人工神经网络是由大量的简单基本元件——神经元相互联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，但大量神经元组合产生的系统行为却非常复杂。-Artificial neural network is composed of a large number of simple basic components- made ​ ​ of neurons coupled to each other adaptive nonlinear dynamic systems. Structure and function of each neuron is relatively simple, but the combination of system behavior resulting large number of neurons is very complex.