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AI Techs :: Very Simple Artificial Neural Network Example in C++

In this post, we will try to explain how to simulate a very simple artificial neural network in C++ and this is a good introduction to Artificial Intelligence Technologies. Artificial Intelligence is being widely explained well in Computer Science and many other disciplines, when we search simple examples in C++ it is really hard to find simple examples. The main aim of this post is to give an AI example in C++ as simple as possible and this post is also a good example of an introduction to Neural Network (ANN).

Very Simple Artificial Neural Network Example in C++

Here below we prepared a a very simple Artificial Neural Network example with an Activation Function given,

In this ANN example we have 2 input neurons and one output neuron. Neuron 0 and Neuron 1 are connected with Neuron 2. Each neuron will have their activation value (a) and each of the links between neurons will have weights. So output neuron will be the result of activation of the sum of 2 input neuron activations multiplied in their weights.

Output of the neuron may have a value in this current state. We should calculate it’s new activation value by the activation function phi(). Let’s define a simple linear activation function

Here we assume that our network was trained before, that means weights of net links are known. Let’s define and initialize our all neural activation and weight values,

Note that, the number of neural net links are not same with number of neurons. That means, links and weights can be handled in another array. We defined a2 before and we set it to 0 which is not correct in this network, our ANN should be stable, correct ! So we need to calculate the activation value of the output with these inputs. We should use our activation function with the sum of incoming signals in their weights.

As you see, this simple equation shows that activation value of an artificial neuron depends on activation values of input neurons and weights of input links.

We think that, this example above was the simplest artificial neuron and ANN example in C++ on the internet. It is good to understand how a simple neuron simulation works. Let’s sum all in this full example below,

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About author

Dr. Yilmaz Yoru has 35+ years of coding with more than 30+ programming languages, mostly C++ on Windows, Android, Mac-OS, iOS, Linux, and some other operating systems. He was born in 1974, Eskisehir-Turkey, started coding in college and graduated from the department of Mechanical Engineering of Eskisehir Osmangazi University in 1997. He worked as a research assistant at the same university for more than 10 years. He received his MSc and PhD degrees from the same department at the same university. Since 2012, he is the founder and CEO of Esenja LLC Company. He has married and he is a father of a son. Some of his interests are Programming, Thermodynamics, Fluid Mechanics, Artificial Intelligence, 2D & 3D Designs, and high-end innovations.
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