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Posted to dev@mahout.apache.org by "Ted Dunning (JIRA)" <ji...@apache.org> on 2014/06/08 00:10:01 UTC

[jira] [Resolved] (MAHOUT-1575) Conjugate gradient assumes best case scenario for convergence

     [ https://issues.apache.org/jira/browse/MAHOUT-1575?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ted Dunning resolved MAHOUT-1575.
---------------------------------

    Resolution: Fixed

Committed small patch to allow 2 extra passes

> Conjugate gradient assumes best case scenario for convergence
> -------------------------------------------------------------
>
>                 Key: MAHOUT-1575
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1575
>             Project: Mahout
>          Issue Type: Bug
>            Reporter: Ted Dunning
>
> The conjugate gradient solve that we have assumes that it will converge within the theoretical n steps where n is the size of the input.  In fact, convergence may not happen within exactly that number of steps due to numerical issues so we should allow for a few extra iterations.



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