mirror of
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richard-churchman
cc0a2bee21
Included open-source Accord.net library code natively to the solution given the deprecated state of that project. Accord.net will be supported inside Jube for own needs (such as upgrading to .Net 7+). Accord.net libraries modified to compile to .Net 6. Modified Accord.net libraries to better support Newtonsoft Json.net serialisation. Included annotations in the Accord.net libraries to house important dependency statistics. Serialised json can be used independently of Jube to recall a Neural Network. Removal of Binary Serializer totally as a precursor to the projects support of .Net 7+. Extensive bug fixing in crucial functions of Neural Network training and recall. While this part of the system remains in Alpha, it is substantially more fit for purpose.
90 lines
2.8 KiB
C#
90 lines
2.8 KiB
C#
// Accord Statistics Library
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// The Accord.NET Framework
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// http://accord-framework.net
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//
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// Copyright © César Souza, 2009-2017
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// cesarsouza at gmail.com
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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//
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namespace Accord.Statistics.Kernels
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{
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using System;
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using Accord.Compat;
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/// <summary>
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/// Generalized Histogram Intersection Kernel.
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/// </summary>
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///
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/// <remarks>
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/// The Generalized Histogram Intersection kernel is built based on the
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/// Histogram Intersection Kernel for image classification but applies
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/// in a much larger variety of contexts (Boughorbel, 2005).
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/// </remarks>
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///
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[Serializable]
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public sealed class HistogramIntersection : KernelBase, IKernel, ICloneable
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{
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private double alpha;
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private double beta;
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/// <summary>
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/// Constructs a new Generalized Histogram Intersection Kernel.
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/// </summary>
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///
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public HistogramIntersection(double alpha = 1, double beta = 1)
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{
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this.alpha = alpha;
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this.beta = beta;
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}
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/// <summary>
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/// Generalized Histogram Intersection Kernel Function
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/// </summary>
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///
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/// <param name="x">Vector <c>x</c> in input space.</param>
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/// <param name="y">Vector <c>y</c> in input space.</param>
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/// <returns>Dot product in feature (kernel) space.</returns>
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///
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public override double Function(double[] x, double[] y)
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{
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double sum = 0.0;
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for (int i = 0; i < x.Length; i++)
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{
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sum += System.Math.Min(
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System.Math.Pow(System.Math.Abs(x[i]), alpha),
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System.Math.Pow(System.Math.Abs(y[i]), beta));
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}
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return sum;
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}
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/// <summary>
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/// Creates a new object that is a copy of the current instance.
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/// </summary>
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///
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/// <returns>
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/// A new object that is a copy of this instance.
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/// </returns>
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///
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public object Clone()
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{
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return MemberwiseClone();
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}
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}
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}
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