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| <article class="content wrap" id="_content" data-uid="Lucene.Net.Search.Similarities.LMJelinekMercerSimilarity"> |
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| |
| <h1 id="Lucene_Net_Search_Similarities_LMJelinekMercerSimilarity" data-uid="Lucene.Net.Search.Similarities.LMJelinekMercerSimilarity" class="text-break">Class LMJelinekMercerSimilarity |
| </h1> |
| <div class="markdown level0 summary"><p>Language model based on the Jelinek-Mercer smoothing method. From Chengxiang |
| Zhai and John Lafferty. 2001. A study of smoothing methods for language |
| models applied to Ad Hoc information retrieval. In Proceedings of the 24th |
| annual international ACM SIGIR conference on Research and development in |
| information retrieval (SIGIR '01). ACM, New York, NY, USA, 334-342. |
| <p>The model has a single parameter, λ. According to said paper, the |
| optimal value depends on both the collection and the query. The optimal value |
| is around <code>0.1</code> for title queries and <code>0.7</code> for long queries.</p></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"><a class="xref" href="Lucene.Net.Search.Similarities.Similarity.html">Similarity</a></div> |
| <div class="level2"><a class="xref" href="Lucene.Net.Search.Similarities.SimilarityBase.html">SimilarityBase</a></div> |
| <div class="level3"><a class="xref" href="Lucene.Net.Search.Similarities.LMSimilarity.html">LMSimilarity</a></div> |
| <div class="level4"><span class="xref">LMJelinekMercerSimilarity</span></div> |
| </div> |
| <div class="inheritedMembers"> |
| <h5>Inherited Members</h5> |
| <div> |
| <a class="xref" href="Lucene.Net.Search.Similarities.LMSimilarity.html#Lucene_Net_Search_Similarities_LMSimilarity_m_collectionModel">LMSimilarity.m_collectionModel</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Search.Similarities.LMSimilarity.html#Lucene_Net_Search_Similarities_LMSimilarity_NewStats_System_String_System_Single_">LMSimilarity.NewStats(String, Single)</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Search.Similarities.LMSimilarity.html#Lucene_Net_Search_Similarities_LMSimilarity_FillBasicStats_Lucene_Net_Search_Similarities_BasicStats_Lucene_Net_Search_CollectionStatistics_Lucene_Net_Search_TermStatistics_">LMSimilarity.FillBasicStats(BasicStats, CollectionStatistics, TermStatistics)</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Search.Similarities.LMSimilarity.html#Lucene_Net_Search_Similarities_LMSimilarity_ToString">LMSimilarity.ToString()</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Search.Similarities.SimilarityBase.html#Lucene_Net_Search_Similarities_SimilarityBase_DiscountOverlaps">SimilarityBase.DiscountOverlaps</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Search.Similarities.SimilarityBase.html#Lucene_Net_Search_Similarities_SimilarityBase_ComputeWeight_System_Single_Lucene_Net_Search_CollectionStatistics_Lucene_Net_Search_TermStatistics___">SimilarityBase.ComputeWeight(Single, CollectionStatistics, TermStatistics[])</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Search.Similarities.SimilarityBase.html#Lucene_Net_Search_Similarities_SimilarityBase_Explain_Lucene_Net_Search_Similarities_BasicStats_System_Int32_Lucene_Net_Search_Explanation_System_Single_">SimilarityBase.Explain(BasicStats, Int32, Explanation, Single)</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Search.Similarities.SimilarityBase.html#Lucene_Net_Search_Similarities_SimilarityBase_GetSimScorer_Lucene_Net_Search_Similarities_Similarity_SimWeight_Lucene_Net_Index_AtomicReaderContext_">SimilarityBase.GetSimScorer(Similarity.SimWeight, AtomicReaderContext)</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Search.Similarities.SimilarityBase.html#Lucene_Net_Search_Similarities_SimilarityBase_ComputeNorm_Lucene_Net_Index_FieldInvertState_">SimilarityBase.ComputeNorm(FieldInvertState)</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Search.Similarities.SimilarityBase.html#Lucene_Net_Search_Similarities_SimilarityBase_DecodeNormValue_System_Byte_">SimilarityBase.DecodeNormValue(Byte)</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Search.Similarities.SimilarityBase.html#Lucene_Net_Search_Similarities_SimilarityBase_EncodeNormValue_System_Single_System_Single_">SimilarityBase.EncodeNormValue(Single, Single)</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Search.Similarities.SimilarityBase.html#Lucene_Net_Search_Similarities_SimilarityBase_Log2_System_Double_">SimilarityBase.Log2(Double)</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Search.Similarities.Similarity.html#Lucene_Net_Search_Similarities_Similarity_Coord_System_Int32_System_Int32_">Similarity.Coord(Int32, Int32)</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Search.Similarities.Similarity.html#Lucene_Net_Search_Similarities_Similarity_QueryNorm_System_Single_">Similarity.QueryNorm(Single)</a> |
| </div> |
| <div> |
| <span class="xref">System.Object.Equals(System.Object)</span> |
| </div> |
| <div> |
| <span class="xref">System.Object.Equals(System.Object, System.Object)</span> |
| </div> |
| <div> |
| <span class="xref">System.Object.GetHashCode()</span> |
| </div> |
| <div> |
