what purpose do auto encoders do why do we need sparsity for auto encoders? what is the purpose of sparsity in neural networks? why do we need sparsity for auto encoders why do we need sparsity why do we need sparsity auto encoders? what is the sparsity of autocoders what is the purpose of auto encoder why we need sparsity why do auto encoders need sparsity why use autoencoder for auto-encoding why is sparsity important for auto encoders and neural networks? why do we need sparsity why do auto encoders need sparsity why do we need sparsity for auto encoders why do we need sparsity for auto encoders why does auto encoders need sparsity when to use sparsity why is sparsity a useful feature in neural networks how are auto encoders used