Great post by Gordon Linoff the the Data Miners.com Blog about visualising Neural Networks
I usually get better predictive success using neural nets, but the lack of explain-ability is always a downside. I'm always keen to see ways that might help explain or interpret a Neural Network. A few years ago I tried a simple graphical way to show a Neural Net, but I think Gordon's recent post highlights better options.
My example is written in VB.NET and parses a single hidden layer Neural Network saved as PMML into data grids. Once the neural net neurons and weights are loaded into the data grids I then read from the data grids and create a graphic of the Neural Net. Transparency is used to show the strength of the weight, whilst colour (blue or red) is used to show the negative or positive effect) . You can view my example at;
and download the source code, executable and example PMML directly from here;
I can't post images as comments on Gordon's blog so below are two snapshots of the simple UI application that displays the Neural Net PMML graphic.
b) PMML loaded into data grids