MNIST資料集下載：http://yann.lecun.com/exdb/mnist/進網站後點擊紅色的連線就可以下載了。 function [I,labels,I_test,labels_test] = readMNIST(num)%讀取MNIST資料集，這個RTFSC %readMNIST MNIST handwriten image database reading. % % Syntax % % [I,labels,I_test,labels_test] = readMNIST(num) % % Description % Input: % id - cell array of images 28x28 size % n - number of images to process % labels - cell array of labels, corresponding to images % rand_on - parameter, defining if it is necessary to randomly pick a % pairs of image/label % Output: % I - cell array of training images 28x28 size % labels - vector of labels (true digits) for training set % I_test - cell array of testing images 28x28 size % labels_test - vector of labels (true digits) for testing set % %© Sirotenko Mikhail, 2009 %===========Loading training set

%Check if we have MNIST dataset

path = ‘./MNIST/train-images.idx3-ubyte’; %path = ‘D:/MatLab/MatLab/work/CNN/LeNet5-MNIST-master/MNIST/train-images.idx3-ubyte’; if(~exist(path,‘file’)) error(‘Training set of MNIST not found. Please download it from http://yann.lecun.com/exdb/mnist/ and put to ./MNIST folder’); end fid = fopen(path,‘r’,‘b’); %big-endian magicNum = fread(fid,1,‘int32’); %Magic number if(magicNum~=2051) display(‘Error: cant find magic number’); return; end imgNum = fread(fid,1,‘int32’); %Number of images rowSz = fread(fid,1,‘int32’); %Image height colSz = fread(fid,1,‘int32’); %Image width

if(num<imgNum) imgNum=num; end

for k=1:imgNum I{k} = uint8(fread(fid,[rowSz colSz],‘uchar’)); end fclose(fid);

%============Loading labels path = ‘./MNIST/train-labels.idx1-ubyte’; if(~exist(path,‘file’)) error(‘Training labels of MNIST not found. Please download it from http://yann.lecun.com/exdb/mnist/

if(num<itmNum) itmNum=num; end

labels = uint8(fread(fid,itmNum,‘uint8’)); %Load all labels

fclose(fid);

%============All the same for test set %path = ‘./MNIST/t10k-images.idx’; path = ‘./MNIST/t10k-images.idx3-ubyte’; if(~exist(path,‘file’)) error(‘Test images of MNIST not found. Please download it from http://yann.lecun.com/exdb/mnist/ and put to ./MNIST folder’); end

fid = fopen(path,‘r’,‘b’); magicNum = fread(fid,1,‘int32’); if(magicNum~=2051) display(‘Error: cant find magic number’); return; end imgNum = fread(fid,1,‘int32’); rowSz = fread(fid,1,‘int32’); colSz = fread(fid,1,‘int32’);

if(num<imgNum) imgNum=num; end

for k=1:imgNum I_test{k} = uint8(fread(fid,[rowSz colSz],‘uchar’)); end fclose(fid);

%============Test labels path = ‘./MNIST/t10k-labels.idx1-ubyte’; if(~exist(path,‘file’)) error(‘Test labels of MNIST not found. Please download it from http://yann.lecun.com/exdb/mnist/ and put to ./MNIST folder’); end

fid = fopen(path,‘r’,‘b’); magicNum = fread(fid,1,‘int32’); if(magicNum~=2049) display(‘Error: cant find magic number’); return; end itmNum = fread(fid,1,‘int32’); if(num<itmNum) itmNum=num; end labels_test = uint8(fread(fid,itmNum,‘uint8’));

fclose(fid);