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lines changed Original file line number Diff line number Diff line change @@ -94,4 +94,4 @@ layer-wise unsuperwised pre-training(逐层非监督预训练)。
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降噪自编码器(Stacked Denoising Autoencoders)核心思想是,一个能够从中恢复出原始信号的表达未必是最好的,能够对“被污染/破坏”的原始数据编码、解码,然后还能恢复真正的原始数据,这样的特征才是好的。
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- 假设原始数据x被我们“故意破坏”,比如加入高斯白噪,或者把某些维度数据抹掉,变成了<img width =" 50 " align =" center " src =" ../../images/374.jpg " />,然后再对<img width =" 50 " align =" center " src =" ../../images/374.jpg " />编码、解码,得到恢复信号<img width =" 50 " align =" center " src =" ../../images/395.jpg " />,该恢复信号尽可能逼近未被污染的数据x。此时,监督训练的误差从<img width =" 50 " align =" center " src =" ../../images/396.jpg " />变成了<img width =" 50 " align =" center " src =" ../../images/397.jpg " />。
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+ 假设原始数据x被我们“故意破坏”,比如加入高斯白噪,或者把某些维度数据抹掉,变成了<img width =" 20 " align =" center " src =" ../../images/374.jpg " />,然后再对<img width =" 50 " align =" center " src =" ../../images/374.jpg " />编码、解码,得到恢复信号<img width =" 20 " align =" center " src =" ../../images/395.jpg " />,该恢复信号尽可能逼近未被污染的数据x。此时,监督训练的误差从<img width =" 100 " align =" center " src =" ../../images/396.jpg " />变成了<img width =" 100 " align =" center " src =" ../../images/397.jpg " />。
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