Mailing List Archive: The current default similarity implementation of Lucene is BM25, right?

The current default similarity implementation of Lucene is BM25, right?

Nov 23, 2022, 1:52 AM

Post #1 of 4 (297 views)

Hi

On the Lucene FAQ there is no mentioning re tf-idf or bm25 and I would
like to add some notes, but to be sure I don't write anything wrong I
would like to ask

whether the current default similarity implementation of Lucene is
really BM25, right?

as described at

https://opensourceconnections.com/blog/2015/10/16/bm25-the-next-generation-of-lucene-relevation/

Thanks

Michael

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Re: The current default similarity implementation of Lucene is BM25, right? [ In reply to ]

jpountz at gmail

Nov 23, 2022, 1:55 AM

Post #2 of 4 (297 views)

Permalink

This is correct. See IndexSearcher#getDefaultSimilarity().

On Wed, Nov 23, 2022 at 10:53 AM Michael Wechner
<michael.wechner@wyona.com> wrote:
>
> Hi
>
> On the Lucene FAQ there is no mentioning re tf-idf or bm25 and I would
> like to add some notes, but to be sure I don't write anything wrong I
> would like to ask
>
> whether the current default similarity implementation of Lucene is
> really BM25, right?
>
> as described at
>
> https://opensourceconnections.com/blog/2015/10/16/bm25-the-next-generation-of-lucene-relevation/
>
> Thanks
>
> Michael
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> For additional commands, e-mail: java-user-help@lucene.apache.org
>

--
Adrien

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Re: The current default similarity implementation of Lucene is BM25, right? [ In reply to ]

michael.wechner at wyona

Nov 23, 2022, 1:58 AM

Post #3 of 4 (297 views)

Permalink

cool, thanks!

Am 23.11.22 um 10:55 schrieb Adrien Grand:
> This is correct. See IndexSearcher#getDefaultSimilarity().
>
> On Wed, Nov 23, 2022 at 10:53 AM Michael Wechner
> <michael.wechner@wyona.com> wrote:
>> Hi
>>
>> On the Lucene FAQ there is no mentioning re tf-idf or bm25 and I would
>> like to add some notes, but to be sure I don't write anything wrong I
>> would like to ask
>>
>> whether the current default similarity implementation of Lucene is
>> really BM25, right?
>>
>> as described at
>>
>> https://opensourceconnections.com/blog/2015/10/16/bm25-the-next-generation-of-lucene-relevation/
>>
>> Thanks
>>
>> Michael
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
>> For additional commands, e-mail: java-user-help@lucene.apache.org
>>
>

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Re: The current default similarity implementation of Lucene is BM25, right? [ In reply to ]

michael.wechner at wyona

Nov 23, 2022, 4:48 AM

Post #4 of 4 (297 views)

Permalink

I have enhanced the FAQ

https://cwiki.apache.org/confluence/display/LUCENE/LuceneFAQ#LuceneFAQ-Whatisthedefaultrelevance/similarityimplementationofLucene?

Hope it is ok like this :-)

Thanks

Michael

Am 23.11.22 um 10:58 schrieb Michael Wechner:
> cool, thanks!
>
> Am 23.11.22 um 10:55 schrieb Adrien Grand:
>> This is correct. See IndexSearcher#getDefaultSimilarity().
>>
>> On Wed, Nov 23, 2022 at 10:53 AM Michael Wechner
>> <michael.wechner@wyona.com> wrote:
>>> Hi
>>>
>>> On the Lucene FAQ there is no mentioning re tf-idf or bm25 and I would
>>> like to add some notes, but to be sure I don't write anything wrong I
>>> would like to ask
>>>
>>> whether the current default similarity implementation of Lucene is
>>> really BM25, right?
>>>
>>> as described at
>>>
>>> https://opensourceconnections.com/blog/2015/10/16/bm25-the-next-generation-of-lucene-relevation/
>>>
>>>
>>> Thanks
>>>
>>> Michael
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
>>> For additional commands, e-mail: java-user-help@lucene.apache.org
>>>
>>
>
>
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> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> For additional commands, e-mail: java-user-help@lucene.apache.org
>

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