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Neural Networks on C#

, 19 Nov 2006
The articles describes a C# library for neural network computations, and their application for several problem solving.
Prize winner in Competition "C# Oct 2006"
neuro_demo.zip
neuro_demo
Back Propagation
Approximation
AForge.Controls.dll
AForge.dll
AForge.Neuro.dll
Approximation.exe
Data Samples
sample1.csv
sample2.csv
TimeSeries
AForge.Controls.dll
AForge.dll
AForge.Neuro.dll
Data Samples
exponent.csv
growing sinusoid.csv
parabola.csv
sigmoid.csv
sinusoid.csv
TimeSeries.exe
XORProblem
AForge.Controls.dll
AForge.dll
AForge.Neuro.dll
XORProblem.exe
Simple
Delta Rule Learning
AForge.Controls.dll
AForge.dll
AForge.Neuro.dll
Classifier.exe
Data Samples
and.csv
cube.csv
or.csv
sample1.csv
sample2.csv
One-Layer Perceptron Classifier
AForge.Controls.dll
AForge.dll
AForge.Neuro.dll
Classifier.exe
Data Samples
sample1.csv
sample2.csv
Perceptron Classifier
AForge.Controls.dll
AForge.dll
AForge.Neuro.dll
Classifier.exe
Data Samples
and.csv
cube.csv
or.csv
SOM
2DOrganizing
2DOrganizing.exe
AForge.dll
AForge.Neuro.dll
Color
AForge.dll
AForge.Neuro.dll
Color.exe
TSP
AForge.Controls.dll
AForge.dll
AForge.Neuro.dll
TSP.exe
neuro_src.zip
neuro_src
Docs
AForge.Core.chm
AForge.Neuro.chm
Release
AForge.Controls.dll
AForge.dll
AForge.Neuro.dll
Samples
Neuro
Back Propagation
Approximation
App.ico
Data Samples
sample1.csv
sample2.csv
TimeSeries
App.ico
Data Samples
exponent.csv
growing sinusoid.csv
parabola.csv
sigmoid.csv
sinusoid.csv
XORProblem
App.ico
Simple
Delta Rule Learning
App.ico
Data Samples
and.csv
cube.csv
or.csv
sample1.csv
sample2.csv
One-Layer Perceptron Classifier
App.ico
Data Samples
sample1.csv
sample2.csv
Perceptron Classifier
App.ico
Data Samples
and.csv
cube.csv
or.csv
SOM
2DOrganizing
App.ico
Color
App.ico
TSP
App.ico
Sources
Controls
Core
Neuro
Activation Functions
Images
sigmoid.bmp
sigmoid_bipolar.bmp
threshold.bmp
Layers
Learning
Networks
Neurons
// AForge Framework
// Kohonen SOM 2D Organizing
//
// Copyright � Andrew Kirillov, 2006
// andrew.kirillov@gmail.com
//

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Threading;

using AForge;
using AForge.Neuro;
using AForge.Neuro.Learning;

namespace SOMOrganizing
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class MainForm : System.Windows.Forms.Form
	{
		private System.Windows.Forms.GroupBox groupBox1;
		private System.Windows.Forms.Button generateButton;
		private System.Windows.Forms.Panel pointsPanel;
		private System.Windows.Forms.GroupBox groupBox2;
		private System.Windows.Forms.Panel mapPanel;
		private System.Windows.Forms.CheckBox showConnectionsCheck;
		private System.Windows.Forms.CheckBox showInactiveCheck;
		private System.Windows.Forms.GroupBox groupBox3;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.TextBox sizeBox;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.Label label3;
		private System.Windows.Forms.TextBox radiusBox;
		private System.Windows.Forms.Label label4;
		private System.Windows.Forms.TextBox rateBox;
		private System.Windows.Forms.Label label5;
		private System.Windows.Forms.TextBox iterationsBox;
		private System.Windows.Forms.Label label6;
		private System.Windows.Forms.Label label7;
		private System.Windows.Forms.TextBox currentIterationBox;
		private System.Windows.Forms.Label label8;
		private System.Windows.Forms.Button stopButton;
		private System.Windows.Forms.Button startButton;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;


