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| <h1 id="Lucene_Net_Search_Similarities_DefaultSimilarity" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity" class="text-break">Class DefaultSimilarity |
| </h1> |
| <div class="markdown level0 summary"><p>Expert: Default scoring implementation which encodes (<a class="xref" href="Lucene.Net.Search.Similarities.DefaultSimilarity.html#Lucene_Net_Search_Similarities_DefaultSimilarity_EncodeNormValue_System_Single_">EncodeNormValue(Single)</a>) |
| norm values as a single byte before being stored. At search time, |
| the norm byte value is read from the index |
| <a class="xref" href="Lucene.Net.Store.Directory.html">Directory</a> and |
| decoded (<a class="xref" href="Lucene.Net.Search.Similarities.DefaultSimilarity.html#Lucene_Net_Search_Similarities_DefaultSimilarity_DecodeNormValue_System_Int64_">DecodeNormValue(Int64)</a>) back to a float <em>norm</em> value. |
| this encoding/decoding, while reducing index size, comes with the price of |
| precision loss - it is not guaranteed that <em>Decode(Encode(x)) = x</em>. For |
| instance, <em>Decode(Encode(0.89)) = 0.75</em>. |
| <p> |
| Compression of norm values to a single byte saves memory at search time, |
| because once a field is referenced at search time, its norms - for all |
| documents - are maintained in memory. |
| <p> |
| The rationale supporting such lossy compression of norm values is that given |
| the difficulty (and inaccuracy) of users to express their true information |
| need by a query, only big differences matter. |
| <p> |
| Last, note that search time is too late to modify this <em>norm</em> part of |
| scoring, e.g. by using a different <a class="xref" href="Lucene.Net.Search.Similarities.Similarity.html">Similarity</a> for search.</p> |
| </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.TFIDFSimilarity.html">TFIDFSimilarity</a></div> |
| <div class="level3"><span class="xref">DefaultSimilarity</span></div> |
| </div> |
| <div class="inheritedMembers"> |
| <h5>Inherited Members</h5> |
| <div> |
| <a class="xref" href="Lucene.Net.Search.Similarities.TFIDFSimilarity.html#Lucene_Net_Search_Similarities_TFIDFSimilarity_IdfExplain_Lucene_Net_Search_CollectionStatistics_Lucene_Net_Search_TermStatistics_">TFIDFSimilarity.IdfExplain(CollectionStatistics, TermStatistics)</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Search.Similarities.TFIDFSimilarity.html#Lucene_Net_Search_Similarities_TFIDFSimilarity_IdfExplain_Lucene_Net_Search_CollectionStatistics_Lucene_Net_Search_TermStatistics___">TFIDFSimilarity.IdfExplain(CollectionStatistics, TermStatistics[])</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Search.Similarities.TFIDFSimilarity.html#Lucene_Net_Search_Similarities_TFIDFSimilarity_ComputeNorm_Lucene_Net_Index_FieldInvertState_">TFIDFSimilarity.ComputeNorm(FieldInvertState)</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Search.Similarities.TFIDFSimilarity.html#Lucene_Net_Search_Similarities_TFIDFSimilarity_ComputeWeight_System_Single_Lucene_Net_Search_CollectionStatistics_Lucene_Net_Search_TermStatistics___">TFIDFSimilarity.ComputeWeight(Single, CollectionStatistics, TermStatistics[])</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Search.Similarities.TFIDFSimilarity.html#Lucene_Net_Search_Similarities_TFIDFSimilarity_GetSimScorer_Lucene_Net_Search_Similarities_Similarity_SimWeight_Lucene_Net_Index_AtomicReaderContext_">TFIDFSimilarity.GetSimScorer(Similarity.SimWeight, AtomicReaderContext)</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_DefaultSimilarity_syntax">Syntax</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public class DefaultSimilarity : TFIDFSimilarity</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-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Similarities_DefaultSimilarity__ctor.md&value=---%0Auid%3A%20Lucene.Net.Search.Similarities.DefaultSimilarity.%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> |
| </span> |
| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/NightOwl888/lucenenet/blob/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Search/Similarities/DefaultSimilarity.cs/#L65">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Similarities_DefaultSimilarity__ctor_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.#ctor*"></a> |
| <h4 id="Lucene_Net_Search_Similarities_DefaultSimilarity__ctor" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.#ctor">DefaultSimilarity()</h4> |
| <div class="markdown level1 summary"><p>Sole constructor: parameter-free </p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public DefaultSimilarity()</code></pre> |
