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Posted to dev@lucene.apache.org by "Adrien Grand (JIRA)" <ji...@apache.org> on 2016/10/26 15:03:58 UTC

[jira] [Updated] (LUCENE-7524) More detailed explanation of idf

     [ https://issues.apache.org/jira/browse/LUCENE-7524?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adrien Grand updated LUCENE-7524:
---------------------------------
    Attachment: LUCENE-7524.patch

Here is a patch that enhances the explanations for BM25Similarity and ClassicSimilarity.

> More detailed explanation of idf
> --------------------------------
>
>                 Key: LUCENE-7524
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7524
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Priority: Minor
>         Attachments: LUCENE-7524.patch
>
>
> The explanations of idf give the docCount and docFreq, but they do not say how the idf is computed even though the formula is different eg. for ClassicSimilarity and BM25Similarity. Maybe it would help to put the formula in the explanations?



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