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From Emmanuel Espina <>
Subject Re: Getting a similarity score for an arbitrary pair of documents or a query and a document
Date Wed, 06 Mar 2013 14:55:32 GMT
Have you already checked Solr's more like this? and Your describe a problem similar to
the use case of that component and if there is something to hack is solr's
more like this.

Lucene's similarity is a low level class used by some queries (for example
TermQueries) but I don't think that you need something so low level from
what you describe.


2013/3/6 Michael O'Leary <>

> Is there an api in Lucene for finding the similarity score for two
> documents that have been randomly pulled from an index? What about for a
> query and a randomly selected document?
> I realize this isn't the standard purpose of Lucene, but I was given a task
> to compare similarity scores for the Similarity classes defined in Lucene
> 4.x using a somewhat large predefined set of documents and query strings,
> and I am finding that collecting the results by indexing the documents in
> separate indexes with each of the Similarity classes, searching using the
> query strings, locating the subset of documents in the results that I am
> interested in and recording the scores is taking quite a long time.
> I am about to look through the Lucene source code to see how the Similarity
> classes are used in normal use cases such as search and more-like-this, but
> if someone could direct me on where to look, or, even better, knows of an
> api function that takes a pair of documents, or a query and a document, and
> returns a similarity score for them, I would greatly appreciate it.
> Thanks,
> Mike

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