| </div> |
| <h3 id="fields">Fields |
| </h3> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Similarities_DefaultSimilarity_m_discountOverlaps.md&value=---%0Auid%3A%20Lucene.Net.Search.Similarities.DefaultSimilarity.m_discountOverlaps%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/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Search/Similarities/DefaultSimilarity.cs/#L167">View Source</a> |
| </span> |
| <h4 id="Lucene_Net_Search_Similarities_DefaultSimilarity_m_discountOverlaps" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.m_discountOverlaps">m_discountOverlaps</h4> |
| <div class="markdown level1 summary"><p><code>True</code> if overlap tokens (tokens with a position of increment of zero) are |
| discounted from the document's length.</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">protected bool m_discountOverlaps</code></pre> |
| </div> |
| <h5 class="fieldValue">Field 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.Boolean</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-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Similarities_DefaultSimilarity_DiscountOverlaps.md&value=---%0Auid%3A%20Lucene.Net.Search.Similarities.DefaultSimilarity.DiscountOverlaps%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/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Search/Similarities/DefaultSimilarity.cs/#L178">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Similarities_DefaultSimilarity_DiscountOverlaps_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.DiscountOverlaps*"></a> |
| <h4 id="Lucene_Net_Search_Similarities_DefaultSimilarity_DiscountOverlaps" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.DiscountOverlaps">DiscountOverlaps</h4> |
| <div class="markdown level1 summary"><p>Determines whether overlap tokens (Tokens with |
| 0 position increment) are ignored when computing |
| norm. By default this is true, meaning overlap |
| tokens do not count when computing norms. |
| <p> |
| <div class="lucene-block lucene-experimental">This is a Lucene.NET EXPERIMENTAL API, use at your own risk</div></div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public virtual bool DiscountOverlaps { get; set; }</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.Boolean</span></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <h5 id="Lucene_Net_Search_Similarities_DefaultSimilarity_DiscountOverlaps_seealso">See Also</h5> |
| <div class="seealso"> |
| <div><a class="xref" href="Lucene.Net.Search.Similarities.TFIDFSimilarity.html#Lucene_Net_Search_Similarities_TFIDFSimilarity_ComputeNorm_Lucene_Net_Index_FieldInvertState_">ComputeNorm</a>(<a class="xref" href="Lucene.Net.Index.FieldInvertState.html">FieldInvertState</a>)</div> |
| </div> |
| <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-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Similarities_DefaultSimilarity_Coord_System_Int32_System_Int32_.md&value=---%0Auid%3A%20Lucene.Net.Search.Similarities.DefaultSimilarity.Coord(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> |
| </span> |
| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/NightOwl888/lucenenet/blob/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Search/Similarities/DefaultSimilarity.cs/#L71">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Similarities_DefaultSimilarity_Coord_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.Coord*"></a> |
| <h4 id="Lucene_Net_Search_Similarities_DefaultSimilarity_Coord_System_Int32_System_Int32_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.Coord(System.Int32,System.Int32)">Coord(Int32, Int32)</h4> |
| <div class="markdown level1 summary"><p>Implemented as <code>overlap / maxOverlap</code>. </p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public override float Coord(int overlap, int maxOverlap)</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">overlap</span></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><span class="xref">System.Int32</span></td> |
| <td><span class="parametername">maxOverlap</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.TFIDFSimilarity.html#Lucene_Net_Search_Similarities_TFIDFSimilarity_Coord_System_Int32_System_Int32_">TFIDFSimilarity.Coord(Int32, Int32)</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-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Similarities_DefaultSimilarity_DecodeNormValue_System_Int64_.md&value=---%0Auid%3A%20Lucene.Net.Search.Similarities.DefaultSimilarity.DecodeNormValue(System.Int64)%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/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Search/Similarities/DefaultSimilarity.cs/#L105">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Similarities_DefaultSimilarity_DecodeNormValue_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.DecodeNormValue*"></a> |
