[
https://issues.apache.org/jira/browse/MAHOUT-688?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Grant Ingersoll updated MAHOUT-688:
-----------------------------------
Attachment: MAHOUT-688.patch
Reorgs the code a little bit to move std. dev. calculation to a common place.
Also, puts in tests for std. dev. and fixes the std. dev. calculation, which _I
am pretty sure_ was incorrectly calculated (it was missing the subtraction of
the average in the sum of squares calc). Also added license headers and cleaned
up the formatting a bit.
Since we are in code freeze, we can iterate on this a bit for 0.6.
> 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
> Assignee: Grant Ingersoll
> Priority: Minor
> Labels: Vectorization
> Fix For: 0.6
>
> Attachments: MAHOUT-688.patch, 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
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
