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https://issues.apache.org/jira/browse/LUCENE-3357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13082859#comment-13082859
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Robert Muir commented on LUCENE-3357:
-------------------------------------
For the negative in the IF model, one solution is this:
{noformat}
- return tfn * (float)(log2((N + 1) / (F + 0.5)));
+ return tfn * (float)(log2(1 + (N + 1) / (F + 0.5)));
{noformat}
in quick relevance tests, this was slightly better (likely not significant
either way).
> 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, 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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