| <h4 id="Lucene_Net_Search_Similarities_DefaultSimilarity_DecodeNormValue_System_Int64_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.DecodeNormValue(System.Int64)">DecodeNormValue(Int64)</h4> |
| <div class="markdown level1 summary"><p>Decodes the norm value, assuming it is a single byte.</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public override sealed float DecodeNormValue(long norm)</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.Int64</span></td> |
| <td><span class="parametername">norm</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.TFIDFSimilarity.html#Lucene_Net_Search_Similarities_TFIDFSimilarity_DecodeNormValue_System_Int64_">TFIDFSimilarity.DecodeNormValue(Int64)</a></div> |
| <h5 id="Lucene_Net_Search_Similarities_DefaultSimilarity_DecodeNormValue_System_Int64__seealso">See Also</h5> |
| <div class="seealso"> |
| <div><a class="xref" href="Lucene.Net.Search.Similarities.DefaultSimilarity.html#Lucene_Net_Search_Similarities_DefaultSimilarity_EncodeNormValue_System_Single_">EncodeNormValue(Single)</a></div> |
| </div> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Similarities_DefaultSimilarity_EncodeNormValue_System_Single_.md&value=---%0Auid%3A%20Lucene.Net.Search.Similarities.DefaultSimilarity.EncodeNormValue(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/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Search/Similarities/DefaultSimilarity.cs/#L96">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Similarities_DefaultSimilarity_EncodeNormValue_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.EncodeNormValue*"></a> |
| <h4 id="Lucene_Net_Search_Similarities_DefaultSimilarity_EncodeNormValue_System_Single_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.EncodeNormValue(System.Single)">EncodeNormValue(Single)</h4> |
| <div class="markdown level1 summary"><p>Encodes a normalization factor for storage in an index. |
| <p> |
| The encoding uses a three-bit mantissa, a five-bit exponent, and the |
| zero-exponent point at 15, thus representing values from around 7x10^9 to |
| 2x10^-9 with about one significant decimal digit of accuracy. Zero is also |
| represented. Negative numbers are rounded up to zero. Values too large to |
| represent are rounded down to the largest representable value. Positive |
| values too small to represent are rounded up to the smallest positive |
| representable value.</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public override sealed long EncodeNormValue(float f)</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">f</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.Int64</span></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <h5 class="overrides">Overrides</h5> |
| <div><a class="xref" href="Lucene.Net.Search.Similarities.TFIDFSimilarity.html#Lucene_Net_Search_Similarities_TFIDFSimilarity_EncodeNormValue_System_Single_">TFIDFSimilarity.EncodeNormValue(Single)</a></div> |
| <h5 id="Lucene_Net_Search_Similarities_DefaultSimilarity_EncodeNormValue_System_Single__seealso">See Also</h5> |
| <div class="seealso"> |
| <div><a class="xref" href="Lucene.Net.Documents.Field.html#Lucene_Net_Documents_Field_Boost">Boost</a></div> |
| <div><a class="xref" href="Lucene.Net.Util.SmallSingle.html">SmallSingle</a></div> |
| </div> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Similarities_DefaultSimilarity_Idf_System_Int64_System_Int64_.md&value=---%0Auid%3A%20Lucene.Net.Search.Similarities.DefaultSimilarity.Idf(System.Int64%2CSystem.Int64)%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/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Search/Similarities/DefaultSimilarity.cs/#L158">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Similarities_DefaultSimilarity_Idf_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.Idf*"></a> |
| <h4 id="Lucene_Net_Search_Similarities_DefaultSimilarity_Idf_System_Int64_System_Int64_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.Idf(System.Int64,System.Int64)">Idf(Int64, Int64)</h4> |
| <div class="markdown level1 summary"><p>Implemented as <code>log(numDocs/(docFreq+1)) + 1</code>. </p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public override float Idf(long docFreq, long numDocs)</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.Int64</span></td> |
