File list (Check if you may need any files):
mlclass-ex4-jin
...............\checkNNGradients.m
...............\computeNumericalGradient.m
...............\debugInitializeWeights.m
...............\displayData.m
...............\ex4.m
...............\ex4.pdf
...............\ex4data1.mat
...............\ex4weights.mat
...............\fmincg.m
...............\nnCostFunction.m
...............\predict.m
...............\randInitializeWeights.m
...............\sigmoid.m
...............\sigmoidGradient.m
...............\submit.m
...............\submitWeb.m
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