| <span class="xref">System.Object.GetType()</span> |
| </div> |
| <div> |
| <span class="xref">System.Object.MemberwiseClone()</span> |
| </div> |
| <div> |
| <span class="xref">System.Object.ReferenceEquals(System.Object, System.Object)</span> |
| </div> |
| </div> |
| <h6><strong>Namespace</strong>: <a class="xref" href="Lucene.Net.Search.Similarities.html">Lucene.Net.Search.Similarities</a></h6> |
| <h6><strong>Assembly</strong>: Lucene.Net.dll</h6> |
| <h5 id="Lucene_Net_Search_Similarities_LMJelinekMercerSimilarity_syntax">Syntax</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public class LMJelinekMercerSimilarity : LMSimilarity</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_Similarities_LMJelinekMercerSimilarity__ctor_Lucene_Net_Search_Similarities_LMSimilarity_ICollectionModel_System_Single_.md&value=---%0Auid%3A%20Lucene.Net.Search.Similarities.LMJelinekMercerSimilarity.%23ctor(Lucene.Net.Search.Similarities.LMSimilarity.ICollectionModel%2CSystem.Single)%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> |
| </span> |
| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/NightOwl888/lucenenet/blob/fix/apidocs-layout/src/Lucene.Net/Search/Similarities/LMJelinekMercerSimilarity.cs/#L44">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Similarities_LMJelinekMercerSimilarity__ctor_" data-uid="Lucene.Net.Search.Similarities.LMJelinekMercerSimilarity.#ctor*"></a> |
| <h4 id="Lucene_Net_Search_Similarities_LMJelinekMercerSimilarity__ctor_Lucene_Net_Search_Similarities_LMSimilarity_ICollectionModel_System_Single_" data-uid="Lucene.Net.Search.Similarities.LMJelinekMercerSimilarity.#ctor(Lucene.Net.Search.Similarities.LMSimilarity.ICollectionModel,System.Single)">LMJelinekMercerSimilarity(LMSimilarity.ICollectionModel, Single)</h4> |
| <div class="markdown level1 summary"><p>Instantiates with the specified <code data-dev-comment-type="paramref" class="paramref">collectionModel</code> and λ parameter. </p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public LMJelinekMercerSimilarity(LMSimilarity.ICollectionModel collectionModel, float lambda)</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><a class="xref" href="Lucene.Net.Search.Similarities.LMSimilarity.ICollectionModel.html">LMSimilarity.ICollectionModel</a></td> |
| <td><span class="parametername">collectionModel</span></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><span class="xref">System.Single</span></td> |
| <td><span class="parametername">lambda</span></td> |
| <td></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_Similarities_LMJelinekMercerSimilarity__ctor_System_Single_.md&value=---%0Auid%3A%20Lucene.Net.Search.Similarities.LMJelinekMercerSimilarity.%23ctor(System.Single)%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> |
| </span> |
| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/NightOwl888/lucenenet/blob/fix/apidocs-layout/src/Lucene.Net/Search/Similarities/LMJelinekMercerSimilarity.cs/#L52">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Similarities_LMJelinekMercerSimilarity__ctor_" data-uid="Lucene.Net.Search.Similarities.LMJelinekMercerSimilarity.#ctor*"></a> |
| <h4 id="Lucene_Net_Search_Similarities_LMJelinekMercerSimilarity__ctor_System_Single_" data-uid="Lucene.Net.Search.Similarities.LMJelinekMercerSimilarity.#ctor(System.Single)">LMJelinekMercerSimilarity(Single)</h4> |
| <div class="markdown level1 summary"><p>Instantiates with the specified λ parameter. </p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public LMJelinekMercerSimilarity(float lambda)</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">lambda</span></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <h3 id="properties">Properties |
| </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_Similarities_LMJelinekMercerSimilarity_Lambda.md&value=---%0Auid%3A%20Lucene.Net.Search.Similarities.LMJelinekMercerSimilarity.Lambda%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> |
| </span> |
| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/NightOwl888/lucenenet/blob/fix/apidocs-layout/src/Lucene.Net/Search/Similarities/LMJelinekMercerSimilarity.cs/#L74">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Similarities_LMJelinekMercerSimilarity_Lambda_" data-uid="Lucene.Net.Search.Similarities.LMJelinekMercerSimilarity.Lambda*"></a> |
| <h4 id="Lucene_Net_Search_Similarities_LMJelinekMercerSimilarity_Lambda" data-uid="Lucene.Net.Search.Similarities.LMJelinekMercerSimilarity.Lambda">Lambda</h4> |
| <div class="markdown level1 summary"><p>Returns the λ parameter. </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 Lambda { get; }</code></pre> |
| </div> |
| <h5 class="propertyValue">Property Value</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></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_Similarities_LMJelinekMercerSimilarity_Explain_Lucene_Net_Search_Explanation_Lucene_Net_Search_Similarities_BasicStats_System_Int32_System_Single_System_Single_.md&value=---%0Auid%3A%20Lucene.Net.Search.Similarities.LMJelinekMercerSimilarity.Explain(Lucene.Net.Search.Explanation%2CLucene.Net.Search.Similarities.BasicStats%2CSystem.Int32%2CSystem.Single%2CSystem.Single)%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> |
