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https://issues.apache.org/jira/browse/LUCENE-3357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13082303#comment-13082303
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Robert Muir commented on LUCENE-3357:
-------------------------------------
Ok, here is what i did here for BM25:
in the case norms are omitted by the user, the formula behaves as if b=0 (no
length normalization). so this is always a possibility sims should handle,
thoguh for EasySimilarity perhaps it should just supply doclen=1 or something
of that nature?
in the case norms are available, but sumTotalTermFreq is not (e.g. frequencies
are omitted by the user), I use a value of 1 for avg doc len... This is
probably ok
since in the case of omitTF all the TF values will be 1 anyway.
> Unit and integration test cases for the new Similarities
> --------------------------------------------------------
>
> Key: LUCENE-3357
> URL: https://issues.apache.org/jira/browse/LUCENE-3357
> Project: Lucene - Java
> Issue Type: Sub-task
> Components: core/query/scoring
> Affects Versions: flexscoring branch
> Reporter: David Mark Nemeskey
> Assignee: David Mark Nemeskey
> Priority: Minor
> Labels: gsoc, gsoc2011, test
> Fix For: flexscoring branch
>
> Attachments: LUCENE-3357.patch, LUCENE-3357.patch, LUCENE-3357.patch,
> LUCENE-3357.patch, LUCENE-3357.patch, LUCENE-3357.patch, LUCENE-3357.patch,
> LUCENE-3357.patch
>
>
> Write test cases to test the new Similarities added in
> [LUCENE-3220|https://issues.apache.org/jira/browse/LUCENE-3220]. Two types of
> test cases will be created:
> * unit tests, in which mock statistics are provided to the Similarities and
> the score is validated against hand calculations;
> * integration tests, in which a small collection is indexed and then
> searched using the Similarities.
> Performance tests will be performed in a separate issue.
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