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Update table 2.12.8
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jingwen-z committed Jul 12, 2019
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The table below briefly compares the difference between stochastic gradient descent (SGD), batch gradient descent (BGD), small batch gradient descent (mini-batch GD), and online GD:

|| BGD | SGD | Mini-batch GD | Online GD |
|:----:|:---:|:-------------:|:---------:|
|:--:|:----:|:---:|:-------------:|:---------:|
| training set | fixed | fixed | fixed | real-time update |
|Single iteration sample number | Whole training set | Single sample | Subset of training set | According to specific algorithm |
| Algorithm Complexity | High | Low | General | Low |
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2 changes: 1 addition & 1 deletion ch02_机器学习基础/第二章_机器学习基础.md
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​ 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|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|
|算法复杂度|||一般||
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