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疑问:P68 章节3.4 算法3.3 #633

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zzgnb opened this issue Sep 12, 2023 · 3 comments
Open
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疑问:P68 章节3.4 算法3.3 #633

zzgnb opened this issue Sep 12, 2023 · 3 comments

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@zzgnb
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zzgnb commented Sep 12, 2023

算法3.3 参数更新的符号问题

image

  • 疑问:加号是否应为减号
    这里个人觉得应该是减号,否则使用梯度下降的话,梯度为(预测-label),损失函数就变成(预测-label)*W,恒小于0,正确率越高则loss越趋近于0(loss越大),不符合梯度下降结果。
    此外在证明广义感知器收敛性上界中无法放缩(也是在做题时才发现这个问题):
    image
    因为
    image
    若为图中所示加号,则最后一项恒大于0,是无法放缩到下一步的,因此只有在减号情况下才可以放缩
@Faith-Uchiha
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Faith-Uchiha commented Sep 12, 2023 via email

@jacob240618
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jacob240618 commented Sep 12, 2023 via email

@xiaomeng2345
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xiaomeng2345 commented Sep 12, 2023 via email

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