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https://issues.apache.org/jira/browse/MAHOUT-1878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15429553#comment-15429553
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Pat Ferrel commented on MAHOUT-1878:
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see discussion here
https://issues.apache.org/jira/browse/MAHOUT-1853
> implement quartile type thresholds for indicator matrix downsampling
> --------------------------------------------------------------------
>
> Key: MAHOUT-1878
> URL: https://issues.apache.org/jira/browse/MAHOUT-1878
> Project: Mahout
> Issue Type: New Feature
> Components: Collaborative Filtering, cooccurrence
> Reporter: Pat Ferrel
> Assignee: Pat Ferrel
> Fix For: 1.0.0
>
>
> https://issues.apache.org/jira/browse/MAHOUT-1853
> second half of the above, see discussion of downsampling by fraction of
> matrix retained, perhaps using t-digest.
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