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From Robert Muir <rcm...@gmail.com>
Subject Re: SweetSpotSimilarity
Date Tue, 06 Mar 2012 22:59:08 GMT
On Tue, Mar 6, 2012 at 5:57 PM, Paul Taylor <paul_t100@fastmail.fm> wrote:
>> Hello,
>>
>> what is previously Similarity in older releases is moved to
>> TFIDFSimilarity: it extends Similarity and exposes a vector-space API,
>> with its same formulas in the javadocs:
>>
>> https://builds.apache.org/view/G-L/view/Lucene/job/Lucene-trunk/javadoc/core/org/apache/lucene/search/similarities/TFIDFSimilarity.html
>>
> Looks good, do you know if this stuff will make it into 3.6 ?
>
> Paul

It won't (will have to be in 4.0) for two main reasons:

* The changes are fairly intrusive and would break API
backwards-compatibility everywhere.
* All of the added scoring systems require index statistics that are
new in Lucene 4.0

The last one being the biggest dealbreaker: and it would be difficult
to wedge into the Lucene 3.x implementation, because terms aren't
cleanly separated per-field, etc, etc.

-- 
lucidimagination.com

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