		private const int	groupRadius = 20;
		private const int	pointsCount = 100;
		private int[,]		points = new int[pointsCount, 2];	// x, y
		private double[][]	trainingSet = new double[pointsCount][];
		private int[,,]		map;

		private int			networkSize		= 15;
		private int			iterations		= 500;
		private double		learningRate	= 0.3;
		private int			learningRadius	= 3;

		private Random		rand = new Random( );
		private Thread		workerThread = null;
		private bool		needToStop = false;

		// Constructor
		public MainForm( )
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent( );

			//
			GeneratePoints( );
			UpdateSettings( );
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if ( components != null ) 
				{
					components.Dispose( );
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.groupBox1 = new System.Windows.Forms.GroupBox();
			this.generateButton = new System.Windows.Forms.Button();
			this.pointsPanel = new BufferedPanel();
			this.groupBox2 = new System.Windows.Forms.GroupBox();
			this.showInactiveCheck = new System.Windows.Forms.CheckBox();
			this.showConnectionsCheck = new System.Windows.Forms.CheckBox();
			this.mapPanel = new BufferedPanel();
			this.groupBox3 = new System.Windows.Forms.GroupBox();
			this.stopButton = new System.Windows.Forms.Button();
			this.startButton = new System.Windows.Forms.Button();
			this.currentIterationBox = new System.Windows.Forms.TextBox();
			this.label8 = new System.Windows.Forms.Label();
			this.label7 = new System.Windows.Forms.Label();
			this.radiusBox = new System.Windows.Forms.TextBox();
			this.label4 = new System.Windows.Forms.Label();
			this.rateBox = new System.Windows.Forms.TextBox();
			this.label5 = new System.Windows.Forms.Label();
			this.iterationsBox = new System.Windows.Forms.TextBox();
			this.label6 = new System.Windows.Forms.Label();
			this.label3 = new System.Windows.Forms.Label();
			this.label2 = new System.Windows.Forms.Label();
			this.sizeBox = new System.Windows.Forms.TextBox();
			this.label1 = new System.Windows.Forms.Label();
			this.groupBox1.SuspendLayout();
			this.groupBox2.SuspendLayout();
			this.groupBox3.SuspendLayout();
			this.SuspendLayout();
			// 
			// groupBox1
			// 
			this.groupBox1.Controls.Add(this.generateButton);
			this.groupBox1.Controls.Add(this.pointsPanel);
			this.groupBox1.Location = new System.Drawing.Point(10, 10);
			this.groupBox1.Name = "groupBox1";
			this.groupBox1.Size = new System.Drawing.Size(220, 295);
			this.groupBox1.TabIndex = 0;
			this.groupBox1.TabStop = false;
			this.groupBox1.Text = "Points";
			// 
			// generateButton
			// 
			this.generateButton.Location = new System.Drawing.Point(10, 260);
			this.generateButton.Name = "generateButton";
			this.generateButton.TabIndex = 1;
			this.generateButton.Text = "&Generate";
			this.generateButton.Click += new System.EventHandler(this.generateButton_Click);
			// 
			// pointsPanel
			// 
			this.pointsPanel.BackColor = System.Drawing.Color.White;
			this.pointsPanel.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
			this.pointsPanel.Location = new System.Drawing.Point(10, 20);
			this.pointsPanel.Name = "pointsPanel";
			this.pointsPanel.Size = new System.Drawing.Size(200, 200);
			this.pointsPanel.TabIndex = 0;
			this.pointsPanel.Paint += new System.Windows.Forms.PaintEventHandler(this.pointsPanel_Paint);
			// 
			// groupBox2
			// 
			this.groupBox2.Controls.Add(this.showInactiveCheck);
			this.groupBox2.Controls.Add(this.showConnectionsCheck);
			this.groupBox2.Controls.Add(this.mapPanel);
			this.groupBox2.Location = new System.Drawing.Point(240, 10);
			this.groupBox2.Name = "groupBox2";