| <td><span class="parametername">docFreq</span></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><span class="xref">System.Int64</span></td> |
| <td><span class="parametername">numDocs</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.TFIDFSimilarity.html#Lucene_Net_Search_Similarities_TFIDFSimilarity_Idf_System_Int64_System_Int64_">TFIDFSimilarity.Idf(Int64, Int64)</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-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Similarities_DefaultSimilarity_LengthNorm_Lucene_Net_Index_FieldInvertState_.md&value=---%0Auid%3A%20Lucene.Net.Search.Similarities.DefaultSimilarity.LengthNorm(Lucene.Net.Index.FieldInvertState)%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/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Search/Similarities/DefaultSimilarity.cs/#L121">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Similarities_DefaultSimilarity_LengthNorm_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.LengthNorm*"></a> |
| <h4 id="Lucene_Net_Search_Similarities_DefaultSimilarity_LengthNorm_Lucene_Net_Index_FieldInvertState_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.LengthNorm(Lucene.Net.Index.FieldInvertState)">LengthNorm(FieldInvertState)</h4> |
| <div class="markdown level1 summary"><p>Implemented as |
| <code>state.Boost * LengthNorm(numTerms)</code>, where |
| <code>numTerms</code> is <a class="xref" href="Lucene.Net.Index.FieldInvertState.html#Lucene_Net_Index_FieldInvertState_Length">Length</a> if |
| <a class="xref" href="Lucene.Net.Search.Similarities.DefaultSimilarity.html#Lucene_Net_Search_Similarities_DefaultSimilarity_DiscountOverlaps">DiscountOverlaps</a> is <code>false</code>, else it's |
| <a class="xref" href="Lucene.Net.Index.FieldInvertState.html#Lucene_Net_Index_FieldInvertState_Length">Length</a> - |
| <a class="xref" href="Lucene.Net.Index.FieldInvertState.html#Lucene_Net_Index_FieldInvertState_NumOverlap">NumOverlap</a>.</p> |
| <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 level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public override float LengthNorm(FieldInvertState state)</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.Index.FieldInvertState.html">FieldInvertState</a></td> |
| <td><span class="parametername">state</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.TFIDFSimilarity.html#Lucene_Net_Search_Similarities_TFIDFSimilarity_LengthNorm_Lucene_Net_Index_FieldInvertState_">TFIDFSimilarity.LengthNorm(FieldInvertState)</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-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Similarities_DefaultSimilarity_QueryNorm_System_Single_.md&value=---%0Auid%3A%20Lucene.Net.Search.Similarities.DefaultSimilarity.QueryNorm(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/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Search/Similarities/DefaultSimilarity.cs/#L78">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Similarities_DefaultSimilarity_QueryNorm_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.QueryNorm*"></a> |
| <h4 id="Lucene_Net_Search_Similarities_DefaultSimilarity_QueryNorm_System_Single_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.QueryNorm(System.Single)">QueryNorm(Single)</h4> |
| <div class="markdown level1 summary"><p>Implemented as <code>1/sqrt(sumOfSquaredWeights)</code>. </p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public override float QueryNorm(float sumOfSquaredWeights)</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">sumOfSquaredWeights</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.TFIDFSimilarity.html#Lucene_Net_Search_Similarities_TFIDFSimilarity_QueryNorm_System_Single_">TFIDFSimilarity.QueryNorm(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-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Similarities_DefaultSimilarity_ScorePayload_System_Int32_System_Int32_System_Int32_Lucene_Net_Util_BytesRef_.md&value=---%0Auid%3A%20Lucene.Net.Search.Similarities.DefaultSimilarity.ScorePayload(System.Int32%2CSystem.Int32%2CSystem.Int32%2CLucene.Net.Util.BytesRef)%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/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Search/Similarities/DefaultSimilarity.cs/#L151">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Similarities_DefaultSimilarity_ScorePayload_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.ScorePayload*"></a> |
