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线性回归的梯度下降算法bug很严重 #1

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btobab opened this issue Aug 20, 2021 · 6 comments
Open

线性回归的梯度下降算法bug很严重 #1

btobab opened this issue Aug 20, 2021 · 6 comments

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@btobab
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btobab commented Aug 20, 2021

  1. dw的方向有问题
  2. 精度很低
@zhulei227
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你好，多谢第一个提问；
1.dw的方向是什么问题？【那结果为啥又会收敛呢？】
2.如果确认不了【1】的问题，【精度很低】的依据又是什么？

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@zhulei227
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你好，多谢第一个提问；
1.dw的方向是什么问题？【那结果为啥又会收敛呢？】
2.如果确认不了【1】的问题，【精度很低】的依据又是什么？

@btobab
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btobab commented Aug 27, 2021

很抱歉，是我的问题。我没有注意到您的dw的公式中将负号提出去了，导致我的梯度正好是相反的。十分抱歉～～

@btobab
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btobab commented Aug 27, 2021

另外能再请教您一个问题吗？
在线性回归任务中，我在数据预处理时加了归一化，那么梯度下降算法求解出的w是否需要逆归一化？以及如何逆归一化？

@privateos
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逻辑回归梯度下降法有错误。

@privateos
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看错了，没问题😁

zhulei227 pushed a commit that referenced this issue May 2, 2023
@Mattzic
Merge pull request #1 from zhulei227/master
ff681ab 
修复公式错误
zhulei227 added a commit that referenced this issue May 2, 2023
@zhulei227
Merge pull request #4 from Mattzic/master
df90c37 
Merge pull request #1 from zhulei227/master
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@zhulei227 @privateos @btobab