神经网络是由大量简单的基本元件—神经元相互连接而成的自适应非线性动态系统。每个神经元的结构和功能比较简单，而大量神经元组合产生的系统行为却非常复杂。-Neural network is a large number of simple basic components- made of neurons interconnected adaptive nonlinear dynamic systems. Each neuron structure and function of relatively simple, while the combination of a large number of neurons resulting system behavior is very complex.