神经网络学习，基于matlab仿真，机器学习相关知识-ex4.m- Octave scr ipt that will help step you through the exercise

ex4data1.mat- Training set of hand-written digits

ex4weights.mat- Neural network parameters for exercise 4

submit.m- Submission scr ipt that sends your solutions to our servers

submitWeb.m- Alternative submission scr ipt

displayData.m- Function to help visualize the dataset

fmincg.m- Function minimization routine (similar to fminunc)

sigmoid.m- Sigmoid function

computeNumericalGradient.m- Numerically compute gradients

checkNNGradients.m- Function to help check your gradients

debugInitializeWeights.m- Function for initializing weights

predict.m- Neural network prediction function

[?] sigmoidGradient.m- Compute the gradient of the sigmoid function

[?] randInitializeWeights.m- Randomly initialize weights

[?] nnCostFunction.m- Neural network cost function