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.
79 lines
2.6 KiB
C#
79 lines
2.6 KiB
C#
// Accord Neural Net 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.Neuro.Visualization
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{
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using Accord.Math;
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/// <summary>
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/// Activation-Maximization method for visualizing neuron's roles.
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/// </summary>
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///
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public class ActivationMaximization
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{
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ActivationNeuron neuron;
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/// <summary>
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/// Initializes a new instance of the <see cref="ActivationMaximization"/> class.
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/// </summary>
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///
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/// <param name="neuron">The neuron to be visualized.</param>
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///
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public ActivationMaximization(ActivationNeuron neuron)
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{
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this.neuron = neuron;
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}
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/// <summary>
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/// Finds the value which maximizes
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/// the activation of this neuron.
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/// </summary>
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///
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public double[] Maximize()
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{
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// Initialize
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double[] value = new double[neuron.InputsCount];
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for (int i = 0; i < value.Length; i++)
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value[i] = Accord.Math.Random.Generator.Random.NextDouble();
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double[] gradient = new double[neuron.InputsCount];
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for (int iter = 0; iter < 50; iter++)
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{
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// Compute the activation gradient
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double activation = neuron.Compute(value);
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for (int i = 0; i < gradient.Length; i++)
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gradient[i] = neuron.Weights[i] * neuron.ActivationFunction.Derivative2(activation);
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// Walk against the gradient
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for (int i = 0; i < value.Length; i++)
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value[i] -= gradient[i];
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value = value.Divide(value.Sum());
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}
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return value;
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}
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}
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}
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