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From "Michael Busch (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-965) Implement a state-of-the-art retrieval function in Lucene
Date Tue, 06 Oct 2009 05:49:31 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-965?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Busch updated LUCENE-965:
---------------------------------

    Fix Version/s:     (was: 3.0)
                   3.1

> 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: 3.1
>
>         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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