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From "Michael O'Leary" <>
Subject Setting Similarity classes in Benchmark .alg scripts
Date Mon, 04 Feb 2013 23:01:24 GMT
I'd like to compare the relevance scores that are returned when using the
Similarity classes that are available in Lucene 4.x, and it seems like
using the Benchmark component would be a good way to do that. It looks like
the isn't currently a way to specify a Similarity class to use in the
config settings used in .alg files. I can see how the analyzer that is
specified in an .alg file is created in, and then used
in and ReadTokenTask. It seems like the Similarity
classes could be supported in a similar way. Are there other considerations
that also need to be taken account of? NewAnalyzerTask apparently only uses
Analyzers' default constructors (with a Version arg or with no args), and
some of the Similarity classes don't have default constructors, so it would
also be necessary to define ways to specify the arguments that the
Similarity class constructors take. Are there any classes that are
instantiated in the Benchmark component using non-default constructors that
I could look at as examples? On a scale of 1 to 10, how hard it is to add
features of this kind to the Benchmark component?

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