Feed forward neural networks with activation function. This type of networks is represented as by one layer, as by multi layer networks, which don't have recurrent connections - information flaws in these networks from inputs to outputs passing all layers of neural network only one time without doing loops. Neurons of such networks calculate their output by calculating weighted sum of their inputs and passing it to activation function, which value becomes an output of neuron. With the ability to set activation function to use in neural network and configure it size, it is possible to creates different type of networks for different tasks starting from simple perceptron (neuron with threshold activation function), which does classification of linearly separable data into two classes, and ending with complex multi layer networks, which are aimed for recognition, prediction, et