| </span> |
| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/NightOwl888/lucenenet/blob/fix/apidocs-layout/src/Lucene.Net/Search/Similarities/LMJelinekMercerSimilarity.cs/#L62">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Similarities_LMJelinekMercerSimilarity_Explain_" data-uid="Lucene.Net.Search.Similarities.LMJelinekMercerSimilarity.Explain*"></a> |
| <h4 id="Lucene_Net_Search_Similarities_LMJelinekMercerSimilarity_Explain_Lucene_Net_Search_Explanation_Lucene_Net_Search_Similarities_BasicStats_System_Int32_System_Single_System_Single_" data-uid="Lucene.Net.Search.Similarities.LMJelinekMercerSimilarity.Explain(Lucene.Net.Search.Explanation,Lucene.Net.Search.Similarities.BasicStats,System.Int32,System.Single,System.Single)">Explain(Explanation, BasicStats, Int32, Single, Single)</h4> |
| <div class="markdown level1 summary"></div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">protected override void Explain(Explanation expl, BasicStats stats, int doc, float freq, float docLen)</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><a class="xref" href="Lucene.Net.Search.Explanation.html">Explanation</a></td> |
| <td><span class="parametername">expl</span></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><a class="xref" href="Lucene.Net.Search.Similarities.BasicStats.html">BasicStats</a></td> |
| <td><span class="parametername">stats</span></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><span class="xref">System.Int32</span></td> |
| <td><span class="parametername">doc</span></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><span class="xref">System.Single</span></td> |
| <td><span class="parametername">freq</span></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><span class="xref">System.Single</span></td> |
| <td><span class="parametername">docLen</span></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <h5 class="overrides">Overrides</h5> |
| <div><a class="xref" href="Lucene.Net.Search.Similarities.LMSimilarity.html#Lucene_Net_Search_Similarities_LMSimilarity_Explain_Lucene_Net_Search_Explanation_Lucene_Net_Search_Similarities_BasicStats_System_Int32_System_Single_System_Single_">LMSimilarity.Explain(Explanation, BasicStats, Int32, Single, Single)</a></div> |
| <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_Similarities_LMJelinekMercerSimilarity_GetName.md&value=---%0Auid%3A%20Lucene.Net.Search.Similarities.LMJelinekMercerSimilarity.GetName%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> |
| </span> |
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| <a href="https://github.com/NightOwl888/lucenenet/blob/fix/apidocs-layout/src/Lucene.Net/Search/Similarities/LMJelinekMercerSimilarity.cs/#L76">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Similarities_LMJelinekMercerSimilarity_GetName_" data-uid="Lucene.Net.Search.Similarities.LMJelinekMercerSimilarity.GetName*"></a> |
| <h4 id="Lucene_Net_Search_Similarities_LMJelinekMercerSimilarity_GetName" data-uid="Lucene.Net.Search.Similarities.LMJelinekMercerSimilarity.GetName">GetName()</h4> |
| <div class="markdown level1 summary"></div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public override string GetName()</code></pre> |
| </div> |
| <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.String</span></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <h5 class="overrides">Overrides</h5> |
| <div><a class="xref" href="Lucene.Net.Search.Similarities.LMSimilarity.html#Lucene_Net_Search_Similarities_LMSimilarity_GetName">LMSimilarity.GetName()</a></div> |
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| <a id="Lucene_Net_Search_Similarities_LMJelinekMercerSimilarity_Score_" data-uid="Lucene.Net.Search.Similarities.LMJelinekMercerSimilarity.Score*"></a> |
| <h4 id="Lucene_Net_Search_Similarities_LMJelinekMercerSimilarity_Score_Lucene_Net_Search_Similarities_BasicStats_System_Single_System_Single_" data-uid="Lucene.Net.Search.Similarities.LMJelinekMercerSimilarity.Score(Lucene.Net.Search.Similarities.BasicStats,System.Single,System.Single)">Score(BasicStats, Single, Single)</h4> |
| <div class="markdown level1 summary"></div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public override float Score(BasicStats stats, float freq, float docLen)</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><a class="xref" href="Lucene.Net.Search.Similarities.BasicStats.html">BasicStats</a></td> |
| <td><span class="parametername">stats</span></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><span class="xref">System.Single</span></td> |
| <td><span class="parametername">freq</span></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><span class="xref">System.Single</span></td> |
| <td><span class="parametername">docLen</span></td> |
| <td></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></td> |
| </tr> |
| </tbody> |
| </table> |
| <h5 class="overrides">Overrides</h5> |
| <div><a class="xref" href="Lucene.Net.Search.Similarities.SimilarityBase.html#Lucene_Net_Search_Similarities_SimilarityBase_Score_Lucene_Net_Search_Similarities_BasicStats_System_Single_System_Single_">SimilarityBase.Score(BasicStats, Single, Single)</a></div> |
| </article> |
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