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From "Alessandro Benedetti (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-6654) KNearestNeighborClassifier not taking in consideration Class ranking
Date Mon, 03 Aug 2015 09:50:07 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-6654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14651678#comment-14651678
] 

Alessandro Benedetti commented on LUCENE-6654:
----------------------------------------------

To make it simple, using this patch before should not cause any conflict,  if we keep not
protected here( which is better for patch isolation) later a small merge will happen, 
Which of.course is not a problem!  :)

> KNearestNeighborClassifier not taking in consideration Class ranking
> --------------------------------------------------------------------
>
>                 Key: LUCENE-6654
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6654
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/classification
>    Affects Versions: 5.2.1
>            Reporter: Alessandro Benedetti
>            Assignee: Tommaso Teofili
>            Priority: Minor
>              Labels: classification, knn
>         Attachments: LUCENE-6654.patch
>
>
> Currently the KNN Classifier assign the score for a ClassificationResult, based only
on the frequency of the class in the top K results.
> This is conceptually a simplification.
> Actually the ranking must take a part.
> If not this can happen :
> Top 4
> 1) Class1
> 2) Class1
> 3) Class2
> 4) Class2
> As a result of this Top 4 , both the classes will have the same score.
> But the expected result is that Class1 has a better score, as the MLT score the documents
accordingly.



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