solr/core/src/test-files/solr/collection1/conf/schema-sweetspot.xml

<?xml version="1.0" ?>
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<!-- Test schema file for SweetSpotSimilarityFactory -->

<schema name="test" version="1.0">
  <fieldType name="string" class="solr.StrField" omitNorms="true" positionIncrementGap="0"/>

  <!-- default parameters -->
  <fieldType name="text" class="solr.TextField"
             indexed="true" stored="false">
    <analyzer class="org.apache.lucene.analysis.standard.StandardAnalyzer"/>
    <similarity class="solr.SweetSpotSimilarityFactory"/>
  </fieldType>

  <!-- using baseline TF -->
  <fieldType name="text_baseline" class="solr.TextField"
             indexed="true" stored="false">
    <analyzer class="org.apache.lucene.analysis.standard.StandardAnalyzer"/>
    <similarity class="solr.SweetSpotSimilarityFactory">
      <!-- TF -->
      <float name="baselineTfMin">6.0</float>
      <float name="baselineTfBase">1.5</float>
      <!-- plateau norm -->
      <int name="lengthNormMin">3</int>
      <int name="lengthNormMax">5</int>
      <float name="lengthNormSteepness">0.5</float>
    </similarity>
  </fieldType>

  <!-- using hyperbolic TF -->
  <fieldType name="text_hyperbolic" class="solr.TextField"
             indexed="true" stored="false">
    <analyzer class="org.apache.lucene.analysis.standard.StandardAnalyzer"/>
    <similarity class="solr.SweetSpotSimilarityFactory">
      <float name="hyperbolicTfMin">3.3</float>
      <float name="hyperbolicTfMax">7.7</float>
      <double name="hyperbolicTfBase">2.718281828459045</double> <!-- e -->
      <float name="hyperbolicTfOffset">5.0</float>
      <!-- plateau norm, shallower slope -->
      <int name="lengthNormMin">1</int>
      <int name="lengthNormMax">5</int>
      <float name="lengthNormSteepness">0.2</float>
    </similarity>
  </fieldType>

  <field name="id" type="string" indexed="true" stored="true" multiValued="false" required="false"/>
  <field name="text" type="text"/>
  <field name="text_baseline" type="text_baseline"/>
  <field name="text_hyperbolic" type="text_hyperbolic"/>

  <uniqueKey>id</uniqueKey>

</schema>