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NormalizationH3.cs
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NormalizationH3.cs
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namespace Lucene.Net.Search.Similarities
{
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/// <summary>
/// Dirichlet Priors normalization
/// <para/>
/// @lucene.experimental
/// </summary>
public class NormalizationH3 : Normalization
{
private readonly float mu;
/// <summary>
/// Calls <see cref="T:NormalizationH3(800)"/>
/// </summary>
public NormalizationH3()
: this(800F)
{
}
/// <summary>
/// Creates <see cref="NormalizationH3"/> with the supplied parameter <c>μ</c>. </summary>
/// <param name="mu"> smoothing parameter <c>μ</c> </param>
public NormalizationH3(float mu)
{
this.mu = mu;
}
public override float Tfn(BasicStats stats, float tf, float len)
{
return (tf + mu * ((stats.TotalTermFreq + 1F) / (stats.NumberOfFieldTokens + 1F))) / (len + mu) * mu;
}
public override string ToString()
{
return "3(" + mu + ")";
}
/// <summary>
/// Returns the parameter <c>μ</c> </summary>
/// <seealso cref="NormalizationH3(float)"/>
public virtual float Mu => mu;
}
}