稀疏\checkNumericalGradient.m ....\computeNumericalGradient.m ....\display_network.m ....\initializeParameters.m ....\normalizeData.m ....\sampleIMAGES.m ....\sigmoid.m ....\sigmoidInv.m ....\simpleQuadraticFunction.m ....\sparseAutoencoderCost.m ....\train.m 稀疏