| <h4 id="Lucene_Net_Search_Similarities_DefaultSimilarity_ScorePayload_System_Int32_System_Int32_System_Int32_Lucene_Net_Util_BytesRef_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.ScorePayload(System.Int32,System.Int32,System.Int32,Lucene.Net.Util.BytesRef)">ScorePayload(Int32, Int32, Int32, BytesRef)</h4> |
| <div class="markdown level1 summary"><p>The default implementation returns <code>1</code> </p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public override float ScorePayload(int doc, int start, int end, BytesRef payload)</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">doc</span></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><span class="xref">System.Int32</span></td> |
| <td><span class="parametername">start</span></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><span class="xref">System.Int32</span></td> |
| <td><span class="parametername">end</span></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><a class="xref" href="Lucene.Net.Util.BytesRef.html">BytesRef</a></td> |
| <td><span class="parametername">payload</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.TFIDFSimilarity.html#Lucene_Net_Search_Similarities_TFIDFSimilarity_ScorePayload_System_Int32_System_Int32_System_Int32_Lucene_Net_Util_BytesRef_">TFIDFSimilarity.ScorePayload(Int32, Int32, Int32, BytesRef)</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-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Similarities_DefaultSimilarity_SloppyFreq_System_Int32_.md&value=---%0Auid%3A%20Lucene.Net.Search.Similarities.DefaultSimilarity.SloppyFreq(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> |
| </span> |
| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/NightOwl888/lucenenet/blob/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Search/Similarities/DefaultSimilarity.cs/#L144">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Similarities_DefaultSimilarity_SloppyFreq_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.SloppyFreq*"></a> |
| <h4 id="Lucene_Net_Search_Similarities_DefaultSimilarity_SloppyFreq_System_Int32_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.SloppyFreq(System.Int32)">SloppyFreq(Int32)</h4> |
| <div class="markdown level1 summary"><p>Implemented as <code>1 / (distance + 1)</code>. </p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public override float SloppyFreq(int distance)</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">distance</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.TFIDFSimilarity.html#Lucene_Net_Search_Similarities_TFIDFSimilarity_SloppyFreq_System_Int32_">TFIDFSimilarity.SloppyFreq(Int32)</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-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Similarities_DefaultSimilarity_Tf_System_Single_.md&value=---%0Auid%3A%20Lucene.Net.Search.Similarities.DefaultSimilarity.Tf(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/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Search/Similarities/DefaultSimilarity.cs/#L137">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Similarities_DefaultSimilarity_Tf_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.Tf*"></a> |
| <h4 id="Lucene_Net_Search_Similarities_DefaultSimilarity_Tf_System_Single_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.Tf(System.Single)">Tf(Single)</h4> |
| <div class="markdown level1 summary"><p>Implemented as <code>Math.Sqrt(freq)</code>. </p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public override float Tf(float freq)</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">freq</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.TFIDFSimilarity.html#Lucene_Net_Search_Similarities_TFIDFSimilarity_Tf_System_Single_">TFIDFSimilarity.Tf(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-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Similarities_DefaultSimilarity_ToString.md&value=---%0Auid%3A%20Lucene.Net.Search.Similarities.DefaultSimilarity.ToString%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/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Search/Similarities/DefaultSimilarity.cs/#L184">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Similarities_DefaultSimilarity_ToString_" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.ToString*"></a> |
| <h4 id="Lucene_Net_Search_Similarities_DefaultSimilarity_ToString" data-uid="Lucene.Net.Search.Similarities.DefaultSimilarity.ToString">ToString()</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 ToString()</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><span class="xref">System.Object.ToString()</span></div> |
| </article> |
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