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https://issues.apache.org/jira/browse/OAK-6317?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tommaso Teofili resolved OAK-6317.
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Resolution: Fixed
fixed in r1798035 (trunk).
> LMSEstimator update amount depending on cost amount
> ---------------------------------------------------
>
> Key: OAK-6317
> URL: https://issues.apache.org/jira/browse/OAK-6317
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: solr
> Affects Versions: 1.6.1, 1.7.1, 1.4.16, 1.2.26
> Reporter: Tommaso Teofili
> Assignee: Tommaso Teofili
> Fix For: 1.8
>
>
> {{LMSEstimator}} update rule implementation wrongly updates the weights
> taking the LMS cost value into account, this means that if the error is huge
> (and the cost quadratically grows with it) the weight could get an update
> value almost proportional to the LMS value (smoothed by learning rate alpha).
> The correct update rule should be used which only uses the residual.
> The side effect of this bug is that:
> * cost may vary a lot
> * weights could not converge to a good solution
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