Re: [jira] Commented: (LUCENE-965) Implement a state-of-the-art retrieval function in Lucene

[Grant Ingersoll <gs...@apache.org>]

I don't think the original authors have followed up on this patch at  
all since first posting.

On Nov 27, 2008, at 6:44 AM, Ian Holsman (JIRA) wrote:

>
>    [ https://issues.apache.org/jira/browse/LUCENE-965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12651332 
> #action_12651332 ]
>
> Ian Holsman commented on LUCENE-965:
> ------------------------------------
>
> It's a bit late over here, but when I try to apply the patch it  
> doesn't seem to have the AXSimilarity class in it.
> is there a file missing here, or should i not be looking at applying  
> patches late at night?
>
>> Implement a state-of-the-art retrieval function in Lucene
>> ---------------------------------------------------------
>>
>>                Key: LUCENE-965
>>                URL: https://issues.apache.org/jira/browse/LUCENE-965
>>            Project: Lucene - Java
>>         Issue Type: Improvement
>>         Components: Search
>>   Affects Versions: 2.2
>>           Reporter: Hui Fang
>>            Fix For: 3.0
>>
>>        Attachments: axiomaticFunction.patch
>>
>>
>> We implemented the axiomatic retrieval function, which is a state- 
>> of-the-art retrieval function, to
>> replace the default similarity function in Lucene. We compared the  
>> performance of these two functions and reported the results at http://sifaka.cs.uiuc.edu/hfang/lucene/Lucene_exp.pdf 
>> .
>> The report shows that the performance of the axiomatic retrieval  
>> function is much better than the default function. The axiomatic  
>> retrieval function is able to find more relevant documents and  
>> users can see more relevant documents in the top-ranked documents.  
>> Incorporating such a state-of-the-art retrieval function could  
>> improve the search performance of all the applications which were  
>> built upon Lucene.
>> Most changes related to the implementation are made in  
>> AXSimilarity, TermScorer and TermQuery.java.  However, many test  
>> cases are hand coded to test whether the implementation of the  
>> default function is correct. Thus, I also made the modification to  
>> many test files to make the new retrieval function pass those  
>> cases. In fact, we found that some old test cases are not  
>> reasonable. For example, in the testQueries02 of TestBoolean2.java,
>> the query is "+w3 xx", and we have two documents "w1 xx w2 yy w3"  
>> and "w1 w3 xx w2 yy w3".
>> The second document should be more relevant than the first one,  
>> because it has more
>> occurrences of the query term "w3". But the original test case  
>> would require us to rank
>> the first document higher than the second one, which is not  
>> reasonable.
>
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--------------------------
Grant Ingersoll

Lucene Helpful Hints:
http://wiki.apache.org/lucene-java/BasicsOfPerformance
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