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From "Michael Garski (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENENET-288) Function.TestCustomScoreQuery
Date Thu, 19 Nov 2009 01:07:39 GMT

    [ https://issues.apache.org/jira/browse/LUCENENET-288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12779781#action_12779781
] 

Michael Garski commented on LUCENENET-288:
------------------------------------------

A little more digging into this...

There are 4 tests in the class, TestCustomScoreByte, TestCustomScoreShort, TestCustomScoreint,
and TestCustomScoreFloat.  TestCustomScoreByte currently passes, but if a test case is added
to test with the dboost parameter to 3.0, it will fail.  All of the tests pass with a dboost
value of 2.0 or less, so this could be due to differences in how the Explanation score and
the scorer score are being calculated (the reason for the +-0.00005f variance in the Assert).

I'll be turning on the verbose output with FunctionTestSetup.DBG and comparing the output
between NUnit & Junit to verify that the root cause is a floating point arithmetic issue.

> Function.TestCustomScoreQuery
> -----------------------------
>
>                 Key: LUCENENET-288
>                 URL: https://issues.apache.org/jira/browse/LUCENENET-288
>             Project: Lucene.Net
>          Issue Type: Bug
>            Reporter: Michael Garski
>
> Three of the tests in TestCustomScoreQuery are not passing due to the comparison between
the explanation score and the hit score do not fall within the tolerance of +-0.00005f.  Altering
the tolerance to 0.0005f causes all of the tests to pass, so there appears to be a subtle
issue in how the scores are being calculated.
> A similar test exists in 2.4 that passes with the tolerance of 0.00005f, which to me
rules out floating point calculation differences.

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