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Merge pull request #327 from CoderOverflow/patch-11 

2.12.7 各种梯度下降法性能比较 内容修订
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### 2.12.7 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：
|BGD|SGD|GD|Mini-batch GD|Online GD|
||BGD|SGD|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|