Adam Optimization Algorithm

曾经多次看到别人说起，在选择Optimizer的时候默认就选Adam。这样的建议其实比较尴尬，如果有一点科学精神的人，其实就会想问为什么，并搞懂这一切，这也是我开这个Optimizer系列的原因之一。前面介绍了Momentum，也介绍了RMSProp，其实Adam就是二者的结合，再加上偏差修正(Bias Correction)。

首先，在Adam算法迭代过程中，需要计算各个时刻梯度的Exponential Moving Average，这一步骤来源于Momentum算法：

第二，计算各个时刻梯度平方的Exponential Moving Average，这一步骤来源于RMSProp算法：

第三步，分别对二者最Bias Correction：

最后，将算法合并：

原文地址：https://www.cnblogs.com/rhyswang/p/9307255.html

时间： 2024-11-06 13:40:55

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