[jira] [Created] (LUCENE-6654) KNearestNeighborClassifier not taking in consideration Class ranking

["Alessandro Benedetti (JIRA)" <ji...@apache.org>]

Alessandro Benedetti created LUCENE-6654:
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             Summary: 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
            Priority: Minor


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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