[jira] [Commented] (LUCENE-5258) add distance function to expressions/

classic Classic list List threaded Threaded
1 message Options
Reply | Threaded
Open this post in threaded view
|

[jira] [Commented] (LUCENE-5258) add distance function to expressions/

Michael Gibney (Jira)

    [ https://issues.apache.org/jira/browse/LUCENE-5258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13789046#comment-13789046 ]

Uwe Schindler commented on LUCENE-5258:
---------------------------------------

bq. I also tested with Math.cos and Math.asin and find that haversin runs almost twice faster if you avoid the fancy "fast" math stuff (at least on my laptop). The actual times are about 1.6 microseconds versus about .85 microseconds. Your mileage will vary on micro-benchmarks, of course.

Laptop with smaller CPU cache?

> add distance function to expressions/
> -------------------------------------
>
>                 Key: LUCENE-5258
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5258
>             Project: Lucene - Core
>          Issue Type: New Feature
>          Components: modules/other
>            Reporter: Robert Muir
>             Fix For: 5.0, 4.6
>
>         Attachments: LUCENE-5258.patch
>
>
> Adding this static function makes it really easy to incorporate distance with the score or other signals in arbitrary ways, e.g. score / (1 + log(distance)) or whatever.



--
This message was sent by Atlassian JIRA
(v6.1#6144)

---------------------------------------------------------------------
To unsubscribe, e-mail: [hidden email]
For additional commands, e-mail: [hidden email]