Added sparseAutoencoderCost.cu file. An early implementation of the cost and gradient computation function used for backpropagation.
Added sparseAutoencoderCost.cu file. An early implementation of the cost and gradient computation function used for backpropagation.

cNikolaou/cuSAE,cNikolaou/cuSAE,cNikolaou/cuSAE,cNikolaou/cuSAE