In this model, back propagation algorithm based on forward networks was conducted to learn information of historical data and to train the network weights.

以人工神经网络的前馈型网络为基础结构，基于反向传播算法进行学习和训练来拟和证券价格指数的运动趋势。

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In order to describe Internet worm propagation, a novel subsection model of network worm propagation was put forward.

为了更好地表达网络蠕虫传播情况，提出了一种新的蠕虫传播分段模型。

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The I/O relationship of back propagation algorithm (BP algorithm) for Feed-Forward Multi-layered Neural Network is a mapping relationship, which can resolve the above nonlinear problem.

多层前向神经网络的误差逆传播算法（简称BP算法）的输入输出关系实际上是一种映射关系，适于解决上述非线性映射问题。

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