[Neural Networks] Momentum
一、目的
加快参数的收敛速度。
二、做法
另第t次的权重更新对第t+1次的权重更新造成影响。

从上式可看出,加入momentum后能够保持权重的更新方向,同时加快收敛。通常alpha的取值为[0.7, 0.95]
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