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Posted to issues@lucy.apache.org by "Nick Wellnhofer (JIRA)" <ji...@apache.org> on 2014/10/19 20:22:33 UTC

[lucy-issues] [jira] [Commented] (LUCY-272) Wrong encoding of extremely small similarity values

    [ https://issues.apache.org/jira/browse/LUCY-272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14176375#comment-14176375 ] 

Nick Wellnhofer commented on LUCY-272:
--------------------------------------

Also fixed in 0.4 branch.

> 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
>             Fix For: 0.3.4, 0.4.2
>
>
> 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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