			this.groupBox2.Size = new System.Drawing.Size(220, 295);
			this.groupBox2.TabIndex = 1;
			this.groupBox2.TabStop = false;
			this.groupBox2.Text = "Map";
			// 
			// showInactiveCheck
			// 
			this.showInactiveCheck.Checked = true;
			this.showInactiveCheck.CheckState = System.Windows.Forms.CheckState.Checked;
			this.showInactiveCheck.Location = new System.Drawing.Point(10, 265);
			this.showInactiveCheck.Name = "showInactiveCheck";
			this.showInactiveCheck.Size = new System.Drawing.Size(160, 16);
			this.showInactiveCheck.TabIndex = 2;
			this.showInactiveCheck.Text = "Show Inactive Neurons";
			this.showInactiveCheck.CheckedChanged += new System.EventHandler(this.showInactiveCheck_CheckedChanged);
			// 
			// showConnectionsCheck
			// 
			this.showConnectionsCheck.Checked = true;
			this.showConnectionsCheck.CheckState = System.Windows.Forms.CheckState.Checked;
			this.showConnectionsCheck.Location = new System.Drawing.Point(10, 240);
			this.showConnectionsCheck.Name = "showConnectionsCheck";
			this.showConnectionsCheck.Size = new System.Drawing.Size(150, 16);
			this.showConnectionsCheck.TabIndex = 1;
			this.showConnectionsCheck.Text = "Show Connections";
			this.showConnectionsCheck.CheckedChanged += new System.EventHandler(this.showConnectionsCheck_CheckedChanged);
			// 
			// mapPanel
			// 
			this.mapPanel.BackColor = System.Drawing.Color.White;
			this.mapPanel.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
			this.mapPanel.Location = new System.Drawing.Point(10, 20);
			this.mapPanel.Name = "mapPanel";
			this.mapPanel.Size = new System.Drawing.Size(200, 200);
			this.mapPanel.TabIndex = 0;
			this.mapPanel.Paint += new System.Windows.Forms.PaintEventHandler(this.mapPanel_Paint);
			// 
			// groupBox3
			// 
			this.groupBox3.Controls.Add(this.stopButton);
			this.groupBox3.Controls.Add(this.startButton);
			this.groupBox3.Controls.Add(this.currentIterationBox);
			this.groupBox3.Controls.Add(this.label8);
			this.groupBox3.Controls.Add(this.label7);
			this.groupBox3.Controls.Add(this.radiusBox);
			this.groupBox3.Controls.Add(this.label4);
			this.groupBox3.Controls.Add(this.rateBox);
			this.groupBox3.Controls.Add(this.label5);
			this.groupBox3.Controls.Add(this.iterationsBox);
			this.groupBox3.Controls.Add(this.label6);
			this.groupBox3.Controls.Add(this.label3);
			this.groupBox3.Controls.Add(this.label2);
			this.groupBox3.Controls.Add(this.sizeBox);
			this.groupBox3.Controls.Add(this.label1);
			this.groupBox3.Location = new System.Drawing.Point(470, 10);
			this.groupBox3.Name = "groupBox3";
			this.groupBox3.Size = new System.Drawing.Size(180, 295);
			this.groupBox3.TabIndex = 2;
			this.groupBox3.TabStop = false;
			this.groupBox3.Text = "Neural Network";
			// 
			// stopButton
			// 
			this.stopButton.Enabled = false;
			this.stopButton.Location = new System.Drawing.Point(95, 260);
			this.stopButton.Name = "stopButton";
			this.stopButton.TabIndex = 16;
			this.stopButton.Text = "S&top";
			this.stopButton.Click += new System.EventHandler(this.stopButton_Click);
			// 
			// startButton
			// 
			this.startButton.Location = new System.Drawing.Point(10, 260);
			this.startButton.Name = "startButton";
			this.startButton.TabIndex = 15;
			this.startButton.Text = "&Start";
			this.startButton.Click += new System.EventHandler(this.startButton_Click);
			// 
			// currentIterationBox
			// 
			this.currentIterationBox.Location = new System.Drawing.Point(110, 160);
			this.currentIterationBox.Name = "currentIterationBox";
			this.currentIterationBox.ReadOnly = true;
			this.currentIterationBox.Size = new System.Drawing.Size(60, 20);
			this.currentIterationBox.TabIndex = 14;
