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From "Nick Wellnhofer (JIRA)" <j...@apache.org>
Subject [lucy-issues] [jira] [Created] (LUCY-272) Wrong encoding of extremely small similarity values
Date Sun, 19 Oct 2014 16:24:33 GMT
Nick Wellnhofer created LUCY-272:
------------------------------------

             Summary: Wrong encoding of extremely small similarity values
                 Key: LUCY-272
                 URL: https://issues.apache.org/jira/browse/LUCY-272
             Project: Lucy
          Issue Type: Bug
          Components: Index
            Reporter: Nick Wellnhofer
            Assignee: Nick Wellnhofer


Due to a missing range check, values smaller than 2^-31 are encoded as 255 and in Sim#Encode_Norm
and subsequently decoded as approximately 2^31. Such small values are probably rare but this
could cause significant errors when calculating similarities.



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