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LambdaTTF.cs
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LambdaTTF.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>
/// Computes lambda as <c>totalTermFreq+1 / numberOfDocuments+1</c>.
/// <para/>
/// @lucene.experimental
/// </summary>
public class LambdaTTF : Lambda
{
/// <summary>
/// Sole constructor: parameter-free </summary>
public LambdaTTF()
{
}
public override sealed float CalculateLambda(BasicStats stats)
{
return (stats.TotalTermFreq + 1F) / (stats.NumberOfDocuments + 1F);
}
public override sealed Explanation Explain(BasicStats stats)
{
Explanation result = new Explanation();
result.Description = this.GetType().Name + ", computed from: ";
result.Value = CalculateLambda(stats);
result.AddDetail(new Explanation(stats.TotalTermFreq, "totalTermFreq"));
result.AddDetail(new Explanation(stats.NumberOfDocuments, "numberOfDocuments"));
return result;
}
public override string ToString()
{
return "L";
}
}
}