BP神经网络，包括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。-BP neural network，By a large number of simple basic components- neurons interconnected by adaptive nonlinear dynamic systems. The structure and function of each neuron is relatively simple, but a large number of neurons in combination to produce the system behavior is very complex.