Also the method of descent should be clearly stated where lower-offs are not provided.

同时，对下降方式的说明中须著明何处未设下降点。

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Cause: Some part of the code is descending two levels per method call without dispatching appropriately on the second descent.

起因：代码的某些部分在每次方法调用中下行了两级且第二次下行时调度不当。

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This paper studies BP network, realizes the method of gradient descent, gets better result than traditional one.

本文研究了BP网络，实现了“梯度下降法”的网络训练方法，获得了较传统方法好的效果。

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