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assets/src/DL/DL.0.6.md

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@@ -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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