目录
* PCA V.S. Auto-Encoders
<https://www.cnblogs.com/nickchen121/p/11073131.html#pca-v.s.-auto-encoders>
* Denoising AutoEncoders
<https://www.cnblogs.com/nickchen121/p/11073131.html#denoising-autoencoders>
* Dropout AutoEncoders
<https://www.cnblogs.com/nickchen121/p/11073131.html#dropout-autoencoders>
PCA V.S. Auto-Encoders
* deep autoencoder由深度神经网络构成,因此降维效果丢失数据少
* 左pca;右auto-encoder
Denoising AutoEncoders
Dropout AutoEncoders
* 训练阶段不依赖所有神经元的输入
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