文档介绍：基于局部权值阈值调整的BP算法的研究
刘彩红作者简介:刘彩红(1980-),女,陕西人,硕士研究生,研究方向为人工神经网络及其应用。Email: rainbow_dd@手机:1360 925 0662;
(西安工业大学北方信息工程学院,西安)
摘要:(目的)本文针对BP算法收敛速度慢的问题,提出一种基于局部权值阈值调整的BP算法。(方法)该算法结合生物神经元学忆形成的特点,针对特定的训练样本,只激发网络中的部分神经元以产生相应的输出,而未被激发的神经元产生的输出则与目标输出相差较大,那么我们就需要对未被激发的神经元权值阈值进行调整。所以本论文提出的算法是对局部神经元权值阈值的调整,而不是传统的BP算法需要对所有神经元权值阈值进行调整,(结果)通过实验表明这样有助于加快网络的学习速度。
关键词:BP神经网络,学习算法,距离,权值阈值调整
The Study of BP Algorithm Based on a Partial Adjustment of Weight and Threshold Value
LIU Cai-hong
(Xi’an Technological University North Institute of Information Engineering ,Xi’an China)
Abstract:The paper proposed a BP algorithm based on a partial adjustment of the weight and threshold value. According to the characteristics of biological neuron in learning and memory formation, only some neurons were stimulated to produce the output for the specific training samples, while the other part of the neurons weren’t stimulated. There are large difference between this part of the neuron’s output and target, and then we need this part neurons weight and threshold value to adjust. Therefore the algorithm proposed in this paper only adjust the weight and the threshold value of the local neurons, and this can accelerate the learning speed of work.
Keywords: BP work, Learning Algorithm, , Distance, Weight and Threshold Adjustment
1 引言
传统BP(Back Propagation)算法的性能依赖于初始条件,学习速度慢,学习过程易陷入局部极小。近年来,人们根据实际应用的需要对传统