components: Math
> Reporter: Sebastian Schelter
> Assignee: Sebastian Schelter
> Fix For: 0.9
>
>
> When computing similarities with RowSimilarityJob, downsampling highly
> frequent things is crucial for performance. At the moment, this is done by
> the data preparation code for collaborative filtering.
> We should move the downsampling directly into RowSimilarityJob as we've seen
> a lot of cases where users want to directly use it.
> Furthermore, it should be possible to fix the random seed for the sampling to
> be able to conduct repeatable experiments.
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