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| <h1 id="Lucene_Net_Search_PostingsHighlight_PassageScorer" data-uid="Lucene.Net.Search.PostingsHighlight.PassageScorer" class="text-break">Class PassageScorer |
| </h1> |
| <div class="markdown level0 summary"><p>Ranks passages found by <a class="xref" href="Lucene.Net.Search.PostingsHighlight.ICUPostingsHighlighter.html">ICUPostingsHighlighter</a>. |
| <p> |
| Each passage is scored as a miniature document within the document. |
| The final score is computed as <code>norm</code> * ∑ (<code>weight</code> * <code>tf</code>). |
| The default implementation is <code>norm</code> * BM25.</p> |
| <div class="lucene-block lucene-experimental">This is a Lucene.NET EXPERIMENTAL API, use at your own risk</div></div> |
| <div class="markdown level0 conceptual"></div> |
| <div class="inheritance"> |
| <h5>Inheritance</h5> |
| <div class="level0"><span class="xref">System.Object</span></div> |
| <div class="level1"><span class="xref">PassageScorer</span></div> |
| </div> |
| <div class="inheritedMembers"> |
| <h5>Inherited Members</h5> |
| <div> |
| <span class="xref">System.Object.Equals(System.Object)</span> |
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| </div> |
| <h6><strong>Namespace</strong>: <a class="xref" href="Lucene.Net.Search.PostingsHighlight.html">Lucene.Net.Search.PostingsHighlight</a></h6> |
| <h6><strong>Assembly</strong>: Lucene.Net.ICU.dll</h6> |
| <h5 id="Lucene_Net_Search_PostingsHighlight_PassageScorer_syntax">Syntax</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public class PassageScorer</code></pre> |
| </div> |
| <h3 id="constructors">Constructors |
| </h3> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00013/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_PostingsHighlight_PassageScorer__ctor.md&value=---%0Auid%3A%20Lucene.Net.Search.PostingsHighlight.PassageScorer.%23ctor%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a> |
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| <a href="https://github.com/NightOwl888/lucenenet/blob/fix/apidocs-layout/src/Lucene.Net.Highlighter/PostingsHighlight/PassageScorer.cs/#L51">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_PostingsHighlight_PassageScorer__ctor_" data-uid="Lucene.Net.Search.PostingsHighlight.PassageScorer.#ctor*"></a> |
| <h4 id="Lucene_Net_Search_PostingsHighlight_PassageScorer__ctor" data-uid="Lucene.Net.Search.PostingsHighlight.PassageScorer.#ctor">PassageScorer()</h4> |
| <div class="markdown level1 summary"><p>Creates <a class="xref" href="Lucene.Net.Search.PostingsHighlight.PassageScorer.html">PassageScorer</a> with these default values: |
| <ul><li><code>k1 = 1.2</code></li><li><code>b = 0.75</code></li><li><code>pivot = 87</code></li></ul></p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public PassageScorer()</code></pre> |
| </div> |
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| <a href="https://github.com/NightOwl888/lucenenet/blob/fix/apidocs-layout/src/Lucene.Net.Highlighter/PostingsHighlight/PassageScorer.cs/#L64">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_PostingsHighlight_PassageScorer__ctor_" data-uid="Lucene.Net.Search.PostingsHighlight.PassageScorer.#ctor*"></a> |
| <h4 id="Lucene_Net_Search_PostingsHighlight_PassageScorer__ctor_System_Single_System_Single_System_Single_" data-uid="Lucene.Net.Search.PostingsHighlight.PassageScorer.#ctor(System.Single,System.Single,System.Single)">PassageScorer(Single, Single, Single)</h4> |
| <div class="markdown level1 summary"><p>Creates <a class="xref" href="Lucene.Net.Search.PostingsHighlight.PassageScorer.html">PassageScorer</a> with specified scoring parameters</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public PassageScorer(float k1, float b, float pivot)</code></pre> |
| </div> |
| <h5 class="parameters">Parameters</h5> |
| <table class="table table-bordered table-striped table-condensed"> |
| <thead> |
| <tr> |
| <th>Type</th> |
| <th>Name</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><span class="xref">System.Single</span></td> |
| <td><span class="parametername">k1</span></td> |
| <td><p>Controls non-linear term frequency normalization (saturation).</p> |
| </td> |
| </tr> |
| <tr> |
| <td><span class="xref">System.Single</span></td> |
| <td><span class="parametername">b</span></td> |
| <td><p>Controls to what degree passage length normalizes tf values.</p> |
| </td> |
| </tr> |
| <tr> |
| <td><span class="xref">System.Single</span></td> |
| <td><span class="parametername">pivot</span></td> |
| <td><p>Pivot value for length normalization (some rough idea of average sentence length in characters).</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <h3 id="methods">Methods |
| </h3> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00013/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_PostingsHighlight_PassageScorer_Norm_System_Int32_.md&value=---%0Auid%3A%20Lucene.Net.Search.PostingsHighlight.PassageScorer.Norm(System.Int32)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a> |
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| <a href="https://github.com/NightOwl888/lucenenet/blob/fix/apidocs-layout/src/Lucene.Net.Highlighter/PostingsHighlight/PassageScorer.cs/#L108">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_PostingsHighlight_PassageScorer_Norm_" data-uid="Lucene.Net.Search.PostingsHighlight.PassageScorer.Norm*"></a> |
| <h4 id="Lucene_Net_Search_PostingsHighlight_PassageScorer_Norm_System_Int32_" data-uid="Lucene.Net.Search.PostingsHighlight.PassageScorer.Norm(System.Int32)">Norm(Int32)</h4> |
