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demo1-8units.html
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<!DOCTYPE html>
<HTML lang="en">
<HEAD>
<TITLE>The SOM algorithm demonstration</TITLE>
<link rel="stylesheet" href="style.css">
</HEAD>
<BODY>
<h1>The SOM algorithm demonstration</h1>
<p class="abstract">
The first demo demonstrates the SOM algorithm in a nutshell. When the
Self-Organizing Map algorithm controls a row of sliders, they
gradually become ordered when random inputs are presented.
</p>
In this demo a one-dimensional map is represented by a row of sliders.
The sliders, representing map units, are controlled by the SOM
algorithm. When random inputs are presented, the sliders's values
gradually become ordered. During training the difference between the
previous and the new value of a slider is shown with yellow
color after each training step. Also the best matching unit, the
slider whose value is closest to the input value, is indicated with a
red slider. The leftmost slider with pinkish background is the input
controller. It shows the input to the map at each step and it is also
used to select user-defined inputs. <p>
The map can be trained either automatically or manually. During
automatic training the map is presented with random inputs at a
constant rate. In manual training you can yourself select the input
used for training by clicking with the mouse on the input controller
(the leftmost slider with pinkish background) or you can press the
<b>SPACE</b> key to teach one step with a random input. <p>
Use the <b>START/STOP</b> button to start and stop the automatic
training. The <b>RANDOMIZE</b> button will set the values of the sliders to
random values. Use the text field to set the <i>alpha</i> learning
rate parameter. Map units are also editable with the mouse. <p>
<a href="demo1instr.html">More detailed information</a> about the
first demo is also available. But now, lets see that demo:
<hr>
<a name="applet"></a>
<table>
<tr>
<td align=center valign=center hspace=8 vspace=8>
<APPLET CODE="SOMDemo1.class" ARCHIVE="somdemo.jar" WIDTH=300 HEIGHT=200>
<PARAM NAME=IPS VALUE=5>
<PARAM NAME=UNITH VALUE=150>
<PARAM NAME=UNITS VALUE=8>
<PARAM NAME=ALPHA VALUE="0.5">
<PARAM NAME=MAXALPHA VALUE="0.8">
<strong>
Java SOM applet not started. Possibly Java has been turned off or
your browser doesn't support Java applets...
</strong>
</APPLET>
</td><td align=left valign=top>
<ul>
<li><strong>START/STOP</strong> button start or stop automatic training
<li><strong>RANDOMIZE</strong> button randomizes the map
<li><strong>Alpha</strong> textfield sets <i>alpha</i>, the
learning rate (remember to press Enter/Return)
<li><strong>SPACEBAR</strong> trains one step with a random input.
<li><strong>Click mouse on input vector (leftmost, pinkish)</strong>
to teach one step with user-selectable input
<li><strong>CURSOR UP/DOWN</strong> increase/decrease automatic
training rate
<li>You can also edit the values of the map vectors with the mouse.
<li><a href="demo1instr.html">More information</a>
</ul>
</td></tr>
</table>
<hr>
When you are done with this demo, you can go to the
<a href="demo2.html"><i><b>second demo</b></i></a>.
<footer>
<div>
*
<a href="index.html"><strong>Demo Index</strong></a>
*
<a href="http://www.cis.hut.fi/nnrc/index.html"><strong>Neural Networks Research Centre</strong></a>
*
</div>
<div>
<!-- hhmts start -->
Last modified: Wed Sep 29 19:39:41 1999
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</div>
</footer>
</body></html>