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Update 第二章_机器学习基础.md

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AutuanLiu 2018-11-15 21:48:36 +08:00
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@ -579,7 +579,7 @@ TODO
### 2.12.8 各种梯度下降法性能比较
下表简单对比随机梯度下降(SGD)、批量梯度下降（BGD）、小批量梯度下降（mini-batch GD）、和online GD的区别，主要区别在于如何选取训练数据：
|BGD|SGD|Mini-batch GD|Online GD|
|BGD|SGD|GD|Mini-batch GD|Online GD|
|:-:|:-:|:-:|:-:|:-:|:-:|
|训练集|固定|固定|固定|实时更新|
|单次迭代样本数|整个训练集|单个样本|训练集的子集|根据具体算法定|