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From Halácsy Péter <halacsy.pe...@axelero.com>
Subject RE: document & field boosting
Date Tue, 30 Jul 2002 08:28:49 GMT

it's amazing!

in september I'll implement our news archive where we try to score the documents based on
text relevancy and relative frequency of article's downloads/read (it's an e-magazine).

peter

> -----Original Message-----
> From: Doug Cutting [mailto:cutting@lucene.com]
> Sent: Monday, July 29, 2002 9:32 PM
> To: tinnes@ecliptictech.com; soshima@business.com;
> schrader.news@evendi.de; foo@welho.com; melissamifsud@yahoo.com
> Cc: Lucene Developers List
> Subject: document & field boosting
> 
> 
> FYI, I just added document and field boosting to Lucene.  It 
> should be 
> in tonight's nightly build.
> 
> This lets one, e.g., implement Google-like ranking, where a 
> factor in a 
> document's score is determined independently from the text of 
> the document.
> 
> Longer term, I'd still like to open up document scoring, so 
> that a user 
> can alter any part of the formula without altering Lucene's core code.
> 
> Enjoy!
> 
> Doug
> 
> -------- Original Message --------
> Subject: Re: cvs commit: 
> jakarta-lucene/src/test/org/apache/lucene/search TestDocBoost.java
> Date: Mon, 29 Jul 2002 12:14:22 -0700
> From: Doug Cutting <cutting@lucene.com>
> Reply-To: "Lucene Developers List" <lucene-dev@jakarta.apache.org>
> To: Lucene Developers List <lucene-dev@jakarta.apache.org>
> References: <20020729191115.42343.qmail@icarus.apache.org>
> 
> cutting@apache.org wrote:
>  >   Log:
>  >   msg.txt
> 
> Oops.  That log entry was supposed to read:
> 
>     Added support for boosting the score of documents and 
> fields via the
>     new methods Document.setBoost(float) and Field.setBoost(float).
> 
>     Note: This changes the encoding of an indexed value.  
> Indexes should
>     be re-created from scratch in order for search scores to 
> be correct.
>     With the new code and an old index, searches will yield very large
>     scores for shorter fields, and very small scores for 
> longer fields.
>     Once the index is re-created, scores will be as before.
> 
> Doug
> 
> 
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