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From Ted Dunning <ted.dunn...@gmail.com>
Subject Re: [jira] [Commented] (MAHOUT-668) Adding knn support to Mahout classifiers
Date Sun, 22 May 2011 04:35:18 GMT
On Sat, May 21, 2011 at 6:07 PM, Daniel McEnnis (JIRA) <jira@apache.org>wrote:

>
>    [
> https://issues.apache.org/jira/browse/MAHOUT-668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13037490#comment-13037490]
>
>
> Your right.  The distance metrics will have trouble with Random Vectors.
>  I'll work on a fix for that.  (The code is on the critical path, I can't
> afford to lose the speed of the current method and the other vector methods
> give incorrect results for missing=0 vectors)
>

Sparse vectors in Mahout assume that missing elements are 0.

Are you saying that you want to consider missing elements as something other
than 0?  Your javadoc didn't seem to say that.

You should get the same results either way.

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