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https://issues.apache.org/jira/browse/LUCENE-7156?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tommaso Teofili resolved LUCENE-7156.
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Resolution: Fixed
> Wrong accuracy and precision calculations in confusion matrix
> -------------------------------------------------------------
>
> Key: LUCENE-7156
> URL: https://issues.apache.org/jira/browse/LUCENE-7156
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/classification
> Affects Versions: 5.5, 6.0
> Reporter: Tommaso Teofili
> Assignee: Tommaso Teofili
> Fix For: 6.1
>
>
> {{ConfusionMatrix#getPrecision}} has false positives counter wrongly
> initialized to _- classes.size()_ and {{ConfusionMatrix#getAccuracy}} doesn't
> take into account false negatives and true negatives therefore resulting in
> returning recall.
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