BP网络“过拟合”现象的测不准关系中过拟合参数P的确定

Determination of over - fit parameter p in uncertainty principle of BP network"over - fit" phenomenon

BP网络建模过程中,出现“过拟合”现象时网络学习能力与推广能力之间满足一般测不准关系。测不准关系 式中的过拟合参数P的确定将有助于避免出现“过拟合”现象。本文给出了寻找过拟合参数P的一种方法,通过实际 应用,分析计算得到的P值进一步缩小了其可能存在范围。

The relation between the study ability and the popularization ability of network at appearance of 'over - fit' phenomenon during the construction of BP network model meets the uncertainty principle. The determination of over - fit parameter p in uncertainty principle contributes to avoid the appearance of 'over - fit' phenomenon. The paper gives one method for seek the over - fit parameter p. the practice makes known that the obtained p reduces the possible range.