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Posted to dev@mahout.apache.org by "Vasil Vasilev (JIRA)" <ji...@apache.org> on 2011/05/05 15:33:03 UTC
[jira] [Updated] (MAHOUT-688) High Document Frequency pruning for
seq2sparse
[ https://issues.apache.org/jira/browse/MAHOUT-688?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Vasil Vasilev updated MAHOUT-688:
---------------------------------
Attachment: MAHOUT-688.patch
High DF words pruning implementation
> High Document Frequency pruning for seq2sparse
> ----------------------------------------------
>
> Key: MAHOUT-688
> URL: https://issues.apache.org/jira/browse/MAHOUT-688
> Project: Mahout
> Issue Type: Improvement
> Reporter: Vasil Vasilev
> Priority: Minor
> Labels: Vectorization
> Attachments: MAHOUT-688.patch
>
>
> This improvement allows to prune the words with high document frequencies from the tf and tf-idf vectors produced by seq2sparse, based on the standard deviation of the words' document frequencies and specifying which rods to be pruned in a means of times this standard deviation. One good option is 3 times the standard deviation
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