| <div class="markdown level1 summary"><p>Normalize a passage according to its position in the document. |
| <p> |
| Typically passages towards the beginning of the document are |
| more useful for summarizing the contents. |
| <p> |
| The default implementation is <code>1 + 1/log(pivot + passageStart)</code></p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public virtual float Norm(int passageStart)</code></pre> |
| </div> |
| <h5 class="parameters">Parameters</h5> |
| <table class="table table-bordered table-striped table-condensed"> |
| <thead> |
| <tr> |
| <th>Type</th> |
| <th>Name</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><span class="xref">System.Int32</span></td> |
| <td><span class="parametername">passageStart</span></td> |
| <td><p>start offset of the passage</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <h5 class="returns">Returns</h5> |
| <table class="table table-bordered table-striped table-condensed"> |
| <thead> |
| <tr> |
| <th>Type</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><span class="xref">System.Single</span></td> |
| <td><p>a boost value multiplied into the passage's core.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00013/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_PostingsHighlight_PassageScorer_Tf_System_Int32_System_Int32_.md&value=---%0Auid%3A%20Lucene.Net.Search.PostingsHighlight.PassageScorer.Tf(System.Int32%2CSystem.Int32)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a> |
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| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/NightOwl888/lucenenet/blob/fix/apidocs-layout/src/Lucene.Net.Highlighter/PostingsHighlight/PassageScorer.cs/#L92">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_PostingsHighlight_PassageScorer_Tf_" data-uid="Lucene.Net.Search.PostingsHighlight.PassageScorer.Tf*"></a> |
| <h4 id="Lucene_Net_Search_PostingsHighlight_PassageScorer_Tf_System_Int32_System_Int32_" data-uid="Lucene.Net.Search.PostingsHighlight.PassageScorer.Tf(System.Int32,System.Int32)">Tf(Int32, Int32)</h4> |
| <div class="markdown level1 summary"><p>Computes term weight, given the frequency within the passage |
| and the passage's length.</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public virtual float Tf(int freq, int passageLen)</code></pre> |
| </div> |
| <h5 class="parameters">Parameters</h5> |
| <table class="table table-bordered table-striped table-condensed"> |
| <thead> |
| <tr> |
| <th>Type</th> |
| <th>Name</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><span class="xref">System.Int32</span></td> |
| <td><span class="parametername">freq</span></td> |
| <td><p>number of occurrences of within this passage</p> |
| </td> |
| </tr> |
| <tr> |
| <td><span class="xref">System.Int32</span></td> |
| <td><span class="parametername">passageLen</span></td> |
| <td><p>length of the passage in characters.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <h5 class="returns">Returns</h5> |
| <table class="table table-bordered table-striped table-condensed"> |
| <thead> |
| <tr> |
| <th>Type</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><span class="xref">System.Single</span></td> |
| <td><p>term weight</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00013/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_PostingsHighlight_PassageScorer_Weight_System_Int32_System_Int32_.md&value=---%0Auid%3A%20Lucene.Net.Search.PostingsHighlight.PassageScorer.Weight(System.Int32%2CSystem.Int32)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a> |
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| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/NightOwl888/lucenenet/blob/fix/apidocs-layout/src/Lucene.Net.Highlighter/PostingsHighlight/PassageScorer.cs/#L77">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_PostingsHighlight_PassageScorer_Weight_" data-uid="Lucene.Net.Search.PostingsHighlight.PassageScorer.Weight*"></a> |
| <h4 id="Lucene_Net_Search_PostingsHighlight_PassageScorer_Weight_System_Int32_System_Int32_" data-uid="Lucene.Net.Search.PostingsHighlight.PassageScorer.Weight(System.Int32,System.Int32)">Weight(Int32, Int32)</h4> |
| <div class="markdown level1 summary"><p>Computes term importance, given its in-document statistics.</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public virtual float Weight(int contentLength, int totalTermFreq)</code></pre> |
| </div> |
| <h5 class="parameters">Parameters</h5> |
| <table class="table table-bordered table-striped table-condensed"> |
| <thead> |
| <tr> |
| <th>Type</th> |
| <th>Name</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><span class="xref">System.Int32</span></td> |
| <td><span class="parametername">contentLength</span></td> |
| <td><p>length of document in characters</p> |
| </td> |
| </tr> |
| <tr> |
| <td><span class="xref">System.Int32</span></td> |
| <td><span class="parametername">totalTermFreq</span></td> |
| <td><p>number of time term occurs in document</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <h5 class="returns">Returns</h5> |
| <table class="table table-bordered table-striped table-condensed"> |
| <thead> |
| <tr> |
| <th>Type</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><span class="xref">System.Single</span></td> |
| <td><p>term importance</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </article> |
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