When the hidden layers are larger than the input layer, an autoencoder can potentially learn the identity function and become useless; however, experimental results have shown that such autoencoders might still learn useful features in this case.
An autoencoder can potentially learn the identity function. An autoencoder can potentially become useless. The hidden layers are larger than the input layer. Such autoencoders might still learn useful features in this case. Experimental results have shown this. This was however.