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<article class="content wrap" id="_content" data-uid="Lucene.Net.Search.Similarities.LMDirichletSimilarity">
<h1 id="Lucene_Net_Search_Similarities_LMDirichletSimilarity" data-uid="Lucene.Net.Search.Similarities.LMDirichletSimilarity" class="text-break">Class LMDirichletSimilarity
</h1>
<div class="markdown level0 summary"><p>Bayesian smoothing using Dirichlet priors. 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 &apos;01). ACM, New York, NY, USA, 334-342.
<p>
The formula as defined the paper assigns a negative score to documents that
contain the term, but with fewer occurrences than predicted by the collection
language model. The Lucene implementation returns <code>0</code> for such
documents.
</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">LMDirichletSimilarity</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_LMDirichletSimilarity_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public class LMDirichletSimilarity : 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_LMDirichletSimilarity__ctor.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.Similarities.LMDirichletSimilarity.%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 id="Lucene_Net_Search_Similarities_LMDirichletSimilarity__ctor_" data-uid="Lucene.Net.Search.Similarities.LMDirichletSimilarity.#ctor*"></a>
<h4 id="Lucene_Net_Search_Similarities_LMDirichletSimilarity__ctor" data-uid="Lucene.Net.Search.Similarities.LMDirichletSimilarity.#ctor">LMDirichletSimilarity()</h4>
<div class="markdown level1 summary"><p>Instantiates the similarity with the default μ value of 2000. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public LMDirichletSimilarity()</code></pre>
</div>
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<a id="Lucene_Net_Search_Similarities_LMDirichletSimilarity__ctor_" data-uid="Lucene.Net.Search.Similarities.LMDirichletSimilarity.#ctor*"></a>
<h4 id="Lucene_Net_Search_Similarities_LMDirichletSimilarity__ctor_Lucene_Net_Search_Similarities_LMSimilarity_ICollectionModel_" data-uid="Lucene.Net.Search.Similarities.LMDirichletSimilarity.#ctor(Lucene.Net.Search.Similarities.LMSimilarity.ICollectionModel)">LMDirichletSimilarity(LMSimilarity.ICollectionModel)</h4>
<div class="markdown level1 summary"><p>Instantiates the similarity with the default μ value of 2000. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public LMDirichletSimilarity(LMSimilarity.ICollectionModel collectionModel)</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>
</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_LMDirichletSimilarity__ctor_Lucene_Net_Search_Similarities_LMSimilarity_ICollectionModel_System_Single_.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.Similarities.LMDirichletSimilarity.%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>
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</span>
<a id="Lucene_Net_Search_Similarities_LMDirichletSimilarity__ctor_" data-uid="Lucene.Net.Search.Similarities.LMDirichletSimilarity.#ctor*"></a>
<h4 id="Lucene_Net_Search_Similarities_LMDirichletSimilarity__ctor_Lucene_Net_Search_Similarities_LMSimilarity_ICollectionModel_System_Single_" data-uid="Lucene.Net.Search.Similarities.LMDirichletSimilarity.#ctor(Lucene.Net.Search.Similarities.LMSimilarity.ICollectionModel,System.Single)">LMDirichletSimilarity(LMSimilarity.ICollectionModel, Single)</h4>
<div class="markdown level1 summary"><p>Instantiates the similarity with the provided μ parameter. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public LMDirichletSimilarity(LMSimilarity.ICollectionModel collectionModel, float mu)</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">mu</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_LMDirichletSimilarity__ctor_System_Single_.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.Similarities.LMDirichletSimilarity.%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>
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</span>
<a id="Lucene_Net_Search_Similarities_LMDirichletSimilarity__ctor_" data-uid="Lucene.Net.Search.Similarities.LMDirichletSimilarity.#ctor*"></a>
<h4 id="Lucene_Net_Search_Similarities_LMDirichletSimilarity__ctor_System_Single_" data-uid="Lucene.Net.Search.Similarities.LMDirichletSimilarity.#ctor(System.Single)">LMDirichletSimilarity(Single)</h4>
<div class="markdown level1 summary"><p>Instantiates the similarity with the provided μ parameter. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public LMDirichletSimilarity(float mu)</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">mu</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_LMDirichletSimilarity_Mu.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.Similarities.LMDirichletSimilarity.Mu%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 id="Lucene_Net_Search_Similarities_LMDirichletSimilarity_Mu_" data-uid="Lucene.Net.Search.Similarities.LMDirichletSimilarity.Mu*"></a>
<h4 id="Lucene_Net_Search_Similarities_LMDirichletSimilarity_Mu" data-uid="Lucene.Net.Search.Similarities.LMDirichletSimilarity.Mu">Mu</h4>
<div class="markdown level1 summary"><p>Returns the μ 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 Mu { 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>
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<a id="Lucene_Net_Search_Similarities_LMDirichletSimilarity_Explain_" data-uid="Lucene.Net.Search.Similarities.LMDirichletSimilarity.Explain*"></a>
<h4 id="Lucene_Net_Search_Similarities_LMDirichletSimilarity_Explain_Lucene_Net_Search_Explanation_Lucene_Net_Search_Similarities_BasicStats_System_Int32_System_Single_System_Single_" data-uid="Lucene.Net.Search.Similarities.LMDirichletSimilarity.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>
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<a id="Lucene_Net_Search_Similarities_LMDirichletSimilarity_GetName_" data-uid="Lucene.Net.Search.Similarities.LMDirichletSimilarity.GetName*"></a>
<h4 id="Lucene_Net_Search_Similarities_LMDirichletSimilarity_GetName" data-uid="Lucene.Net.Search.Similarities.LMDirichletSimilarity.GetName">GetName()</h4>
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<h5 class="decalaration">Declaration</h5>
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<pre><code class="lang-csharp hljs">public override string GetName()</code></pre>
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<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_LMDirichletSimilarity_Score_" data-uid="Lucene.Net.Search.Similarities.LMDirichletSimilarity.Score*"></a>
<h4 id="Lucene_Net_Search_Similarities_LMDirichletSimilarity_Score_Lucene_Net_Search_Similarities_BasicStats_System_Single_System_Single_" data-uid="Lucene.Net.Search.Similarities.LMDirichletSimilarity.Score(Lucene.Net.Search.Similarities.BasicStats,System.Single,System.Single)">Score(BasicStats, Single, Single)</h4>
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<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>
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