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From Robert Muir <rcm...@gmail.com>
Subject Re: idf calculation in Lucene ?
Date Mon, 31 Oct 2011 21:30:07 GMT
yes: override that method idfExplain(java.util.Collection,
org.apache.lucene.search.Searcher)

On Mon, Oct 31, 2011 at 5:24 PM, David Ryan <helponr@gmail.com> wrote:
> Thanks!  Is there any way to extend the Similarity class to overwrite the
> behavior (e.g.,  using the max idf instead of the sum of each term idfs)?
>
>
> On Thu, Oct 27, 2011 at 5:41 AM, Robert Muir <rcmuir@gmail.com> wrote:
>
>> On Thu, Oct 20, 2011 at 3:11 PM, David Ryan <helponr@gmail.com> wrote:
>>
>> >
>> > However, in some case,  when I search o'reilly ,  I see
>> >
>> >  *  44.0865 = idf(title: o''reilli=4 o=1488 reilli=14 oreilli=4)*
>> >
>> > In this cae, How is IDF calculated?
>> >
>>
>> thats a phrase or multiphrase query.
>>
>> in this case it sums up the idf of each term:
>>
>> http://lucene.apache.org/java/3_4_0/api/all/org/apache/lucene/search/Similarity.html#idfExplain(java.util.Collection
>> ,
>> org.apache.lucene.search.Searcher)
>>
>> --
>> lucidimagination.com
>>
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>>
>



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