			this.currentIterationBox.Text = "";
			// 
			// label8
			// 
			this.label8.Location = new System.Drawing.Point(10, 162);
			this.label8.Name = "label8";
			this.label8.Size = new System.Drawing.Size(100, 16);
			this.label8.TabIndex = 13;
			this.label8.Text = "Curren iteration:";
			// 
			// label7
			// 
			this.label7.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
			this.label7.Location = new System.Drawing.Point(10, 148);
			this.label7.Name = "label7";
			this.label7.Size = new System.Drawing.Size(160, 2);
			this.label7.TabIndex = 12;
			// 
			// radiusBox
			// 
			this.radiusBox.Location = new System.Drawing.Point(110, 120);
			this.radiusBox.Name = "radiusBox";
			this.radiusBox.Size = new System.Drawing.Size(60, 20);
			this.radiusBox.TabIndex = 11;
			this.radiusBox.Text = "";
			// 
			// label4
			// 
			this.label4.Location = new System.Drawing.Point(10, 122);
			this.label4.Name = "label4";
			this.label4.Size = new System.Drawing.Size(100, 16);
			this.label4.TabIndex = 10;
			this.label4.Text = "Initial radius:";
			// 
			// rateBox
			// 
			this.rateBox.Location = new System.Drawing.Point(110, 95);
			this.rateBox.Name = "rateBox";
			this.rateBox.Size = new System.Drawing.Size(60, 20);
			this.rateBox.TabIndex = 9;
			this.rateBox.Text = "";
			// 
			// label5
			// 
			this.label5.Location = new System.Drawing.Point(10, 97);
			this.label5.Name = "label5";
			this.label5.Size = new System.Drawing.Size(100, 16);
			this.label5.TabIndex = 8;
			this.label5.Text = "Initial learning rate:";
			// 
			// iterationsBox
			// 
			this.iterationsBox.Location = new System.Drawing.Point(110, 70);
			this.iterationsBox.Name = "iterationsBox";
			this.iterationsBox.Size = new System.Drawing.Size(60, 20);
			this.iterationsBox.TabIndex = 7;
			this.iterationsBox.Text = "";
			// 
			// label6
			// 
			this.label6.Location = new System.Drawing.Point(10, 72);
			this.label6.Name = "label6";
			this.label6.Size = new System.Drawing.Size(60, 16);
			this.label6.TabIndex = 6;
			this.label6.Text = "Iteraions:";
			// 
			// label3
			// 
			this.label3.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
			this.label3.Location = new System.Drawing.Point(10, 60);
			this.label3.Name = "label3";
			this.label3.Size = new System.Drawing.Size(160, 2);
			this.label3.TabIndex = 3;
			// 
			// label2
			// 
			this.label2.Location = new System.Drawing.Point(10, 41);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(150, 15);
			this.label2.TabIndex = 2;
			this.label2.Text = "(neurons count = size * size)";
			// 
			// sizeBox
			// 
			this.sizeBox.Location = new System.Drawing.Point(110, 20);
			this.sizeBox.Name = "sizeBox";
			this.sizeBox.Size = new System.Drawing.Size(60, 20);
			this.sizeBox.TabIndex = 1;
			this.sizeBox.Text = "";
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(10, 22);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(54, 16);
			this.label1.TabIndex = 0;
			this.label1.Text = "Size:";
			// 
			// MainForm
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(659, 315);
			this.Controls.Add(this.groupBox3);
			this.Controls.Add(this.groupBox2);
			this.Controls.Add(this.groupBox1);
			this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
			this.MaximizeBox = false;
			this.Name = "MainForm";
			this.Text = "Kohonen SOM 2D Organizing";
			this.Closing += new System.ComponentModel.CancelEventHandler(this.MainForm_Closing);
			this.groupBox1.ResumeLayout(false);
			this.groupBox2.ResumeLayout(false);
			this.groupBox3.ResumeLayout(false);
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main( ) 
		{
			Application.Run( new MainForm( ) );
		}

