: sloppyFreq(distance). hyperbolicTf() only comes into play if you : override the tf method in your own subclass to call it instead of the : baselineTf which it normally calls. I also didn't get what it was : trying to do.
Correct, as documented... http://lucene.apache.org/core/old_versioned_docs/versions/3_5_0/api/contrib-misc/org/apache/lucene/misc/SweetSpotSimilarity.html "For tf, baselineTf and hyperbolicTf functions are provided, which subclasses can choose between." tf() ... "Delegates to baselineTf" hyperbolicTf ... "This code is provided as a convenience for subclasses that want to use a hyperbolic tf function." As for what hyperbolicTf is trying to do ... it creates a hyperbolic function letting you specify a hard max no matter how many terms there are. : > And I am aware that SweetSpotSimilarity resulted from this paper : > : > http://trec.nist.gov/pubs/trec16/papers/ibm-haifa.mq.final.pdf For the record, that paper did not result in SSS -- I wrote SSS ~Dec 2005 and contributed it to Apache a few months later on behalf of CNET Networks where i developed it to solve some specific problems we had with product data... https://issues.apache.org/jira/browse/LUCENE-577 http://mail-archives.apache.org/mod_mbox/lucene-dev/200605.mbox/%3CF9F270C4-FA1E-460F-A54F-E2E56AAD0286%40rectangular.com%3E (and subsequent replies) ...Doron wrote the paper later, although you'll note lots of dicsussions arround that time on the mailing list about customizing Similarity based on domain specific data -- the concepts certainly weren't novel. : > However, I was wondering if there was a resource that explained (and gave examples) of how SSS : > works and what each parameter (hyperbolic, etc) means. I know this is a Lucene list but I am actually The functions are pretty clearly spelled out in the javadocs -- you just set the options on the class to control the constant values of the functions. The easiest way to understand them is probably to use something like gnuplot to graph them using various values for the constants, and then compare to graphs of the corrisponding functions from DefaultSimilarity. -Hoss --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
