一、实验要求
采用三层前馈BP神经网络实现标准人脸YALE数据库的识别，编程语言为C系列语言。
二、BP神经网络的结构和学习算法
实验中建议采用如下最简单的三层BP神经网络，输入层为 ，有n个神经元节点，输出层具有m个神经元，网络输出为 ,隐含层具有k个神经元，采用BP学习算法训练神经网络。
BP神经网络的结构
BP网络在本质上是一种输入到输出的映射，它能够学习大量的输入与输出之间的映射关系，而不需要任何输入和输出之间的精确的数学表达式，只要用已知的模式对BP网络加以训练，网络就具有输入输出对之间的映射能力。
BP网络执行的是有教师训练，其样本集是由形如（输入向量，期望输出向量）的向量对构
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