		// On main form closing
		private void MainForm_Closing(object sender, System.ComponentModel.CancelEventArgs e)
		{
			// check if worker thread is running
			if ( ( workerThread != null ) && ( workerThread.IsAlive ) )
			{
				needToStop = true;
				workerThread.Join( );
			}
		}

		// Update settings controls
		private void UpdateSettings( )
		{
			sizeBox.Text		= networkSize.ToString( );
			iterationsBox.Text	= iterations.ToString( );
			rateBox.Text		= learningRate.ToString( );
			radiusBox.Text		= learningRadius.ToString( );
		}

		// On "Generate" button click
		private void generateButton_Click(object sender, System.EventArgs e)
		{
			GeneratePoints( );
		}

		// Generate point
		private void GeneratePoints( )
		{
			int width	= pointsPanel.ClientRectangle.Width;
			int height	= pointsPanel.ClientRectangle.Height;
			int diameter = groupRadius * 2;

			// generate groups of ten points
			for ( int i = 0; i < pointsCount; )
			{
				int cx = rand.Next( width );
				int cy = rand.Next( height );

				// generate group
				for ( int j = 0 ; ( i < pointsCount ) && ( j < 10 ); )
				{
					int x = cx + rand.Next( diameter ) - groupRadius;
					int y = cy + rand.Next( diameter ) - groupRadius;

					// check if wee are not out
					if ( ( x < 0 ) || ( y < 0 ) || ( x >= width ) || ( y >= height ) )
					{
						continue;
					}

					// add point
					points[i, 0] = x;
					points[i, 1] = y;

					j++;
					i++;
				}
			}

			map = null;
			pointsPanel.Invalidate( );
			mapPanel.Invalidate( );
		}

		// Paint points
		private void pointsPanel_Paint( object sender, System.Windows.Forms.PaintEventArgs e )
		{
			Graphics g = e.Graphics;

			using ( Brush brush = new SolidBrush( Color.Blue ) )
			{
				// draw all points
				for ( int i = 0, n = points.GetLength( 0 ); i < n; i++ )
				{
					g.FillEllipse( brush, points[i, 0] - 2, points[i, 1] - 2, 5, 5 );
				}
			}
		}

		// Paint map
		private void mapPanel_Paint( object sender, System.Windows.Forms.PaintEventArgs e )
		{
			Graphics g = e.Graphics;

			if ( map != null )
			{
				//
				bool showConnections = showConnectionsCheck.Checked;
				bool showInactive = showInactiveCheck.Checked;

				// pens and brushes
				Brush brush = new SolidBrush( Color.Blue );
				Brush brushGray = new SolidBrush( Color.FromArgb( 192, 192, 192 ) );
				Pen pen = new Pen( Color.Blue, 1 );
				Pen penGray = new Pen( Color.FromArgb( 192, 192, 192 ), 1 );

				// lock
				Monitor.Enter( this );

				if ( showConnections )
				{
					// draw connections
					for ( int i = 0, n = map.GetLength( 0 ); i < n; i++ )
					{
						for ( int j = 0, k = map.GetLength( 1 ); j < k; j++ )
						{
							if ( ( !showInactive ) && ( map[i, j, 2] == 0 ) )
								continue;

