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Drawing a graph

Visualising neural networks gives insight on which node have a larger effect on the output. And especially in evolving neural networks, it shows the characteristics of an ideal network. Setting up a graph is fairly easy:

Index.html

The html file should include d3v3 and webcola. Ofcourse you should also provide the neataptic.js file and the graph.js file from above. This is an example of the html file:

<html>
  <head>
    <script src="libs/d3v3.js"></script>
    <script src="libs/webcola.js"></script>

    <script src="/libs/neataptic.js"></script>
    <script src="/libs/graph.js"></script>
 
    <script src="script.js"></script>
    
    <link rel="stylesheet" type="text/css" href="/libs/graph.css">
  </head>
  <body>
    <div class="container">
      <div class="row">
        <svg class="draw" width="1000px" height="1000px"/>
      </div>
    </div>
  </body>
</html>

Script.js

If you want to work from a script, make sure to use the jquery $( document ).ready() function. Drawing the graph looks something like this then:

// Global var
var network;

$( document ).ready(function() {
  network = new neataptic.Architect.Perceptron(2, 10, 6, 5, 35, 1);
  drawGraph(network.graph(1000, 1000), '.draw');
});

You can draw a graph using:

drawGraph(data, dom_element);

Retrieve your networks graph:

var data = myNetwork.graph(width, height);

Graph.js

In the graph.js file, make sure to set the WIDTH and HEIGHT to the desired amount.

[...]
var NODE_RADIUS = 7;     // radius of circles on graph
var REPEL_FORCE = 10;    // force power between circles
var LINK_DISTANCE = 100; // length of a connection

var WIDTH = 1000;        // width of your graph
var HEIGHT = 500;        // height of your graph
[...]

Graph.css

Make sure to include graph.css in your html file. This makes sure your connections are visible and makes the nodes more eye-appealing.

Disable constraints

Normally graphs look like the network on the left. If you want a more fluid design, disable constraints, and you'll get a graph like on the right:

In graph.js, remove line 60:

.constraints(graph.constraints) // remove this line

This basically makes the input and output nodes less distinguishable.