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https://issues.apache.org/jira/browse/SOLR-1365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12999577#comment-12999577
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Kevin Osborn commented on SOLR-1365:
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I had almost forgotten about this issue. I should be able to wrap this up soon.
> Add configurable Sweetspot Similarity factory
> ---------------------------------------------
>
> Key: SOLR-1365
> URL: https://issues.apache.org/jira/browse/SOLR-1365
> Project: Solr
> Issue Type: New Feature
> Affects Versions: 1.3
> Reporter: Kevin Osborn
> Priority: Minor
> Fix For: Next
>
> Attachments: SOLR-1365.patch
>
>
> This is some code that I wrote a while back.
> Normally, if you use SweetSpotSimilarity, you are going to make it do
> something useful by extending SweetSpotSimilarity. So, instead, I made a
> factory class and an configurable SweetSpotSimilarty. There are two classes.
> SweetSpotSimilarityFactory reads the parameters from schema.xml. It then
> creates an instance of VariableSweetSpotSimilarity, which is my custom
> SweetSpotSimilarity class. In addition to the standard functions, it also
> handles dynamic fields.
> So, in schema.xml, you could have something like this:
> <similarity class="org.apache.solr.schema.SweetSpotSimilarityFactory">
> <bool name="useHyperbolicTf">true</bool>
> <float name="hyperbolicTfFactorsMin">1.0</float>
> <float name="hyperbolicTfFactorsMax">1.5</float>
> <float name="hyperbolicTfFactorsBase">1.3</float>
> <float name="hyperbolicTfFactorsXOffset">2.0</float>
> <int name="lengthNormFactorsMin">1</int>
> <int name="lengthNormFactorsMax">1</int>
> <float name="lengthNormFactorsSteepness">0.5</float>
> <int name="lengthNormFactorsMin_description">2</int>
> <int name="lengthNormFactorsMax_description">9</int>
> <float name="lengthNormFactorsSteepness_description">0.2</float>
> <int name="lengthNormFactorsMin_supplierDescription_*">2</int>
> <int name="lengthNormFactorsMax_supplierDescription_*">7</int>
> <float
> name="lengthNormFactorsSteepness_supplierDescription_*">0.4</float>
> </similarity>
> So, now everything is in a config file instead of having to create your own
> subclass.
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