							// left
							if ( ( i > 0 ) && ( ( showInactive ) || ( map[i - 1, j, 2] == 1 ) ) )
							{
								g.DrawLine( ( ( map[i, j, 2] == 0 ) || ( map[i - 1, j, 2] == 0 ) ) ? penGray : pen, map[i, j, 0], map[i, j, 1], map[i - 1, j, 0], map[i - 1, j, 1] );
							}

							// right
							if ( ( i < n - 1 ) && ( ( showInactive ) || ( map[i + 1, j, 2] == 1 ) ) )
							{
								g.DrawLine( ( ( map[i, j, 2] == 0 ) || ( map[i + 1, j, 2] == 0 ) ) ? penGray : pen, map[i, j, 0], map[i, j, 1], map[i + 1, j, 0], map[i + 1, j, 1] );
							}

							// top
							if ( ( j > 0 ) && ( ( showInactive ) || ( map[i, j - 1, 2] == 1 ) ) )
							{
								g.DrawLine( ( ( map[i, j, 2] == 0 ) || ( map[i, j - 1, 2] == 0 ) ) ? penGray : pen, map[i, j, 0], map[i, j, 1], map[i, j - 1, 0], map[i, j - 1, 1] );
							}

							// bottom
							if ( ( j < k - 1 ) && ( ( showInactive ) || ( map[i, j + 1, 2] == 1 ) ) )
							{
								g.DrawLine( ( ( map[i, j, 2] == 0 ) || ( map[i, j + 1, 2] == 0 ) ) ? penGray : pen, map[i, j, 0], map[i, j, 1], map[i, j + 1, 0], map[i, j + 1, 1] );
							}
						}
					}
				}

				// draw the map
				for ( int i = 0, n = map.GetLength( 0 ); i < n; i++ )
				{
					for ( int j = 0, k = map.GetLength( 1 ); j < k; j++ )
					{
						if ( ( !showInactive ) && ( map[i, j, 2] == 0 ) )
							continue;

						// draw the point
						g.FillEllipse( ( map[i, j, 2] == 0 ) ? brushGray : brush, map[i, j, 0] - 2, map[i, j, 1] - 2, 5, 5 );
					}
				}

				// unlock
				Monitor.Exit( this );

				brush.Dispose( );
				brushGray.Dispose( );
				pen.Dispose( );
				penGray.Dispose( );
			}
		}

		// Enable/disale controls
		private void EnableControls( bool enable )
		{
			sizeBox.Enabled			= enable;
			iterationsBox.Enabled	= enable;
			rateBox.Enabled			= enable;
			radiusBox.Enabled		= enable;

			startButton.Enabled		= enable;
			generateButton.Enabled	= enable;
			stopButton.Enabled		= !enable;
		}

		// Show/hide connections on map
		private void showConnectionsCheck_CheckedChanged(object sender, System.EventArgs e)
		{
			mapPanel.Invalidate( );
		}

		// Show/hide inactive neurons on map
		private void showInactiveCheck_CheckedChanged(object sender, System.EventArgs e)
		{
			mapPanel.Invalidate( );
		}

		// On "Start" button click
		private void startButton_Click(object sender, System.EventArgs e)
		{
			// get network size
			try
			{
				networkSize = Math.Max( 5, Math.Min( 50, int.Parse( sizeBox.Text ) ) );
			}
			catch
			{
				networkSize = 15;
			}
			// get iterations count
			try
			{
				iterations = Math.Max( 10, Math.Min( 1000000, int.Parse( iterationsBox.Text ) ) );
			}
			catch
			{
				iterations = 500;
			}
			// get learning rate
			try
			{
				learningRate = Math.Max( 0.00001, Math.Min( 1.0, double.Parse( rateBox.Text ) ) );
			}
			catch
			{
				learningRate = 0.3;
			}
			// get radius
			try
			{
				learningRadius = Math.Max( 1, Math.Min( 30, int.Parse( radiusBox.Text ) ) );
			}
			catch
			{
				learningRadius = 3;
			}
			// update settings controls
			UpdateSettings( );

