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From jian chen <>
Subject Re: MySimilarity with Lucene 1.2 ?
Date Fri, 19 Aug 2005 03:26:18 GMT

I hacked the lucene 1.2 a little while ago and I am trying to use my
own similarity algorithm. If you are interested in the changes I have
made to the Lucene 1.2, you can email me back at chenjian1227 at



On 8/18/05, Karl Koch <> wrote:
> Hello Lucene experts,
> as you might have seen in my previous postings, I am bound to use not more
> than Lucene 1.2 (due to hardware limitations I can only use Java 1.1 or
> 1.2).
> I would like to do my own Similarity implementation which, I think, would
> allow me to insert other algorithms in Lucene which would enable me to
> compare different IR algoritms with Lucene as a framework. I got advice from
> here to use DefaultSimiliarity. However, this class was, accoding to the
> JavaDoc and the CHANGE text file, only introduced in Lucene 1.3. In Lucene
> 1.2 it seems to be all hard and solid coded without the intension to have
> flexiblility at this point.
> Now some questions:
> 1) Am I wrong here and does somebody know a strategy which could allow me to
> have an enhancement that could allow me to add my own IR similarity
> algoritm?
> 2) Does somebody know how to hack the Lucene code in order to make it
> happen? I presume some code changes could do that: Either changes in the
> Similarity class directly or a change of Similarity to non-final (plus
> setters to set new similarities like in Lucene 1.3).
> Any other suggestions? I generally like the small-ness of Lucene 1.2 but it
> is just that I would like to have a little bit more flexiblity at one
> point...
> Karl
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