			// disable all settings controls except "Stop" button
			EnableControls( false );

			// generate training set
			for ( int i = 0; i < pointsCount; i++ )
			{
				// create new training sample
				trainingSet[i] = new double[2] { points[i, 0], points[i, 1] };
			}
		
			// run worker thread
			needToStop = false;
			workerThread = new Thread( new ThreadStart( SearchSolution ) );
			workerThread.Start( );
		}

		// On "Stop" button click
		private void stopButton_Click(object sender, System.EventArgs e)
		{
			// stop worker thread
			needToStop = true;
			workerThread.Join( );
			workerThread = null;
		}

		// Worker thread
		void SearchSolution( )
		{
			// set random generators range
			Neuron.RandRange = new DoubleRange( 0, Math.Max( pointsPanel.ClientRectangle.Width, pointsPanel.ClientRectangle.Height ) );

			// create network
			DistanceNetwork network = new DistanceNetwork( 2, networkSize * networkSize );

			// create learning algorithm
			SOMLearning	trainer = new SOMLearning( network, networkSize, networkSize );

			// create map
			map = new int[networkSize, networkSize, 3];

			double	fixedLearningRate = learningRate / 10;
			double	driftingLearningRate = fixedLearningRate * 9;

			// iterations
			int i = 0;

			// loop
			while ( !needToStop )
			{
				trainer.LearningRate = driftingLearningRate * ( iterations - i ) / iterations + fixedLearningRate;
				trainer.LearningRadius = (double) learningRadius * ( iterations - i ) / iterations;

				// run training epoch
				trainer.RunEpoch( trainingSet );

				// update map
				UpdateMap( network );

				// increase current iteration
				i++;

				// set current iteration's info
				currentIterationBox.Text = i.ToString( );

				// stop ?
				if ( i >= iterations )
					break;
			}

			// enable settings controls
			EnableControls( true );
		}

		// Update map
		private void UpdateMap( DistanceNetwork network )
		{
			// get first layer
			Layer layer = network[0];

			// lock
			Monitor.Enter( this );

			// run through all neurons
			for ( int i = 0, n = layer.NeuronsCount; i < n; i++ )
			{
				Neuron neuron = layer[i];

				int x = i % networkSize;
				int y = i / networkSize;

				map[y, x, 0] = (int) neuron[0];
				map[y, x, 1] = (int) neuron[1];
				map[y, x, 2] = 0;
			}

			// collect active neurons
			for ( int i = 0; i < pointsCount; i++ )
			{
				network.Compute( trainingSet[i] );
				int w = network.GetWinner( );

				map[w / networkSize, w % networkSize, 2] = 1;
			}

			// unlock
			Monitor.Exit( this );

			//
			mapPanel.Invalidate( );
		}
	}
}

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About the Author

Andrew Kirillov
Software Developer (Senior) Cisco Systems
United Kingdom United Kingdom
Started software development at about 15 years old and it seems like now it lasts most part of my life. Fortunately did not spend too much time with Z80 and BK0010 and switched to 8086 and further. Similar with programming languages – luckily managed to get away from BASIC and Pascal to things like Assembler, C, C++ and then C#. Apart from daily programming for food, do it also for hobby, where mostly enjoy areas like Computer Vision, Robotics and AI. This led to some open source stuff like AForge.NET.
 
Going out of computers I am just a man loving his family, enjoying traveling, a bit of books, a bit of movies and a mixture of everything else. Always wanted to learn playing guitar, but it seems like 6 strings are much harder than few dozens of keyboard’s keys. Will keep progressing ...

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